JPS602899B2 - mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixing system, and more particularly to a fluid mixing device comprising a static fluid mixer element and a perforated plate.

Conventionally, as a mixing device, a dynamic mixer such as a machine, an extruder, or a pump, a static mixer without a driving part, or a combination thereof are generally known and widely used industrially. .

The mixing device is appropriately selected depending on the physical properties and chemical properties of the substances to be mixed and the purpose of mixing. The purposes of namiai are wide-ranging, including the homogenization of fluids, dispersion, chemical reactions, mass transfer such as extraction, absorption, and dissolution, and the promotion of ritual heat, and therefore the types of mixing and counterfeiting are diverse. In order to achieve these mixing purposes, various improvements have been made to the device structure and mixing conditions such as rotation speed in the continuous type mixer.

On the other hand, with static mixers, it is generally considered difficult to mix fluids with significantly different viscosities, and the current solution is to increase the number of elements in the static mixer or to use a static mixer. The only way to do this is to fine-tune the mixer with a stationary mixer, which would require an excessive amount of equipment to achieve the desired mixing purpose, and the construction cost would be enormous. It's a big obstacle to being able to do it. Particularly in the mixing of highly viscous substances, an increase in the number of static fluid mixer elements significantly increases the pressure drop within the mixing device, creating limitations in device strength and operation, and there are still virtually no effective methods for improving the content. Not provided.
As a result of intensive efforts by the present inventors to solve this problem, they found that it could be solved by aligning the static fluid mixer element and the perforated plate, and completed the present invention. That is,
In the present invention, a static fluid mixer element and a perforated plate are arranged in a pipe through which a fluid flows, and at least one static fluid mixer element is arranged so as to face a fluid outlet of the pipe. The present invention provides a mixed bag counterfeit product characterized by the following. The static fluid mixer element used in the present invention is preferably one that mixes a high viscosity fluid and a low viscosity fluid, and the perforated plate has a ratio of the sum of all pore cross-sectional areas to the plate cross-sectional area of 0. 55
and the ratio of the cross-sectional area of one hole to the sum of the cross-sectional mirrors of all holes is preferably 0.1 or less. The above-mentioned mixing device of the present invention is capable of mixing a highly viscous fluid having a viscosity in the range of 10 to 300,000 poise at a shear velocity of lsec-1 and a viscosity at 20 qo or 2 to 0 at the temperature at which mixing is carried out. The fluid of a solid substance has a viscosity of 0.2 to 5 °C above its melting point.
It is particularly suitable for mixing with low viscosity fluids in the 500 centipoise range. The static fluid mixer element used in the present invention is a mixer element that does not have a driving part, and for example, the product name Static Mixer (Kennick Co., Ltd.) exemplified in "Chemical Equipment 21 {3'20 (1979)" manufactured by),
Static mixing element (manufactured by Sulzer)
, Ross ISG mixer, Ross LPD mixer (manufactured by Charles Ross), Square mixer (manufactured by Sakura Seisakusho), Honeycomb mixer, Imstat mixer (manufactured by Tatsumi Kogyo), Shimazaki pipe mixer (manufactured by Tatsumi Kogyo), Shimazaki pipe mixer ( (manufactured by Koritsu Kogyo),
Mixer elements such as the same mixer (manufactured by Toray Industries) can be mentioned.

These mixing elements are usually used by installing one or more in the flow direction of the mixed fluid in the pipe. The perforated plate used in the present invention is a plate having independent pores and an arbitrary cross-sectional area and thickness, and is inserted into a pipe or integrated with the pipe, and is a static fluid mixer element. It is established as one thing with the pupil.

The pongee hole referred to here refers to a flow path through which a fluid passes, regardless of the manufacturing method, and the plate shape may have irregularities on the plate surface. Further, these perforated plates can be used alone or in combination, or the pores of a plurality of perforated plates can be connected as a pongee tube. When using a plurality of perforated plates and installing static mixer elements between the perforated plates, they may be arranged arbitrarily within 2 m, but if the number is greater than 2 m, When a perforated plate is disposed through a static mixer element, the synergistic effect is poor although the pressure loss is large. A typical example of a modified type of heat exchanger in which the pores of perforated plates are connected as a pongee tube is a shell-and-tube type heat exchanger. The arrangement of the static fluid mixer element and the perforated plate in the mixing bag of the present invention requires that at least one static mixer element be arranged downstream of the mixed fluid in the pipe, and as necessary. For example, each functional element such as a perforated plate, a static fluid mixer element, a perforated plate, and a static fluid mixer element can be appropriately arranged or used in combination depending on the object to be mixed or the purpose of mixing.

The mixing effect of the present invention cannot be obtained with a simple elbow mixing device in which a perforated plate is simply placed on the downstream side of a stationary flow mixer, and at least one stationary fluid mixer element is arranged downstream of the flow mixer. It is necessary.

The shape of the pongee holes in the perforated plate is arbitrary, but it is determined by the ratio of the sum of all pore cross-sectional mirrors to the cross-sectional area of the plate (hereinafter abbreviated as Sekiguchi ratio).

) is 0.55 or less, and the ratio of the cross-sectional area of one pongee pore to the sum of the cross-sectional area of all pores (hereinafter abbreviated as distribution ratio) is 0.
．． It is preferable to set it to 1 or less. The sea bream hole ratio is 0.
The range of 1 to 0.35 is optimal, and if it exceeds 0.55, the pore spacing on the perforated plate becomes small, and when mixing a low viscosity fluid that is incompatible with a high viscosity fluid, etc. Although the particles are once dispersed in the pores of the perforated plate, re-agglomeration occurs at the outlet of the perforated slope, making it impossible to achieve the mixing improvement effect of the present invention. Further, the distribution ratio is more preferably 0.05 or less, and 0.05 or less.
．． When it is greater than 1, the mixing improvement effect becomes poor.
The perforated plate can be placed at any desired location as described above, but it can also be inserted into a mixing device such as a screw pump that is a combination of a dynamic mixer and a static mixer. A highly viscous fluid suitable for use in the mixing device of the present invention has a viscosity of at least 10 poise at lsec-1, preferably 500 poise at the temperature at which the mixing is carried out. That's all.

These high viscosity fluids include, for example, polypropylene,
Polyethylene, polystyrene, high impact polystyrene, A
S resin, polyvinyl chloride, polyester, polyimide,
Examples include polyamide, polyether sulfone, starch syrup, water glass, etc., and solutions thereof. If the high viscosity fluid is a fluid with a viscosity lower than 10 poise, the effect of installing a perforated plate will not be noticeable, and mixing of fluids with a viscosity exceeding 300,000 poise is practically not done industrially. Yes, no. On the other hand, low-viscosity fluids suitable for use in the mixing device of the present invention include, for example, mineral oil, higher alcohols, higher fatty acids and their solutions, water, organic solvents such as methyl ethyl ketone, acetone, methanol, styrene, ethylbenzene, and acrylonitrile. Examples include solvents, organic peroxides such as lauroyl peroxide and benzoyl peroxide, and solutions thereof, antioxidants, antistatic agents, dyes, plasticizers, and solutions thereof.

In the case of a substance that is solid at 2p0 or 2bC, a fluid exhibiting a viscosity of 0.2 centipoise or less at a temperature 5°C higher than its melting point can be treated as the high viscosity fluid if it is removed from the gas. It is industrially impossible for them to be moated together.

Gas and high viscosity fluids are usually mixed using a sardine type mixer or a mixing device that combines a dynamic mixer and a static mixer, and in this case, even if a perforated plate is installed, the No effect was observed. Also, the viscosity of low viscosity fluid is 500
When the centipoise is exceeded, the mixing performance by installing a perforated plate is the same as increasing the number of static mixer elements so that the pressure loss in the mixing device is the same as when installing a perforated plate. No effect was observed due to the installation of perforated plates. Next, a perforated plate suitable for carrying out the present invention and the arrangement of the static fluid mixer element and the perforated plate will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a perforated plate 1 used in the present invention having graded holes 2, each of which is arranged on the perforated plate 1 with an appropriate distance from each other, and the inside of each of the pores 2 is mixed. Fluid passes through it.

The shape of the pongee hole 2 is arbitrary, and an appropriate shape can be selected. The thickness of the perforated plate is appropriately selected in consideration of pressure, pressure loss, etc. during mixing. FIG. 2 shows the static fluid mixer element 3
FIG. 1 is a schematic diagram showing an example of the mixing apparatus of the present invention in which a perforated plate 1 is installed between.

The static fluid mixer element 3 and the perforated plate 1 are installed in a suitable manner in the tube 4, and the fluid to be mixed enters through the inlet 5;
While passing through each stationary fluid mixer element 3 and the perforated plate 1, the fluid receives a mixer and reaches the outlet section 6.

According to the device of the present invention, the mixing performance is dramatically improved compared to the case of only a static mixer, so the number of static fluid mixer elements can be significantly reduced, and especially for high viscosity substances. In mixing, increase in the number of static fluid mixer elements and bags, which is the momme point of the subordinate fluid mixer. It is possible to solve the equipment and operational limitations caused by increased direct pressure loss.

This point is so remarkable that it could not be predicted from the conventional technology, and is an epoch-making feature that dramatically expands the applications of static mixers that contribute to energy saving. Next, the present invention will be specifically explained with reference to Examples.

Example 1 A circular porous plate with a diameter of 50 and a thickness of 5 in which circular pongee holes with a diameter of 2 are arranged in 150 locations with a center distance of 3. (Sekiguchi ratio 0.2 and distribution ratio 0.007 ), Naiyo 5
Using a mixing device inserted between the second and third elements from the upstream side of the flowing fluid of a 14-element Static Mixing Element (SMK type) made by Sulzer, which was installed in a two-walled pipe. , acrylonitrile-styrene copolymer resin (hereinafter abbreviated as AS resin).

) and natural oil were mixed and dissolved. The mixing apparatus was covered with a jacket and kept at a low temperature with hot soot. AS resin is 220℃,
The breaking speed is 100,000 poise at lsec-1,
22,000 and use a gear pump to pump the inside of the mixing device to 10
It was passed at a speed of k9/Hr. Shark oil is 2pi0 and 100
Centipoise was injected into the mixing device at the rate shown in Table 1 using a metering pump through a thin tube introduced into the inlet of the mixing device. The degree of mixing and dissolution is determined by stretching the mixture 5k9 of AS resin and mineral oil taken out from the mixing device outlet into a thin plate shape with a thickness of one square, and observing it using an optical microscope with a magnification of 100 times. Dissolution of mineral oil droplets was performed in a number of ways. In addition, the difference in the readings of the separate pressure gauges installed at the inlet and outlet of the mixing device was taken as the pressure loss inside the mixing device. These results are shown in Table 1.

Example 2 Rectangular pores with a width of 1 wind and a length of 3 meters are arranged in 15 locations parallel to each other with a distance of 1 candle, each side having 35 holes.
A static mixer made by Kenix Co., Ltd., product name, with a 3-term Aoi prime number, in which a square-shaped perforated plate (opening ratio 0.37, distribution ratio 0.067) with a thickness of 3 mm is placed inside a 1/2-inch pipe. Using a mixing device installed between the 8th and 9th elements from the upstream side of the fluid to be mixed, a solution (hereinafter referred to as M solution) consisting of 3 parts by weight of polystyrene, 10 parts by weight of styrene 6, and 10 parts by weight of ethylbenzene was prepared. It is abbreviated as

) and water were mixed and dispersed at 150 oo. The viscosity of the solution is 15 poise at 150°C and a cutting speed of lsec-1,
The whistle solution was passed through the mixing device at a rate of 18k9/Hr using a gear pump. Water was injected into the mixer at the proportions shown in Table 1 using a metering pump through a pongee pipe introduced into the inlet of the mixer. Mixing and dispersion was determined by observing the mixture of PS solution and water taken out from the outlet of the mixing device using a loupe with a magnification of 1 pep, and based on the average particle diameter of the dispersed water. The pressure loss inside the mixing device was expressed by the difference in pressure gauge readings at the inlet and outlet of the device. These results are shown in Table 1.

Comparative Example 1 Mixing and dissolution was carried out under exactly the same conditions as in Example 1 except that the perforated plate was removed.

The results are shown in Table 1.

Comparative Example 2 Mixing and melting was carried out under exactly the same conditions as in Example 1 except that the perforated plate was removed and the number of static mixing elements was changed to 24.

The results are shown in Table 1. Comparative Example 3 Mixing and dispersion was carried out under exactly the same conditions as in Example 2 except that the perforated plate was removed.

The results are shown in Table 1.

Comparative Example 4 Mixing was carried out under exactly the same conditions as in Example 2 except that the perforated plate was removed and the number of static mixer elements was changed to 50.

The results are shown in Table 1.

Table 1 Reference Example 1 In Example 1, a circular perforated plate with a diameter of 5 m and a thickness of 5 m was prepared by arranging two semicircular pongee holes each having a diameter of 35 arms (
Mixing and dissolution was carried out under exactly the same conditions except that the Sekiguchi ratio was 0.49 and the distribution ratio was 0.5.

As a result, the total number of nutrient oils was 1381, and the pressure loss was 5.
It was 7k9/th. Reference Example 2 Starch syrup with a viscosity of 5 poise at 20 qo and a connecting speed lsec-1 and styrene with a viscosity of 0.78 centipoise at 20 qo were mixed at 20 qo using the apparatus used in Example 2 and Reference Example 1.
Mix and disperse.

The starch syrup was passed through the apparatus at a flow rate of 7k9/Hr using a gear pump, and the styrene was passed through the apparatus using a metering pump at a flow rate of 0.1k9/Hr. The average particle size of the dispersed styrene, which was measured by observing the fluid taken out from the device outlet with a loupe with a magnification of 1 peep, was 0.07 when using the device of Example 2, and 0.07 when using the device of Reference Example 1. In that case, the ship's side would have been 0.09. Reference Example 3 At 20° C. and a rock cutting speed of lsec-1, starch syrup of 3000 poise and a styrene solution of polyptadiene of 1000 centipoise at 20° C. were mixed and dispersed at 2 poise.

The apparatus used for mixing and dispersing was the one used in Example 2 and Reference Example 1 above. Starch syrup is 15k9/ by gear pump
The polybutadiene solution was introduced into the mixing device at a rate of 2k9/day using a metering pump, and the fluid taken out from the device outlet was observed with a loupe with a magnification of 1 peep to determine the average particle size of the dispersed polybutadiene solution. The results were 0.45 side when the device of Example 2 was used, and 0.52 side when the device of Reference Example 1 was used.

[Brief explanation of drawings]

FIG. 1 is an example of a plan view of a perforated plate arranged in the mixing device of the present invention, and FIG. This is an example of a diagram. 1...Perforated plate, 2...Pongee hole, 3...
...Static fluid mixer element, 4...Pipe, 5.
...Mixing device inlet section, 6...Mixing device outlet section. Figure 1 Figure 2

Claims (1)

[Claims] 1. A static fluid mixer element and a perforated plate are arranged in a pipe through which a fluid flows, and at least one static fluid mixer element is arranged so as to face a fluid outlet of the pipe. A fluid mixing device characterized by: 2 The perforated plate has a ratio of the sum of all pore cross-sectional areas to the plate cross-sectional area of 0.
．． 55 or less, and the ratio of the cross-sectional area of one hole to the sum of the cross-sectional areas of all the holes is 0.1 or less.