JP2959975B2 - Oil purification method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for purifying an oil mainly for removing and purifying oily substances such as edible oil.

[0002]

2. Description of the Related Art For example, when edible oil is repeatedly used for cooking tempura, etc., scum and elution components of the food to be cooked are mixed in, and the oil is gradually contaminated by degraded components due to oxidation of the oil itself. . Severely contaminated oil was drained into the sewage as it was.In recent years, it has been disposed of as garbage by solidifying it with resin or absorbing it with a cotton or sponge-like oil absorber. ing. In addition, used oil is filtered with a paper filter or the like to remove scum and the like, and is reused.

[0003]

It is not preferable in terms of environmental protection to drain used oil into sewage or the like, since it pollutes rivers and the sea and clogs sewage pipes. On the other hand, in a method of solidifying oil with a resin or the like and discarding it as garbage, the entire oil is wasted and is uneconomic.

[0004] Further, in the method of removing waste contained in oil with a paper filter or the like and reusing the same, a dirt substance such as protein dissolved in food and dissolved in oil or fine dirt which passes through the filter eyes is used. There is a disadvantage that particles cannot be removed.

An object of the present invention is to provide a method and an apparatus for purifying an oil, which can remove a contaminated substance of used oil at a high level and quickly, and can purify and regenerate even highly contaminated oil.

[0006]

In order to solve the above-mentioned problems, the oil purification method of the present invention comprises a step of bringing moisture-containing inorganic substance powder into contact with a high-temperature oil; The method includes a step of trapping and removing the dirt substance by the inorganic substance powder, and a step of separating the inorganic substance powder and the oil purified by removing the dirt substance and collecting the purified oil.

[0007] The oil to which the present invention is applied is mainly an edible oil in which fouling and the like have been reduced due to contamination by contamination with cooking of fries and tempura, and is used for cutting, washing, lubrication and the like. It is also applicable to the purification of oil other than edible oil such as dirty machine oil. In the case of edible oils, for example, in the case of edible oils, the contaminant components include sludge from the food itself, leaches from the food such as protein and odor components, and altered components due to oxidation of the oil itself.

[0008] The inorganic substance powder may be any substance as long as it can contain moisture and does not easily decompose or dissolve even when it comes into contact with high-temperature oil.
Or natural minerals containing water by incorporation into powder particles in the form of water of crystallization or the like, or purified and powdered minerals, and inorganic substances having a composition or structure similar to those minerals Can be artificially synthesized and powdered.

Among them, various clay minerals containing hydrous aluminum silicate as a main component and purified products thereof (hereinafter, simply referred to as clay minerals) are particularly preferably used in the present invention. , Montmorillonite, bentonite, kaolinite, halloysite, pyrophyllite, sericite, chlorite, illite and the like, and purified products thereof can be used.
Further, plural kinds of various clay minerals can be used in combination. Further, synthetic inorganic substances having compositions or crystal structures similar to those of the above-mentioned various clay minerals can also be used. As such a synthetic inorganic substance, for example, synthetic smectite (for example, product name: Smecton, Kunimine Kogyo Co., Ltd.) is excellent in the adsorption performance of contaminants and can be suitably used in the present invention.

[0010] For example, in the case of edible oil, the oil is brought into contact with the above-mentioned inorganic substance powder in a high temperature state such as after cooking, and the oil whose temperature has dropped is heated in advance by a heater or the like. The dirt component in the oil is physically or chemically adsorbed on the surface thereof by contact with the powder particles, or is trapped by being taken in, and is removed from the oil. At this time, the moisture of the inorganic substance powder evaporates as steam due to the heat of the oil, and a large amount of steam bubbles are generated in the oil. When the air bubbles escape to the outside, the oil is vigorously stirred with the inorganic substance powder, so that the contact efficiency between the oil and the surface of the powder particles is enhanced, and the inorganic substance powder captures the contaminants, thereby purifying the oil. Will proceed promptly. Also, dirt components that cannot be removed by the filter, such as odor components, are removed neatly, and even heavy oil can be regenerated, so that environmental pollution due to oil drips is not caused and is economical. . here,
The temperature of the oil is adjusted within a range in which the evaporation of the water contained in the powder sufficiently proceeds and the oil itself does not smoke or undergo thermal deterioration. For example, in the case of edible oil, it is about 100 to 220 ° C., preferably. The temperature is adjusted to about 130 to 200 ° C.

When the capture of the contaminants in the oil by the inorganic substance powder is completed, the purified oil is filtered by a filter such as paper, cloth, ceramic, or the like, or separated by separation means using sedimentation, centrifugation, or the like. Separated from powder and collected.

The amount of water contained in the inorganic substance powder is appropriately selected in consideration of the state and amount of dirt of the oil to be brought into contact. For example, in the case of clay mineral, it is preferably about 3 to 15% by weight. desirable. If the water content is too small, the amount of water that evaporates is small, and the oil is not sufficiently stirred and thus purified. On the other hand, if the water content is too large, the relative content of the inorganic substance in the powder decreases, so that the efficiency of capturing the dirt substance decreases, and the amount of generated steam increases, which may cause problems such as oil scattering. Not preferred.

[0013] The lower limit of the particle size of the inorganic substance powder is, for example, when the powder is separated from oil by a filter or the like, a large amount of fine powder particles pass through the eyes of the filter, or the sinking speed of the powder particles in the oil. Is set so that the separation efficiency of the oil and the powder does not decrease due to excessively small value. On the other hand, the upper limit of the particle size is within a range where the contact area between the particle surface and the oil does not become too small.
As a result, it is set within a range where the oil purification efficiency does not decrease.
In other words, the average particle size or the particle size distribution is appropriately set in consideration of the roughness of the filter used, the pressure of oil passing through the filter, the type of powder, the ability to remove dirt, and the like.

When a natural clay mineral is used, it is desirable to purify and remove unnecessary components as much as possible. For example, clay minerals with a normal degree of refining contain undesired components, such as arsenic and heavy metals, that are mixed with food, and when applied to edible oils, raise the degree of refining and remove them sufficiently. It is desirable to keep. Here, when the above components cannot be sufficiently removed by a usual method, it is also effective to use a synthetic product containing no such components instead of natural minerals.

On the other hand, in addition to clay minerals, various inorganic powders such as activated clay, diatomaceous earth, and activated alumina can be used. Further, by using them in a mixture with a clay mineral, a greater purification effect may be obtained. For example, by mixing purified smectite or bentonite with a certain amount of activated clay and diatomaceous earth, it is possible to obtain an inorganic substance powder having more excellent oil purification ability.

Various additives can be added to the inorganic substance powder as required. For example, when using a clay mineral, for example, by adding a magnesium-based flocculant containing magnesium oxide, magnesium hydroxide, or the like as a main component, the powder particles are aggregated to increase the sedimentation speed of the powder in oil. In addition, the separation efficiency between the purified oil and the powder can be increased. Further, for example, if an appropriate amount of a calcium-based additive containing calcium hydroxide or the like as a main component is added, soil substances such as proteins dissolved in the oil are removed by the adsorbing action of the additive, etc. Off-taste, coloring, and the like can be suppressed.

When the oil is edible oil, it is possible to use an inorganic substance powder containing an alkali component. When such an inorganic substance powder is used, it comes into contact with oil,
When the mixture is agitated, the alkaline component is transferred into the oil, so that the oil itself is oxidized and the acidic substances mixed in from the food are neutralized, thereby alleviating adverse effects such as generation of off-flavors and off-flavors. Further, since the oxidized oil component is reduced by the alkali component, the oil can be regenerated to a fresher state. Furthermore, since the oil itself is kept alkaline, oxidation of the treated oil is unlikely to proceed.

The alkaline component used is a component that can be ingested by the human body and at least partially migrates into the oil to make it alkaline (ie, to increase the pH to above 7). Then, it is desirable that the ingredient is hardly adversely affected such as reducing the flavor when transferred to food. Specifically, alkali components extracted from beans and grains such as soybeans are preferably used.

In order to efficiently carry out the oil purification method of the present invention, an oil purification apparatus including a purification tank for purifying oil, and a separation means for separating purified oil and inorganic substance powder is provided. Can be. In the septic tank, the inorganic substance powder containing water is held in the inside thereof, and at the same time, high-temperature oil is introduced to be purified by contact with the inorganic substance powder. The separation means
For example, a paper, cloth, a filter made of ceramics or the like to filter the inorganic substance powder, a substance that precipitates the inorganic substance powder, and recovers the supernatant as purified oil, and further includes a centrifugal separation mechanism. .

The separation means includes a separation tank into which a mixture of the inorganic substance powder and oil is introduced for separation, and a coarse tank through which oil passes but the inorganic substance powder does not pass through the internal space of the separation tank. A filtration filter partitioned by the filter, an introduction chamber formed on one side of the internal space partitioned by the filtration filter, and an oil mixed with inorganic substance powder is introduced from the purification tank, and the other side of the internal space. And a collection chamber in which the purified oil passes through the filtration filter while the inorganic substance powder is filtered off by the filtration filter, and is introduced and recovered from the introduction chamber side.

In this case, a hydraulic sending means such as a pump for sending oil from the introduction chamber side to the recovery chamber side can be provided. Thus, even if the inorganic substance powder that has been filtered off accumulates on the surface of the filter, the oil is pressurized toward the filter surface by the pumping means, so that the transmission efficiency of the oil to the filter, and thus the oil and the powder Separation efficiency is improved. In addition, the filter is cleaned by injecting gas such as air or cleaning oil from the collection chamber side to the introduction chamber side through the filtration filter to drop inorganic substance powder attached to the filtration filter to the introduction chamber side. Alternatively, a filter cleaning mechanism may be provided. Thereby, the clogged filtration filter can be easily cleaned.

Further, a sedimentation tank may be provided between the purification tank and the separation tank for sedimenting coarse particles of the inorganic substance powder particles mixed in the oil. Thereby, the amount of coarse powder introduced together with the oil into the separation tank is reduced, and clogging of the filter and the like are suppressed. Here, the term “particles having a coarse particle size” means secondary particles formed by agglomeration of fine primary particles.

The introduction chamber of the separation tank can be used also as a septic tank. Thereby, the separation means can be integrated with the septic tank, and the entire apparatus can be made compact.

On the other hand, the oil purifying apparatus of the present invention is provided with an introduction pipe communicating with a cooker for guiding the oil from the cooker to a purification tank and a separating means for purifying the oil from the fryer cooker. And a return line for returning the separated purified oil to the cooking device. According to this configuration, the oil in the cooking device is continuously purified while the cooking is continued, so that the food can always be cooked with the clean oil, and the trouble of changing the oil can be omitted.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the accompanying drawings. (Embodiment 1) FIG. 1 conceptually shows an apparatus for purifying oil by the method of the present invention. Oil purification device 1
Is for cleaning the purification tank 2, the precipitation tank 3, the pump 4 as a hydraulic sending means, the separation tank 6 provided with the filtration filter 5 therein, the collection tank 7 for collecting and storing purified oil, and the filtration filter 5. And the like.

The septic tank 2 supplies an oil inlet 9 for injecting high-temperature contaminated oil W1, a heater 10 for keeping heat, and an inorganic substance powder 11 such as clay mineral powder (hereinafter, also simply referred to as powder). The apparatus includes a powder supply means 12 such as a hopper, a stirrer 13 for auxiliary stirring, and the like. A discharge port 14 having an electromagnetic valve 15 is provided at a lower portion of the septic tank 2 so that a mixture of the oil W1 and the inorganic substance powder 11 in the septic tank 2 is discharged.

Next, the sedimentation tank 3 is connected to the outlet 14 of the septic tank 2.
And receives a mixture M of the oil W1 and the inorganic substance powder 11 from the septic tank 2. The inside of the settling tank 3 is divided into a plurality of, for example, two chambers 3 by a partition plate 3a.
b and 3c, the mixture is discharged to one of the chambers, for example, the chamber 3b side, and the oil W1 that has spilled over the partition plate 3a and overflowed to the chamber section 3c side,
It flows into the oil pipeline 16. The oil line 16 communicates with the inside of the separation tank 6, and the pump 4 is provided in the middle of the oil line 16. A discharge port 3d provided with a valve 3e is provided below the sedimentation tank 3, and a filter 3f and a tank 3g for receiving a discharge from the sedimentation tank 3 are arranged below the discharge port 3d.

The separation tank 6 is configured as a pressure vessel having a closed upper part, and one or more hollow filtration filters 5 are disposed therein. The wall portion (for example, the side wall portion and the bottom portion) of the filtration filter 5 has a roughness that allows the oil W1 to pass through but does not allow the inorganic substance powder 11 to pass therethrough. Alternatively, it is configured as a filter in which a cloth filter or the like is supported on the outside of a wire mesh, or as a filter wall of porous ceramic or the like. And
The filtration filter 5 divides the internal space of the separation tank 6 into two, and the outside of the filtration filter 5 is an introduction chamber 17 and the inside is a collection chamber 18. An outlet 6a provided with a valve 6b is provided below the separation tank 6, and a filter 6c and a tank 6d are arranged below the outlet 6a.

A collection pipe 19 communicates with a collection chamber 18 inside each filtration filter 6, and a lower end of the collection pipe 18 communicates with the oil collection side solenoid valve 2.
There is provided a discharge port 19 which is opened and closed by 0, and the recovery tank 7 is arranged below the discharge port 19. In addition, a filter 21 is provided at an outlet of the collection pipe 19.

The filter cleaning mechanism 8 communicates with a compressed air source 22 such as a compressor or the like at one end into a recovery pipe 19 and recovers the cleaning pipe 23 and the cleaning pipe 23 connected at the other end to the air source 22. A cleaning mechanism side solenoid valve 24 that opens and closes the pipe 19 is provided. On the other hand, an oil supply side solenoid valve 25 is provided at an outlet of the oil pipeline 16 connecting the sedimentation tank 3 and the purification tank 6. Further, a pressure detecting unit 26 such as a pressure sensor is provided in the separation tank 6, and is connected to the control unit 27 together with the solenoid valves 20, 24, 25, the pump 4, the compressed air source 22, and the like. When the pressure in the separation tank 6 detected by the pressure detection unit 26 is equal to or less than a predetermined value, the control unit 27 closes the cleaning mechanism side solenoid valve 24, and controls the oil supply side solenoid valve 25 and the oil recovery side solenoid valve 20. On the other hand, when the pressure exceeds a predetermined value, the oil recovery side and supply side solenoid valves 20 and 25 are closed, and the cleaning mechanism side solenoid valve 24 is opened. A return line 4a and a relief valve 4b are provided in a portion of the oil line 16 between the pump 4 and the oil supply side solenoid valve 25.

The method of purifying oil using the oil purifying apparatus 1 is as follows. First, high-temperature oil W1 such as dirty tempura oil is put into the purification tank 2 through the oil supply port 9, and the temperature is kept at a certain temperature or higher by the heater 10. When the inorganic substance powder 11 is supplied from the powder supply means 12 to the oil w1 kept warm, the inorganic substance powder 11 comes into contact with the oil W1 and evaporates moisture by its heat. The oil W1 in the septic tank 2 is vigorously stirred by the bubbles of water vapor accompanying the evaporation,
The dirt component in the oil W1 is captured and removed by the powder particles. At this time, with respect to the oil W1 using the auxiliary stirrer 13,
By performing additional stirring, the effect of removing the dirt component can be further promoted. The oil W1 may be stored in another tank (not shown) before being injected into the septic tank 2, where it is kept at a predetermined temperature by a heater or the like, and then introduced into the septic tank 2. In this case, septic tank 2
The heater 10 can be omitted.

Oil W mixed and stirred with inorganic substance powder 11
1 is discharged from the outlet 14 into the chamber 3b of the settling tank 3. Then, the coarse particles 11a of the inorganic substance powder 11 are settled, and the supernatant S overflows the partition plate 3a and overflows into the chamber 3c, and is further fed by the pump 4 to the separation tank 6 side. Here, the supernatant S is the oil 3 and the chamber 3
b contains fine particles of the powder 11 which did not precipitate. The coarse particles 11a settled in the settling tank 3 are:
It can be discharged from the discharge port 3d together with the oil W1.
At this time, the particles 11a are filtered off by the filter 3e, while the oil W1 is recovered in the tank 3g.

Next, the supernatant S introduced into the introduction chamber 17 of the separation tank 6 is forced together with the powder particles 11 onto the surface of the filter 5 by the pumping action of the pump 4 as shown in FIG. Pressed against. Thereby, the powder 11
Is filtered off on the surface of the filter 5 and the oil W
1 is transmitted through the filtration filter 5 and sent into the collection chamber 18, and is collected in the collection tank 7 through the collection pipe 19.
Here, the liquid sending pressure of the pump 14 varies depending on the roughness of the filter 5 and the degree of adhesion of the powder 11 to the filter 5. For example, the average roughness of the filter 5 is 5 μm.
When the pressure in the introduction chamber 17 is 5 to 15 kg / cm
It is desirable to set it to about ² . In addition, the filter 11 may be damaged, and the powder 11
When leaked to a, it is filtered by a filter 21 provided below the outlet 19.

As the separation of the oil W1 and the powder 11 progresses, the powder 11 adheres to the introduction chamber 17 side of the filter 5 as shown in FIG. The resistance increases and the pressure in the introduction chamber 17 increases. When the pressure detected by the pressure detection unit 26 shown in FIG. 1 exceeds a predetermined value, the control unit 27 stops the pump 4, closes the oil supply side solenoid valve 25 and the oil recovery side solenoid valve 20, and further releases the relief. The supply of the oil 1 to the separation tank 6 is stopped by opening the valve 4b. Next, the cleaning mechanism side electromagnetic valve 24 is opened, and the compressed air source 22 is operated. As a result, the high-pressure air is
It is injected into the collection chamber 18 via 3 and 19. As shown in FIG. 2B, the injected air L passes through the filtration filter 5 back to the introduction chamber 17 side, and blows the powder 11 attached to the surface of the filtration filter 5 to the introduction chamber 17 side. Is removed. In this way, the filter 5 is washed and the clogged state is eliminated, so that the efficiency of separating the oil W1 and the powder 11 can be increased. The blown powder 11 is collected at the bottom of the separation tank 6, and is collected from the discharge port 6a by opening the valve 6b appropriately.
At this time, the powder 11 is filtered off by the filter 6c.

If the inorganic substance powder 11 is repeatedly used for purifying oil, the amount of dirt substance trapped on the surface or inside of the particles gradually increases, and the purification ability decreases. In this case, the powder 11 may be replaced with a new one. However, the inorganic substance powder 11 collected in the filter 3f, 6c or the like is heated to a temperature at which it does not decompose itself (for example, 660 ° C. or less in the case of smectite or bentonite). )
If the trapped dirt is decomposed and removed, the powder 1
1 can be used again for purification of the oil 1.

In the above embodiment, the oil W1 is pumped to the separation tank 6 by the pump 4. However, the recovery line 1 is used together with or instead of the pump 4.
A suction pump may be provided on the side 9 to suction oil W1 so that the oil W1 is transmitted through the filter 5 and separated from the powder 11.

Further, the filter cleaning mechanism 8 injects cleaning oil instead of injecting a gas such as air to filter 5.
Can be cleaned. As shown in FIG. 3, an example of the cleaning tank 2 is provided in place of the compressed air source 22.
9 and a cleaning pump 30. The pump 30 injects the cleaning oil W2 in the tank 29 into the recovery chamber 18,
The filter 5 can be cleaned. Here, the separation tank 6
Is provided with a tank 31 together with a solenoid valve 32 for collecting the oil overflowing from the introduction chamber 17 with the inflow of the cleaning oil W2. The operations of the cleaning pump 30 and the opening / closing solenoid valve 32 are controlled by the control unit 27.

(Embodiment 2) FIG. 4 shows an example of the configuration of an apparatus in which an introduction chamber in a separation tank is also used as a purification tank. The oil purification device 51 includes an oil tank 54 for storing unprocessed oil W1, a separation tank 52 whose inside is partitioned by a filter 53 serving as separation means, and a recovery for collecting and storing purified oil W1 from a recovery chamber 58. Tank 55, filtration filter 53
And a filter washing mechanism 56 for washing the filter.

The oil tank 54 has an oil inlet 61 and a heater 62 for keeping the oil warm, and communicates with the separation tank 52 via an oil pipe 63. An oil supply pump 64 for feeding the oil W1 in the oil tank 54 to the separation tank 52 is provided in the middle of the oil pipe 63.
Is arranged.

The separating tank 52 is formed as a box-shaped or cylindrical container having a closed upper part, and has a hollow filter 5 having a side wall and a top surface formed as a filter at the bottom.
3 are arranged. The filtration filter 53 divides the internal space of the separation tank 52 into two, and the outside of the filtration filter 53 is an introduction chamber 57 also serving as a purification tank, and the inside is a collection chamber 58. An oil pipe 63 communicates with the introduction chamber 57, and oil W1 is supplied from the oil tank 54.
A powder supply device 60 is provided to supply the inorganic substance powder 11. A collection pipe 65 extends from the collection chamber 58 to communicate with the collection tank 55, and a filter 66 is provided at the outlet thereof.

In the present embodiment, the filter cleaning mechanism 56 injects the cleaning oil W2 into the collection chamber 58 and
3 is performed, and includes a cleaning tank 67 for storing the cleaning oil W2. The cleaning tank 67 is connected to the collection chamber 58 and the introduction chamber 5 by the pipes 68 and 70.
7 and a pipe 68 is provided with a cleaning pump 69 for injecting the cleaning oil W2 in the tank 67 into the collection chamber 58. Also, the pipe 70
Is provided with a powder recovery filter 71 at the outlet.
Here, a cleaning mechanism-side solenoid valve 72 is provided in both the pipes 68 and 70, while an oil supply-side solenoid valve 73 is provided at an outlet of an oil pipe 63 connecting the separation tank 52 and the oil tank 54, and The recovery pipe 65 is provided with an oil recovery-side solenoid valve 96. As in the first embodiment, when the pressure detected by the pressure detecting unit 74 provided in the separation tank 52 is equal to or lower than a predetermined value, the cleaning unit-side electromagnetic valve 7 is controlled by a control unit (not shown).
2 is closed and the oil supply side solenoid valve 73 and the oil recovery side solenoid valve 9
If the pressure exceeds a predetermined value while the valve 6 is opened, the open / close relationship of the solenoid valves 72, 73 and 96 is reversed.

The method of purifying oil using the oil purifying apparatus 51 is substantially the same as that of the first embodiment. However, the contaminated oil W1 is purified by contact with the powder 11 in the introduction chamber 57 also serving as a purifying tank. Becomes When the powder 11 adheres to the filtration filter 53 and the pressure in the introduction chamber 57 rises, the pressure detection unit 7
4 detects this, and the control unit stops the oil supply pump 64 and closes the oil supply side solenoid valve 73 and the oil recovery side solenoid valve 96. Next, the cleaning mechanism side electromagnetic valve 72 is opened, the cleaning pump 69 is operated, and the cleaning tank 67 is opened.
The washing oil W2 is sprayed into the collection chamber 58, and the powder 11 attached to the surface of the filter 53 is blown off to the introduction chamber 57 side. The blown powder 11 is introduced into the introduction chamber 5.
The oil W2 is discharged to the pipeline 70 together with the oil which has permeated into the inside 7 and is filtered off by the powder recovery filter 71 provided at the outlet thereof, and the oil W2 is recovered in the cleaning tank 67 and is re-used for the next cleaning. used.

Here, the filtration filter 53 is connected to the separation tank 52.
It may be formed in any form as long as it partitions the interior of the chamber into a plurality of chambers. As shown in FIG. 5, those formed in a partition shape can also be used. Further, a configuration in which the inside of the separation tank 52 is partitioned by a plurality of filtration filters 53 and one or both of the introduction chamber 57 and the collection chamber 58 are formed in plurals is also possible. FIG. 6 shows that the inside of the separation tank 52 is divided into three chambers by two sets of partition-shaped filtration filters 53, and one chamber at the center is an introduction chamber 57,
An example in which the chamber is a collection chamber 58 is shown.

The clogged state of the filtration filter 53 may be detected by detecting a rise in the pressure in the separation tank 52 by a pressure detector 74 such as a pressure sensor. It can also be detected by a surface sensor or a pressure sensor. In this case, the separation tank may be open at the top.

Separation tank 52, oil tank 54, recovery tank 5
5. The filter cleaning mechanism 56 and the like may be arranged in any manner. Further, the filter cleaning mechanism 56 is omitted, and the separation tank 5 is omitted.
It is also possible to adopt a configuration in which the filtration filter 53 in 2 is appropriately cleaned or replaced.

(Embodiment 3) FIGS. 7 and 8 show a more specific configuration example of an oil purification apparatus of Embodiment 2 (corresponding members and portions bear the same reference numerals as those of the apparatus 51 of Embodiment 2). Attached). The oil tank 54, the recovery tank 55 (FIG. 8), and the cleaning tank 67 of the oil purification device 100 are all formed in a box shape using steel plates or the like, and are adjacent to the key hand in plan view as shown in FIG. And is arranged on the base 75. A box-shaped separation tank 52 is supported above these tanks by a frame 76 erected on a base 75. The volume of the separation tank 52 is, for example, about 30 liters, but may be 60 to 100 liters for large-scale processing. Here, the bottom of the separation tank 52 may be formed in a funnel shape.

As shown in FIG. 7, a basket-shaped filter frame 5 is provided on the inner bottom of the separation tank 52.
A filtration filter 53 configured by supporting a cloth filter 53b from the outside on 3a is arranged.
The inside is a collection chamber 58. The reference numeral 77 inside the oil tank 54 is a liquid level sensor.

Also, as shown in FIG.
The cleaning pump 69 of the filter cleaning mechanism 3 and the filter cleaning mechanism 56 are arranged in parallel in an empty space in front of the cleaning tank 67 on the base 75. The pipes connecting the septic tank 52 and the tanks 54, 55, 67 are not shown. Further, as shown in FIG. 7, the inorganic substance powder 11 and the cleaning oil W discharged from the purification chamber 57 to the cleaning tank 67.
1 and the like directly fall into a funnel-shaped filter 71 provided on the upper part of the washing tank 67.

(Embodiment 4) FIG. 9 shows an example of the configuration of an apparatus for transporting oil using gravity. In the oil purification device 101 shown in FIG.
Are omitted, the oil tank 54 is arranged above the septic tank 2, and the recovery tank 55 is arranged below the septic tank 2.
The oil W1 flows into the purification tank 2 from the oil tank 54 by gravity, and the inorganic substance powder 11 supplied from the powder supply device 60 is supplied.
And is collected in the collection tank 55. The filtration filter 53 is provided on the upper part of the recovery tank 55, and directly receives the discharge from the septic tank 2 without passing through a pipe. That is, the collection tank 55 is also used as a separation tank. Further, since the oil is transported by gravity, a pump for pumping the oil is not included. Further, if the configuration is such that the inorganic substance powder 11 is manually charged into the separation tank 52, the powder supply device 60 can also be omitted.

(Embodiment 5) FIG. 10 schematically shows an example in which an oil purifying device having substantially the same configuration as that of Embodiment 1 is connected to a fryer cooker to continuously purify the oil in the cooker. Things. Tempura oil t filled in one or a plurality of fried food cookers f is heated by a heater b, and tempura (not shown) is sequentially cooked in these cookers f. The tempura oil t in the fryer f is sent to the purification tank 2 of the oil purification device 102 through the introduction line 78 by the pump q.
There, it is purified by contact with the inorganic substance powder. Hereinafter, the inorganic substance powder is separated from the oil W1 by the filter 5 in the separation tank 6 by the same mechanism as in the first embodiment.
The oil W1 collected in the tank 8 is returned to the deep-frying cooker f through the return line 79, and is collected in the tank 7 for collection.
Has been omitted. As a result, the tempura oil t becomes
Is continuously purified while circulating between the oil purification device 102 and the oil purification device 102, so that the tempura oil t in the cooking device f is always kept in a clean state.

(Embodiment 6) The oil purification method of the present invention can be carried out using a simple tool as shown in FIG. 11, for example, without using the apparatus having the above configuration. An oil receiving portion 81 having at least a bottom portion made of a net or a hole for liquid communication is placed on the oil collecting container 80, and a filter 82 made of paper or the like is spread on the inner surface thereof. Put body 11. Then, when hot oil W1 is poured from the pot 83 into the inorganic substance powder 11, the powder 11
Purifies the oil W1 while stirring it in the paper filter 82. The purified oil W1 passes through the paper filter 82, falls into the oil collecting container 80, and is collected. As shown in the drawing, the oil receiving portion 81 can be formed in a funnel shape by using, for example, metal or setomono.
A detachable container-shaped filter that is set on the inner surface of the container 1 can be provided.

Here, the inorganic substance powder 11 can be stored in a plurality of containers in small portions at a predetermined amount. FIG. 12 shows a specific example. Inorganic substance powder 11
Are contained in a plurality of bags 98 as containers in a sealed or semi-sealed state, and the amount of the powder 11 contained in each bag is, for example, the amount of powder used for one-time oil purification. Can be set to quantity. The bag body 98 can be made of, for example, paper, resin, or metal foil. In this case, the inside of the bag body 98 is suctioned under reduced pressure, sealed, and then the powder 11 is vacuum-packaged. Good. Furthermore, powder 1
A plurality of bags 98 containing 1 can also be contained in a package 99 such as a box.

As shown in FIG. 13, the bag 98 is opened, the powder 11 therein is dropped into the filter 82, and thereafter the oil W1 is poured by the method shown in FIG. This can be purified. Since the powder 11 is subdivided and sealed in a bag body, if it is opened and used immediately before use, component fluctuations (particularly water content) during storage, deterioration, and the like are suppressed, and the powder 11 is sealed. Can always be used in a good condition, and the weighing operation can be omitted.
In addition, the container body is not limited to the bag body 98, and FIG.
As shown in FIG. 4, a bottle 15 made of resin, glass, or the like
0 may be used. In this case, as the bottle 150, a bottle having a cap 150b that is screwed or fitted into the opening 150a to close the opening 150a can be used.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an oil purification device according to a first embodiment.

FIG. 2 is a schematic diagram showing a state of filtration of an inorganic substance powder in a filtration filter, and a state of powder particles falling off by injection of air.

FIG. 3 is a conceptual diagram showing an example of an apparatus provided with a filter cleaning mechanism for injecting a cleaning oil.

FIG. 4 is a conceptual diagram of an oil purification device according to a second embodiment.

FIG. 5 is a sectional view showing a modification of the filtration filter.

FIG. 6 is a sectional view showing another modification of the filtration filter.

FIG. 7 is a front sectional view of an oil purification device according to a third embodiment.

FIG. 8 is a plan sectional view of FIG. 7;

FIG. 9 is a conceptual diagram of an oil purification device according to a fourth embodiment.

FIG. 10 is a conceptual diagram of an oil purification device according to a fifth embodiment.

FIG. 11 is an explanatory diagram of an oil purification method according to a sixth embodiment.

FIG. 12 is a perspective view showing an example in which an inorganic substance powder is subdivided and stored in a bag.

FIG. 13 is a perspective view showing a method of using the same.

FIG. 14 is a perspective view showing an example in which inorganic substance powder is subdivided and stored in a bottle.

[Explanation of symbols]

 1, 51, 100 to 102 Oil purification device 2 Purification tank 3 Settling tank 4 Pump (hydraulic feeding means) 5 Filtration filter 6, 52 Separation tank 8, 56 Filter cleaning mechanism 11 Inorganic substance powder 17, 57 Introducing chamber 18, 58 Recovery Chamber W1 Oil L Air W2 Washing oil 78 Inlet line 79 Return line

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 36/04 B01D 35/02 E B01J 20/02 29/38 540 21/16 580A

Claims (10)

(57) [Claims] A step of bringing the inorganic substance powder containing water into contact with a high-temperature oil; and the step of causing the water contained in the inorganic substance powder to evaporate by the heat of the oil by the contact. A step of stirring the oil by the movement of the inorganic substance powder, and capturing and removing a dirt substance contained in the oil by the inorganic substance powder; and Separating the inorganic substance powder and recovering the purified oil from the inorganic substance powder. 2. The oil purification method according to claim 1, wherein a clay mineral containing hydrous aluminum silicate as a main component or a purified product thereof is used as the inorganic substance powder. 3. The oil purification method according to claim 1, wherein the oil is an edible oil, and the inorganic substance powder contains an alkaline component. 4. A purification tank for purifying the oil by holding a water-containing inorganic substance powder therein, and introducing high-temperature oil into the inside and bringing the oil into contact with the inorganic substance powder. An oil purification device, comprising: a separation unit configured to separate the purified oil and the inorganic substance powder. 5. The separation means, wherein: a separation tank into which a mixture of the inorganic substance powder and the oil is introduced for the separation; and an internal space of the separation tank through which the oil passes but the inorganic substance A filtration filter that partitions the powder with a roughness that does not pass through, and an oil formed on one side of the internal space partitioned by the filtration filter and mixed with the inorganic substance powder is introduced from the purification tank. A chamber, formed on the other side of the internal space, wherein the inorganic substance powder is filtered off by the filtration filter, and the purified oil passes through the filtration filter and is introduced from the introduction chamber side. The oil purification device according to claim 4, comprising: a recovery chamber in which the oil is recovered. 6. The oil purifying apparatus according to claim 5, further comprising hydraulic pressure feeding means for feeding the oil from the introduction chamber to the recovery chamber. 7. A gas such as air or cleaning oil is injected from the collection chamber side to the introduction chamber side through the filtration filter, and the inorganic substance powder attached to the filtration filter is injected to the introduction chamber side. The oil purification device according to claim 5, further comprising a filter cleaning mechanism that cleans the filter by dropping the filter. 8. A sedimentation tank between the septic tank and the separation tank, wherein a sedimentation tank for sedimenting coarse particles of the inorganic substance powder particles mixed in the oil is provided. The oil purifying apparatus according to item 1. 9. The oil purification device according to claim 5, wherein the introduction chamber of the separation tank is also used as the purification tank. 10. An introduction line communicating with a fryer and guiding oil from the cooker to the septic tank, and a return line for returning the purified oil separated by the separating means to the cooker. The oil purification device according to any one of claims 4 to 9, comprising: