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Anhydrous citric acid crystal and production method thereof

A technology of anhydrous citric acid and its production method, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., and can solve the problems of reduced adhesion of anhydrous citric acid crystals and easy adhesion of anhydrous citric acid crystals

Inactive Publication Date: 2013-03-20
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the invention of the present invention is to provide a kind of production method of anhydrous citric acid crystal and the anhydrous citric acid crystal obtained by the method for the problem that the anhydrous citric acid crystal produced by the method of the prior art is easy to stick together, by The adhesion of anhydrous citric acid crystals produced by the method is significantly reduced, and the crystal quality is good

Method used

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  • Anhydrous citric acid crystal and production method thereof
  • Anhydrous citric acid crystal and production method thereof
  • Anhydrous citric acid crystal and production method thereof

Examples

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Embodiment 1

[0038] will be 5m 3 A citric acid solution with a citric acid concentration of 45% by weight and a citric acid purity of 99% by weight is obtained by concentrating a three-effect evaporation (the first-effect evaporation temperature is 93°C, the second-effect evaporation temperature is 74°C, and the third-effect evaporation temperature is 55°C). Anhydrous citric acid crystal content is 30% by weight crystal slurry liquid, then placed in the crystallization tank, in the crystallization tank jacket, feed cooling water to cool down, the cooling rate is 3 ° C / h, when the temperature of the crystal slurry liquid is 37 ° C When solid-liquid separation is carried out, the ambient temperature during solid-liquid separation is controlled so that the temperature of the wet crystal obtained after separation is 38°C, and the wet crystal is dried at 40°C for 27 minutes to obtain a crystal product. The content of anhydrous citric acid crystals in the obtained crystal product was 99.8% by ...

Embodiment 2

[0040] will be 5m 3 A citric acid solution with a citric acid concentration of 30% by weight and a citric acid purity of 99% by weight is obtained by concentrating a three-effect evaporation (the first-effect evaporation temperature is 100°C, the second-effect evaporation temperature is 79°C, and the third-effect evaporation temperature is 65°C). Anhydrous citric acid crystal content is the crystal slurry liquid of 5% by weight, then placed in the crystallization tank, in the crystallization tank jacket, feed cooling water to cool down, the cooling rate is 4 ° C / h, when the temperature of the crystal slurry liquid is 40 ° C When solid-liquid separation is carried out, the ambient temperature during solid-liquid separation is controlled so that the temperature of the wet crystal obtained after separation is 38°C, and the wet crystal is dried at 60°C for 9 minutes to obtain a crystal product. The content of anhydrous citric acid crystals in the obtained crystal product was 99....

Embodiment 3

[0042] will be 5m 3 A citric acid solution with a citric acid concentration of 60% by weight and a citric acid purity of 99% by weight is obtained by concentrating through three-effect evaporation (the first-effect evaporation temperature is 90°C, the second-effect evaporation temperature is 71°C, and the third-effect evaporation temperature is 50°C). Anhydrous citric acid crystal content is 60% by weight crystal slurry liquid, then placed in the crystallization tank, cooling water is passed into the crystallization tank jacket to cool down, the cooling rate is 4 ° C / h, when the crystal slurry liquid is cooled to 37 ° C , when the solid-liquid separation is controlled, the ambient temperature is consistent with the crystal slurry temperature to carry out constant-temperature solid-liquid separation, and the wet crystal is dried at 50° C. for 15 minutes to obtain a crystal product. The content of anhydrous citric acid crystals in the obtained crystal product was 99.8% by weig...

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Abstract

The invention provides a production method of anhydrous citric acid crystal. The production method comprises the following steps in sequence: evaporating and crystallizing citric acid solution; and carrying out solid-liquid separation on the crystal size containing an anhydrous citric acid crystal, so as to obtain a wet anhydrous citric acid crystal, wherein the temperature of the wet anhydrous citric acid crystal which is obtained by separating under the solid-liquid separation condition is not less than X to 5 DEG C and higher than 36.6 DEG C, and X DEG C is the temperature of the crystal size to be treated by solid-liquid separation. The invention also provides the anhydrous citric acid crystal prepared by the production method provided by the invention. According to the production method provided by the invention, the adhesion of the anhydrous citric acid crystal can be obviously reduced while the purity of the anhydrous citric acid crystal is not influenced and the process is not increased.

Description

technical field [0001] The invention relates to a production method of anhydrous citric acid crystals and anhydrous citric acid crystals produced by the method. Background technique [0002] With the advancement of biotechnology, the citric acid industry has developed by leaps and bounds, and the world's citric acid production has reached 4 million tons per year. Citric acid is widely used in industry, food industry, cosmetic industry and medicine and other industries. The most important use of citric acid in the food industry is as a sour agent; it can be used as a chemical analysis reagent, experimental reagent, chromatographic analysis reagent and biochemical reagent in industry. When citric acid is used as an experimental reagent, it can be used as a complexing agent, a masking agent, and used to prepare buffer solutions. For example, a citric acid-sodium citrate buffer for flue gas desulfurization can be prepared. When citric acid is used as a biochemical reagent, ci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/43
Inventor 周勇熊结青顾宗池王勇陈静文
Owner COFCO BIOTECHNOLOGY CO LTD
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