A kind of method for purifying citric acid from citric acid liquid

A citric acid solution and citric acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of the inability to increase the utilization rate of the resin, increase the number of resin regenerations, and increase the amount of waste liquid discharge, etc., to achieve saving Effects of enrichment cost, consumption reduction, and emission reduction

Active Publication Date: 2019-11-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only leads to the inability to improve the utilization rate of the resin, but the output of citric acid is low, and the number of regenerations of the resin increases, resulting in a reduction in the life of the resin, an increase in the discharge of waste liquid, and more serious environmental pollution.

Method used

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  • A kind of method for purifying citric acid from citric acid liquid
  • A kind of method for purifying citric acid from citric acid liquid
  • A kind of method for purifying citric acid from citric acid liquid

Examples

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Embodiment 1

[0033] A method for purifying citric acid from a citric acid solution, the citric acid solution containing citric acid, chloride ions and sulfate ions, the method comprising the following steps:

[0034] (1) First, open the feed valve 4 and the discharge valve 8;

[0035] (2) Then, turn on the constant flow pump 2, and remove the citric acid solution (with citric acid mass concentration of 10%, sulfate ion concentration of 1g / L, and chloride ion concentration of 0.5g / L) from the raw material at a flow rate of 0.1L / h The liquid storage tank 1 enters the ion exchange column 5 through the feed pipe 3;

[0036] (3) Then, citric acid flows into the pre-set product storage tank 10 through the discharge valve 9;

[0037] (4) Finally, measure the chloride ion and sulfate ion concentration in the effluent of the discharge pipe 9 every 10 mL, stop collecting citric acid when the chloride ion concentration in the solution is higher than 6 mg / L, and close the outlet valve 8, constant flow Pump 2...

Embodiment 2

[0043] A method for purifying citric acid from a citric acid solution, the citric acid solution containing citric acid, chloride ions and sulfate ions, the method comprising the following steps:

[0044] (1) First, open the feed valve 4 and the discharge valve 8;

[0045] (2) Then, turn on the constant flow pump 2, and remove the citric acid solution (with citric acid mass concentration of 15%, sulfate ion concentration of 3g / L, chloride ion concentration of 1g / L) from the raw material solution at a flow rate of 0.3L / h The storage tank 1 enters the ion exchange column 5 through the feed pipe 3;

[0046] (3) Then, citric acid flows into the pre-set product storage tank 10 through the discharge valve 9;

[0047] (4) Finally, measure the chloride ion and sulfate ion concentration in the effluent of the discharge pipe 9 every 10 mL, stop collecting citric acid when the chloride ion concentration in the solution is higher than 6 mg / L, and close the outlet valve 8, constant flow Pump 2, fe...

Embodiment 3

[0053] A method for purifying citric acid from a citric acid solution, the citric acid solution containing citric acid, chloride ions and sulfate ions, the method comprising the following steps:

[0054] (1) First, open the feed valve 4 and the discharge valve 8;

[0055] (2) Then, turn on the constant flow pump 2, and transfer the citric acid solution (in which the mass concentration of citric acid is 20%, the concentration of sulfate ion is 5g / L, and the concentration of chloride ion is 2g / L) from the raw material solution at a flow rate of 0.4L / h The storage tank 1 enters the ion exchange column 5 through the feed pipe 3;

[0056] (3) Then, citric acid flows into the pre-set product storage tank 10 through the discharge valve 9;

[0057] (4) Finally, measure the chloride ion and sulfate ion concentration in the effluent of the discharge pipe 9 every 10 mL, stop collecting citric acid when the chloride ion concentration in the solution is higher than 6 mg / L, and close the outlet val...

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Abstract

The invention discloses a method for purifying citric acid in a citric acid solution. The citric acid solution contains citric acid, chloride ions and sulfate ions. The method comprises the step of introducing the citric acid solution to flow through an ion exchange column to remove impurity ions in the citric acid solution, so as to obtain citric acid with relatively high purity. According to the preparation method, the yield of citric acid and the utilization rate of the ion exchange column can be substantially increased when the concentration and purity of citric acid are guaranteed, besides, the service life of resin can be prolonged, the wear and expense of equipment are reduced, the use amount of regenerated liquid is reduced, and the environmental pollution is reduced.

Description

Technical field [0001] The invention relates to the technical field of preparation of citric acid, in particular to a treatment process for purifying citric acid by using anion exchange resin. Background technique [0002] Citric acid is the world's largest fermented product. It is safe, non-toxic, and has good solubility. It has the characteristics of sour taste and pH adjustment. It is widely used as a sour agent and antioxidant in food and beverages. The application scope of citric acid also involves pharmaceutical and other industrial fields, and is used as a pH regulator, bleaching agent, fixative and stabilizer. [0003] At present, domestic manufacturers widely use calcium salt method to purify citric acid in fermentation broth. First, citric acid and CaCO in the fermentation broth 3 Or Ca(OH) 2 Reaction, filtered to obtain calcium citrate which is soluble in acid but insoluble in water, and then use H 2 SO 4 Acidolysis of calcium citrate realizes the separation of citric a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/47C07C59/265
CPCC07C51/47C07C59/265
Inventor 张军伟宋乾宁刘志维彭奇均朱程旭
Owner JIANGNAN UNIV
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