JPS6031829A - High purity refining method of aqueous non-electrolytic organic substance solution - Google Patents

Abstract

PURPOSE:To refine the title aqueous solution to high purity, by providing dimethylhydroxyethyl-benzylammonium to a free base type weak basic ion exchange resin. CONSTITUTION:A layer comprising a free base type weak basic anion exchange resin, to which 5-50vol% of dimethylhydroxyethyl-benzylammonium is provided as an ion exchange group, is formed as an upper layer part and a layer comprising a hydroxyl type strong basic anion exchange resin having a porous resin matrix structure is formed as a lower layer part to form a resin bed. Subsequently, an aqueous non-electrolytic org. substance solution after cation removing treatment is passed through said resin bed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for purifying a non-electrolytic organic aqueous solution to high purity.

Conventional technology Aqueous solutions of non-electrolytic organic substances such as glucose, high fructose sugar, starch syrup, nlubitol, xylose, inositol, maltose, sucrose, honey, glyoxal, glycerin, and gelatin contain impurities such as pigments, salts, and organic acids. In order to purify these aqueous solutions, adsorbents such as bone char and activated carbon are used, and ion exchange resins are also widely used. The conventional ion exchange method widely used for the purification of these aqueous solutions is to first use a single resin column of a hydrogen-type strongly acidic cation exchange resin, and then to use a single resin column of a free base-type weakly basic anion exchange resin. There are also products that undergo decolorization and desalination purification by sequential treatment in a mixed bed resin column containing a hydrogen type strongly acidic cation exchange resin and a hydroxyl group type strongly basic anion exchange resin.

However, with this method, there are problems such as the liquid after passing through the ion exchange resin decreasing in - value over time and gradually becoming colored during heating and concentration, resulting in a decrease in product quality. Productivity often deteriorated.

OBJECTS OF THE INVENTION An object of the present invention is to provide a method that can produce high-purity F# from a non-electrolyzed organic aqueous solution using an ion exchange resin and provide a high-quality treated product. .

Components of the Invention The present invention provides a method for purifying a non-electrolytic organic aqueous solution to high purity, and this method comprises decationizing the non-electrolytic organic aqueous solution t1 with a hydrogen-type strongly acidic cation exchange resin, and then converting the free base into A type of weakly basic anion exchange resin is filled in the upper layer, and a porous resin containing 5 to 5% (ljj%) of dimethyl hydroxyethylbenzyl ammonium as an exchange group to the free base type weakly basic anion exchange resin is used. It has a resin matrix structure of: hydroxyl group-type strongly basic anion exchange resin and is passed through a column packed in the lower layer.

As a result of intensive research into purification methods for various non-electrolytic organic aqueous solutions, the present inventors have discovered that a non-electrolytic aqueous solution that has been decationized using a hydrogen-type strongly acidic cation exchange resin can be purified using a free base-type weakly basic anion exchange resin. By passing through a column in which 5 to 50 volumes of a hydroxyl group-type strongly basic anion exchange resin having dimethyl hydroxyethylbenzylammonium as an ion exchange group and a porous resin matrix structure is added to the resin in a layered manner, The present invention was achieved based on the discovery that an extremely excellent desalting effect can be obtained.

The free base-type weakly basic anion exchange resin and the hydroxyl group-type strongly basic anion exchange resin utilize the difference in specific gravity between the two to form a column in which the latter is packed under the former in a layered manner. is preferable. According to the method of the present invention, impurities in a non-electrolytic organic aqueous solution that could not be easily removed using conventional weakly basic anion exchange resins can be effectively removed by ion exchange. Ideal desalting and purification can be performed without causing problems such as.

In the method of the present invention, the hydroxyl group type strongly basic anion exchange resin is preferably added in an amount of 5 to 20 volume parts relative to the free base type weakly basic anion exchange resin.

Examples of free base type weakly basic anion exchange resins useful in the present invention include DOWEX.

66 (registered trademark of De Dow Chemical Company), Amberlite (A (1b@rlite, registered trademark of Rohm and Haas Company, USA) IRA-93, Diaion (registered trademark of Mitsubishi Chemical Corporation) WA- Examples of porous hydroxyl group-type strongly basic anion exchange resins having dimethyl hydroxyethyl benzyl ammonium as an exchange group include DOWEX MSA-2 and Amberlite IRA-2. There are anion exchange resins such as 910.
Examples of hydrogen-type strongly acidic cation exchange resins include /”
71-x88, Amberlite IR-200, etc.

EXAMPLES The present invention will be further illustrated by the following examples, but the invention is not limited by these examples.

Example 1 In order to subsequently deanionize a beet sugar aqueous solution that has been decationized using a hydrogen-type strongly acidic cation resin, free base type DOWEX 66 (de Dow Chemical Can) is added to the upper layer of the same resin column.・Filled with 2 ml of porous styrenic anion exchange resin (manufactured by the Dow Chemical Company) and 0 ml of hydroxyl group-type DOWEX MSA-2 (The Dow Chemical Can/F Ni Real long-porous styrenic anion exchange resin) in the lower layer.
．． The method of the present invention was carried out using a column packed with 2 mNr and compared with conventional treatment.

That is, a beet sugar aqueous solution (BXI 5.1, PH 2.1, electrical conductivity 2200) after decationization was added to the resin column.
When the effluent was introduced at a space velocity of 6 μV) and the electrical conductivity of the effluent was continuously measured, the graph shown by the solid line in FIG. 1 was obtained. In the figure, the vertical axis indicates - and electrical conductivity, and the horizontal axis indicates time and flow rate.

In addition, when we measured the voice and electrical conductivity of the effluent under the same conditions as above using a resin column filled only with DOWEX 66, the graph shown by the broken line in Figure 1 was obtained. Obtained.

As is clear from these graphs, the method of the present invention provides a much better desalting effect and a larger throughput than the conventional method.

Example 2 Aqueous isomerized sugar solution (BX37.2, p) (2,0, electrical conductivity 1000 μv) decationized with hydrogen type strongly acidic cation exchange resin 1, column with the same configuration as used in Example 1 When the sound and electrical conductivity of the effluent were continuously measured, the graph shown by the solid line in FIG. 2 was obtained.

In addition, treatment was performed using the conventional method in exactly the same manner as in Example 1,
The electrical conductivity of the effluent was measured. The results are shown graphically in FIG. 2 with broken lines.

From these graphs, it can be seen that the method of the present invention provides a much better desalting effect and a larger throughput than the conventional method.

[Brief explanation of the drawing]

Figures 1 and 2 are graphs of PL (and electrical conductivity) of the effluent obtained in the example of the present invention, respectively. Patent applicant: Akira Aoki, patent attorney, Dawa Chemical Japan Co., Ltd. Patent Attorney Kazuyuki Nishidate Patent Attorney Yoshi 1) Patent Attorney Akio Yamaguchi Patent Attorney Masaya Nishiyama

Claims (1)

[Claims] 1. After decationizing the non-electrolytic organic aqueous solution with a hydrogen type strongly acidic cation exchange resin, the upper layer is filled with a free base type weakly basic anion exchange resin, and this free base type weakly basic anion 5 to 50 volumes per exchange resin,
High purity of a non-electrolytic organic aqueous solution comprising passing it through a column packed in the lower layer with a hydroxyl group-type strongly basic anion exchange resin having a porous resin matrix structure with an exchange group of dimethyl hydroxyethyl benzyl ammonium. Purification method.