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A kind of processing method containing citric acid solution

A citric acid solution and treatment method technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of high production cost, large amount of waste liquid, small amount of adsorbed citric acid, etc., and reduce the cost of environmental protection treatment , Reduce energy consumption, improve the effect of purity and concentration

Active Publication Date: 2011-11-30
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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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  • A kind of processing method containing citric acid solution
  • A kind of processing method containing citric acid solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Decolorization: after the 1120L obtained after centrifugation, the citric acid clear liquid with a content of 14.2% by weight was passed through the GH-15 carbon column at a flow rate of 1.8 times the column volume / hour, and the carbon column was carried out with 80L of deionized water. Rinse to obtain 1200L of effluent A1, the content of citric acid in the effluent A1 is 13% by weight, the light transmittance of the effluent A1 is 85%, and the temperature during decolorization is 50 ° C;

[0055] (2) adjusting pH: the pH of effluent A1 is adjusted to 2.0 with sodium hydroxide to obtain solution B1;

[0056] (3) ion-exchange chromatographic separation: the effluent B1 is introduced into a chromatographic system with a built-in selective separation resin (weakly basic anion-exchange resin SQD815) in a co-current manner for chromatographic separation;

[0057] The operating conditions are, adsorption zone: effluent B1 is introduced from the upper end of the resin colu...

Embodiment 2

[0070] (1) Decolorization: 850L of the citric acid clear liquid obtained after centrifugation with a content of 17.9% by weight is passed through the GH-11 carbon column at a flow rate of 1.5 times the column volume / hour, and the carbon column is carried out with 70L of deionized water. Rinse, obtain the effluent A2 of 920L, the content of citric acid in the effluent A2 is 16.3% by weight, the light transmittance of the effluent A2 is 82%, and the working temperature during decolorization is 55 ℃;

[0071] (2) adjust pH: the pH of effluent A2 is adjusted to 2.5 with sodium hydroxide to obtain solution B2;

[0072] (3) ion-exchange chromatographic separation: the effluent B2 is introduced into a chromatographic system with a built-in selective separation resin (weakly basic anion-exchange resin SQD815) in a co-current manner for chromatographic separation;

[0073] The operating conditions are, adsorption zone: effluent B2 is introduced from the upper end of the resin column gr...

Embodiment 3

[0079] (1) Decolorization: 1150L of the citric acid clear liquid obtained after centrifugation with a content of 16.6 wt % was passed through the GH-15 carbon column at a flow rate of 2.0 times the column volume / hour, and the carbon column was carried out with 100L of deionized water. Rinse, obtain the effluent A3 of 1250L, the content of citric acid in the effluent A3 is 15.1% by weight, the light transmittance of the effluent A3 is 83%, and the working temperature during decolorization is 40 ℃;

[0080] (2) adjust pH: the pH of effluent A3 is adjusted to 3.0 with sodium hydroxide to obtain solution B3;

[0081] (3) ion-exchange chromatographic separation: the effluent B3 is introduced into the chromatographic system of the built-in selective separation resin (weakly basic anion-exchange resin SQD816) in a co-current manner to carry out chromatographic separation;

[0082] The operating conditions are, adsorption zone: effluent B3 is introduced from the upper end of the resin...

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Abstract

The invention provides a treatment method of a citric acid contained solution, wherein the method comprises the following steps of: (1) enabling the citric acid contained solution to flow through an active carbon column and contact active carbon in the active carbon column so as to obtain an effluent liquid A, wherein the light transmission rate of the effluent liquid A is more than 60% through the contacting condition; (2) regulating the pH value of the effluent liquid A obtained in the step (1) to be 2-5 so as to obtain a solution B; and (3) enabling the effluent liquid B to contact multiple anion exchange resin column groups so as to carry out ion exchange chromatography separation, wherein each anion exchange resin column group passes through an adsorption area, a purification area, an elution area and a regeneration area in sequence in circulation so that the anion exchange resin column group is exchanged, adsorbed, purified, eluted and regenerated in sequence in circulation. The citric acid contained solution is treated by using the method provided by the invention so that citric acid with high purity and high yield can be obtained within a unit time in an environment friendly and energy saving way.

Description

technical field [0001] The invention relates to a treatment method of a citric acid-containing solution. Background technique [0002] Citric acid, also known as citric acid, chemical name is 2-hydroxypropane tricarboxylic acid. Widely distributed in plants such as lemons, gooseberries, raspberries and grape juice. Because of its pleasant sour taste, refreshing entrance, no after-sour taste, safe and non-toxic, it is currently the largest and most important edible organic acid in the world in terms of production and consumption. It is an important organic acid product widely used in medicine, food, beverage and washing industries. [0003] At present, the production process of citric acid mainly includes traditional calcium salt method, ion exchange method and extraction method. The traditional calcium salt method consumes a lot of sulfuric acid and calcium carbonate, and emits a lot of CO 2 and gypsum waste. Disposing of this wet gypsum not only places a heavy burden o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/47
Inventor 陈修周勇胡富贵熊结青廖四祥
Owner COFCO BIOTECHNOLOGY CO LTD
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