JP2782115B2 - Liquid sugar production equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a liquid sugar production apparatus in which a sucrose type liquid sugar production line and an invert type liquid sugar production line are provided in a cane sugar refining factory. It is about.

[Conventional technology]

In a sugar cane refining factory, sucrose (sucrose) solution is decolorized using activated carbon and an ion-exchange resin, and a sucrose solution is concentrated to a sugar concentration of about Brix.67. After the solution is similarly decolorized with activated carbon, the solution is passed through a packed column of a strongly acidic cation exchange resin, RH form, to adsorb and remove the cationic impurities contained in the sugar solution, and the RH form is added. The sucrose molecule is hydrolyzed by using a certain acidic active group, and is converted into a reducing sugar molecule of glucose (glucose) and fructose (fructose) containing about 50% of sucrose contained in the sugar solution, and remains. After the anionic impurities and the dye component are passed through an R-OH type packed column of an anion exchange resin to be adsorbed and removed, an invert type liquid sugar is manufactured as a product after being concentrated to a sugar concentration of about Brix.76. You.

Sucrose molecules can easily purify crystals,
Since the reducing sugar component does not crystallize, in a cane sugar refining factory whose main purpose is to produce sugar crystals, it is an important condition to completely prevent the refining sugar from being purified during the refining process.

This means that sucrose-type liquid sugar has no problem in the production of liquid sugar, but it is necessary to take great care to prevent inverted liquid sugar from being mixed in the cane sugar refining process. The production process of sugar and invert type liquid sugar is completely separated and installed.

[Problem to be solved]

The market for isomerized sugar produced from starch and inverted liquid sugar produced at the sugar cane refinery is a competitive product, and the liquid sugar production process at the sugar cane refinery can compete with the isomerized sugar factory. It is necessary to rationalize the equipment, and if the production process of sucrose-type liquid sugar and invert-type liquid sugar can be performed by common equipment, the effect is large in terms of rationalization in the cane sugar refining factory. The present invention has been made to that end.

[Means for solving the problem]

The gist of the present invention is that a mixed bed type ion exchange resin column packed with a strongly basic anion exchange resin and a weakly acidic cation exchange resin, which can take a mixed or upper and lower two-layer packing system interchangeably, is sucrose. In addition to the main part of the liquid sugar production line, the series of the sucrose-type liquid sugar production line and the common mixed-bed ion exchange resin column, which are the same as the sucrose-type liquid sugar production line above, is converted to the conversion type. The present invention resides in an apparatus for producing liquid sugar in which a production line for sucrose-type liquid sugar and a production line for invert-type liquid sugar are provided side by side, the production line being a main part of a liquid sugar production line.

(Operation)

 Hereinafter, the present invention will be described in detail.

Since sucrose molecules have the property of undergoing a hydrolysis reaction in the presence of an acid to readily decompose into reducing sugars, in the process of producing sucrose-type liquid sugar, the decomposition of sucrose molecules in the entire production process as well as in the ion exchange process It is an essential condition to completely prevent the reaction.

For this reason, the use of a strongly acidic cation exchange resin in a method of desalting a sucrose solution using an ion exchange resin is extremely dangerous from the standpoint of preventing the hydrolysis reaction of sucrose molecules. After removing anionic impurities with a strong basic anion exchange resin R-OH type ion exchange resin, making the sugar solution pH alkaline, and using a weakly acidic cation exchange resin RH form A method of removing cationic impurities and making the pH of the liquid sugar neutral is used. In a normal ion exchange apparatus, for the purpose of causing an effective ion exchange reaction, a method of first treating with a packed tower of a cation exchange resin and then treating with a packed tower of an anion exchange resin is used. I have. On the other hand, in the production of sucrose-type liquid sugar, since it is first treated with an anion exchange resin and then treated with a packed column of a cation exchange resin for the purpose of preventing the hydrolysis reaction of sucrose molecules,
It is generally called a reverse method because it is the reverse of the normal method. In contrast to the reverse method, in which a packed tower of anion exchange resin and a packed tower of cation exchange resin are installed independently, a mixed bed type ion exchange device in which both ion exchange resins are filled in a single tower and mixed for use Can be used. In a mixed-bed type ion exchange apparatus, a processing liquid having an extremely high purity can be obtained as compared with the reverse method. However, in the regeneration operation of the inactive ion exchange resin, the two ion exchange resins are separated. However, there is a problem that the advantage of the reverse method cannot be easily discussed due to the difficulty of the separation operation.

In a mixed-bed ion exchange apparatus, a backwashing method using water is usually used as a method for separating a cation exchange resin and an anion exchange resin. This is a method that can be used when there is a certain difference in specific gravity between the ion exchange resins to be used, and is applied only when a strongly acidic cation exchange resin can be used as the cation exchange resin. It is a method that can be. On the other hand, in a mixed-bed ion exchange apparatus for producing sucrose-type liquid sugar, it is essential to use a weakly acidic cation exchange resin as a cation exchange resin in order to prevent a hydrolysis reaction of sucrose molecules. Although it is a condition, the specific gravity of a commercially available weakly acidic cation exchange resin is approximately the same as the specific gravity of the anion exchange resin, so that it is impossible to perform a separation operation by a normal backwashing method using water.

Therefore, in an ion exchange apparatus for producing a mixed-bed sucrose-type liquid sugar, a specific gravity separation method using a sugar liquid is used. This method uses a slight difference in specific gravity between the cation exchange resin and the anion exchange resin used in the mixed-bed ion exchange apparatus, and is used in a sugar solution having a specific gravity almost intermediate between the two. In this method, both ion-exchange resins are dispersed and sedimentation of a weakly acidic cation-exchange resin having a specific gravity slightly larger than that of the anion-exchange resin and separation of the strongly basic anion-exchange resin by floating.

This method is generally called a sugar liquid separation method. In the sugar liquid separation method, in a mixed bed type ion exchange apparatus in which a predetermined amount of liquid passing processing is completed, water or hot water is added to the liquid to be treated remaining in the packed tower. After adjusting the sugar concentration to a specific gravity suitable for the separation operation, air is mixed to disperse the ion-exchange resin in the sugar solution to perform separation.

After the separation is completed, water or warm water is passed down in a downflow manner to support the ion-exchange resin while maintaining the state of separation of the weakly acidic cation exchange resin in the lower layer and the strongly basic anion exchange resin in the upper layer. The sugar liquid used for the separation operation, which is pressed down on the floor to be fixed and flows out, is collected in a collection tank and mixed with the stock solution used for the production of sucrose-type liquid sugar in the next cycle after the predetermined regeneration operation is completed. And refined to produce a product.

On the other hand, in the case of a mixed bed type for treating invert type liquid sugar, there is a problem that the liquid to be treated cannot be used in such a recovery and circulation system. In other words, the flow rate of the strongly acidic cation exchange resin tower is set such that the conversion rate of sucrose is a predetermined conversion rate, and the operation is performed by setting the flow rate and the temperature. That the conversion rate cannot be kept constant,
When starting the production of sucrose-type liquid sugar, it was an important problem that there was no method to dispose of the recovered separated sugar solution containing a large amount of reducing sugar.

As a result of intensive studies to solve these problems, the present inventors have solved them by the following method.

That is, when a sucrose-type liquid sugar is produced, a treatment liquid of excellent quality is produced by a mixed-bed type ion exchange apparatus as in the related art.

On the other hand, when producing invert type liquid sugar, the ion exchange resin packed in a mixed bed type ion exchange device is used, the strong basic anion exchange resin is sodium hydroxide aqueous solution, and the weakly acidic cation exchange resin is hydrochloric acid. Alternatively, after regenerating with an aqueous solution of sulfuric acid and performing necessary cleaning, the regenerating step is terminated in a state of being separated into two layers without mixing both ion-exchange resins by air mixing.

Thus, the stock solution is first passed through a strongly acidic cation exchange resin column to adsorb and remove cationic impurities, and utilizing the action of the RH type active group of the strongly acidic cation exchange resin, After the sucrose conversion reaction proceeds, the sucrose is passed through a mixed bed type ion exchange resin column having two layers of cation and anion exchange resins.

As a result, the strong acid cation exchange resin tower treatment liquid that has reached a certain conversion rate is mixed in the mixed bed type ion exchange resin tower,
By first contacting a strongly basic anion exchange resin activated in the R-OH form, anionic impurities and dye components can be adsorbed and removed. At this time, if there is a cationic impurity that was partially incompletely removed in the strongly acidic cation exchange resin tower, the pH becomes alkaline by ion exchange with the strongly basic anion exchange resin, and the coloration in the subsequent concentration step Fortunately, the lower part of the mixed-bed ion exchange resin column must pass through a layer of a weakly acidic cation exchange resin activated to the RH form, and as a result, the increased pH is weak. It is neutralized by the action of the acidic cation exchange resin, and a neutral inverted liquid sugar can be obtained.

The regeneration operation is performed at the stage when the liquid passing is completed. At this time, since the positive and anion exchange resins are not mixed, there is no need to separate them, and the liquid to be treated remaining in the ion exchange resin tower is directly used as water. Alternatively, the ion exchange resin of the mixed bed type ion exchange resin tower, which has been extruded with warm water and collected in the treatment liquid side to directly produce the product, and the collection of the sugar solution has been completed, has already been separated. With an aqueous solution of sodium hydroxide, the weakly acidic cation exchange resin can be regenerated to its active radical form by passing an aqueous solution of hydrochloric acid or sulfuric acid.

Thereafter, when moving to the production of sucrose-type liquid sugar, the two resins whose regeneration has been completed are uniformly mixed by air mixing and passed through using only a mixed-bed type ion exchange resin tower. Can be manufactured.

As described above, by installing both ion-exchange devices of a strongly acidic cation exchange resin tower and a mixed-bed type ion exchange resin tower, sucrose-type liquid sugar and invert-type liquid sugar can be freely produced in a cane sugar refining factory. Is what you can do.

〔Example〕

In the sucrose-type liquid sugar production line (SL) shown by the double thin line in FIG. 1, the stock solution (SS) is supplied directly to the mixed bed type ion exchange column (MB column) via an activated carbon packed column not shown. Is passed through a mixed layer of a strong basic anion exchange resin (SBAER) and a weakly acidic cation exchange resin (WACER), which have been uniformly mixed in advance by air mixing. (STLS) is obtained.

At the end of this passage, water is injected into the sugar solution remaining in the MB tower to adjust the sugar solution concentration, and then air mixed to separate SBAER and WACER into two upper and lower layers. After these are pressed down on the exchange bed and fixed, the sugar solution used for separation is
Recycled by SS.

On the other hand, hydrochloric acid is passed through the upper and lower layers of the SBAER and WACER to regenerate the latter, and then the aqueous sodium hydroxide solution is passed to regenerate the former to perform necessary washing, and then mixed with air. Both ion exchange resins (SBAER) and (WACER)
And then the production of sucrose-type liquid sugar is continued.

On the other hand, the invertable liquid sugar production line (I.
In L.), the undiluted solution is first sent to a K column filled with strongly acidic cation exchange resin (SACER) via an activated carbon packed column not shown, etc. In this MB tower, a strongly basic anion exchange resin layer (SBAER) and a weakly basic cation exchange resin layer (WACER) are separated into two upper and lower layers as shown in the figure. The desired invert type liquid sugar (ITLS) is obtained by passing through the upper and lower mixed layers.

If the production line for invert type liquid sugar is continued from the production line for sucrose type liquid sugar, the SBAE regenerated as described above
Since R and WACER are separated into upper and lower two layers, they do not mix both ion exchange resins by air mixing, and do not require separation of both ion exchange resins.
The sugar solution is passed through the column and then the MB column, which is separated into two layers, to obtain invertible liquid sugar (ITLS).

In addition, in order to return from such an invert type liquid sugar production line to a sucrose type liquid sugar production line again, after the passage of the sugar solution,
K column, MB column in order to recover the sugar liquid remaining in both towers through water or hot water to make a product, then regenerate the K tower by a conventional method, and wait for the next production of invert type liquid sugar, The MB tower is regenerated by a conventional method, mixed uniformly by air mixing, and then supplied to sucrose-type liquid sugar.

〔The invention's effect〕

In the conventional sugar liquid apparatus equipment, the sucrose type liquid sugar production line and the invert type liquid sugar production line are separately and independently provided in parallel, whereas in the present invention, the ion exchange in the former sucrose type liquid sugar production line is performed. The resin tower is a mixed bed type ion exchange resin tower in which a strongly basic anion exchange resin and a weakly acidic cation exchange resin are mixed or packed in two layers, and the former is a strong acidic anion exchange resin tower in the former conversion type liquid sugar production line. By sharing the equipment with the ion-exchange resin tower at the subsequent stage following the cation-exchange resin tower, the facilities in both liquid sugar lines were streamlined. is there.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a liquid sugar producing apparatus according to the present invention. K tower: Strongly acidic cation exchange resin packed tower MB tower: Mixing of strongly basic anion exchange resin and weakly acidic cation exchange resin or two-layer packed tower SL: Sucrose-type liquid sugar production line IL: Invertable liquid sugar production line SACER …… Strongly acidic cation exchange resin SBAER …… Strongly basic anion exchange resin WACER …… Weakly acidic cation exchange resin STLS …… Sucrose type liquid sugar ITLS …… Inverted type liquid sugar

──────────────────────────────────────────────────続 き Continuing on the front page (72) Masao Kitamura, Inventor 1-17-13 Umejima, Adachi-ku, Tokyo (72) Inventor, Hiroshi Yame 280-130, Rokumi Goka, Matsudo-shi, Chiba Prefecture (58) Field surveyed (Int. Cl. ⁶ , DB name) C13D 3/14 B01D 15/04 B01J 47/02-47/04

Claims (3)

(57) [Claims] 1. A mixed bed type ion exchange resin column packed with a strongly basic anion exchange resin and a weakly acidic cation exchange resin, which can be used interchangeably in a mixed or upper and lower two-layer packing system, is prepared by mixing a sucrose type liquid sugar. A main part of the production line, and a series of a mixed-bed type ion-exchange resin tower shared with the above-mentioned sucrose-type liquid sugar production line and a shared-bed type ion-exchange resin tower following the packed tower of the strongly acidic cation exchange resin is used to produce invertable liquid sugar. An apparatus for producing liquid sugar, wherein a production line for sucrose-type liquid sugar and a production line for invert-type liquid sugar are provided side by side as main parts of the line. 2. The liquid according to claim 1, wherein the strongly basic anion exchange resin and the weakly acidic cation exchange resin in the mixed bed type ion exchange resin tower are uniformly mixed in the sucrose type liquid sugar production line. Sugar production equipment. 3. In a production line for invert type liquid sugar, a strongly basic anion exchange resin and a weakly acidic cation exchange resin in a mixed bed type ion exchange resin tower are separated into two upper and lower layers. An apparatus for producing liquid sugar according to the above.