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Method for treating citric acid-containing solution

A technology of citric acid solution and treatment method, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of high production cost, large amount of waste liquid, and high consumption of raw materials and auxiliary materials, and achieves reduction of environmental protection treatment costs and improvement of Purity and concentration, the effect of reducing energy consumption

Active Publication Date: 2011-09-21
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the method of the prior art has a long raw material treatment process route, high consumption of raw and auxiliary materials, low yield, small amount of citric acid adsorbed per unit resin, low product concentration and purity, high return of mother liquor, high acid-base consumption , The amount of waste liquid is large, which ultimately makes the production cost high

Method used

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  • Method for treating citric acid-containing solution
  • Method for treating citric acid-containing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Removal of cations: 1000L of centrifugation qualified (control index turbidity less than 10NTU), content is 16.0% by weight of citric acid clear liquid (wherein, iron ion content is 1.0ppm) by 1.8 times column volume / hour Flow rate passes through the exchange column that cation exchange resin (as 001 * 7) is housed to remove cation therein, obtains the effluent A1 of 1120L, and citric acid content is 14.15% by weight in the effluent A1, and iron ion content is 0.25ppm, and cation The working temperature of the exchange resin is 35°C;

[0051] (2) decolouring: the effluent A1 that step (1) is obtained enters the decolorization process by the GH-15 carbon column at a flow rate of 1.8 times column volume / hour, and the content of citric acid in the effluent B1 and the effluent B1 of 1200L is obtained is 13.0% by weight, the light transmittance of the effluent B1 is 85%, and the temperature during the decolorization treatment is 50°C;

[0052] (3) Ion-exchange chromatog...

Embodiment 2

[0066] (1) Remove cations: 710L qualified by centrifugal separation, content is 15.5% by weight of citric acid supernatant (wherein, iron ion content is 1.2ppm) and the citric acid mother liquor that obtains in 54L embodiment 1 mixes, by 1.5 times The flow rate of column volume / hour passes through the exchange column that cation exchange resin (as 001 * 7) is housed to remove cation therein, obtains the effluent A2 of 850L, and the citric acid content is 17.88% by weight in the effluent A2, iron ion content is 0.3ppm, and the working temperature of the cation exchange resin column is 40°C;

[0067] (2) decolorization: the effluent A2 that step (1) is obtained enters the decolorization process by the GH-11 carbon column at a flow rate of 1.5 times of column volume / hour, and the content of citric acid in the effluent B2 and the effluent B2 of 920L is obtained is 16.3% by weight, the light transmittance of the effluent B2 is 82%, and the working temperature during decolorization ...

Embodiment 3

[0075] (1) Remove cations: 1000L qualified by centrifugal separation, content is 15.0% by weight of citric acid supernatant (wherein, iron ion content is 1.5ppm) and the citric acid mother liquor that obtains in 60L embodiment 2 mixes, by 2.0 times The flow velocity of the column volume / hour is passed into an exchange column equipped with a cation exchange resin (such as 001×7) to remove cations therein to obtain 1150L of effluent A3, and the citric acid content is 16.56% by weight in the effluent A3, and the iron ion content is 0.35ppm, and the working temperature of the cation exchange resin column is 30°C;

[0076] (2) decolorization: the effluent A3 that step (1) is obtained enters decolorization process by GH-15 charcoal column by the flow rate of 2.0 times column volume / hour, obtains the content of citric acid in the effluent B3 of 1250L, effluent B3 is 15.05% by weight, the light transmittance of the effluent B3 is 83%, and the working temperature during decolorization ...

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Abstract

The invention provides a method for treating citric acid-containing solution, which is characterized by comprising the following steps of: (1) making the acid-containing solution flow through a cation exchange resin column and contacted with cation exchange resin therein to obtain effluent liquid A; (2) making the effluent liquid A flow through an active carbon column and contacted with active carbon therein to obtain effluent liquid B; and (3) contacting the effluent liquid B with a plurality of anion exchange resin column groups for ion exchange chromatography, wherein each anion exchange resin column group circularly passes through an adsorption area, a purification area, an elution area and a regeneration area in turn so as to be circularly subjected to exchange adsorption, purification, elution and regeneration in turn. By the method for treating the citric acid-containing solution, high-purity and high-yield citric acid can be obtained in unit time, and the method is energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a treatment method for a solution containing citric acid. Background technique [0002] Citric acid, also known as citric acid, its chemical name is 2-hydroxypropanetricarboxylic acid. Widely distributed in plants such as lemon, gooseberry, raspberry and grape juice. Because of its pleasant sour taste, refreshing taste, no aftertaste, safety and non-toxicity, it is currently the most important edible organic acid with the largest production and consumption in the world. It is an important organic acid product widely used in industries such as medicine, food, beverage and washing. [0003] At present, the production process of citric acid mainly includes traditional calcium salt method, ion exchange method and extraction method. [0004] The traditional calcium salt method consumes a lot of sulfuric acid and calcium carbonate, and emits a lot of CO 2 and gypsum and other wastes. Disposing of these wet gypsums not only creat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/47
Inventor 张军华熊结青胡富贵王浩
Owner COFCO BIOTECHNOLOGY CO LTD
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