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Citric acid monohydrate crystal and production method thereof

A technology of citric acid and crystals, applied in the field of citric acid monohydrate crystals, which can solve the problems of uneven particle size and wide particle size distribution of citric acid monohydrate crystals

Active Publication Date: 2012-12-26
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the invention of the present invention is to provide a kind of production method of citric acid monohydrate crystal with higher particle uniformity and obtained by the method for the inhomogeneous citric acid monohydrate crystal particles obtained in the prior art, and the defects of wide particle size distribution. citric acid monohydrate crystals

Method used

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  • Citric acid monohydrate crystal and production method thereof

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Effect test

Embodiment 1

[0037] will be 13m 3 The concentration of citric acid is 38.7% by weight, the purity of citric acid is 99% by weight, and the density is 1147kg / m 3 The citric acid solution was heated and concentrated at 60° C. until the concentration of citric acid was 72% by weight to obtain a citric acid concentrate. Put the citric acid concentrate in the crystallization tank, control the temperature difference between the cooling water passing into the jacket of the crystallization tank and the citric acid concentrate in the crystallization tank to be 15°C, and control the cooling rate to 10°C / h, when the temperature drops to 36.6°C At this time, the temperature difference between the cooling water passed into the jacket of the crystallization tank and the citric acid concentrate in the crystallization tank is controlled to be 10°C, the cooling rate is controlled to be 6°C / h, and the temperature is lowered to 10°C, and the obtained citric acid crystal slurry is Carry out centrifugation, c...

Embodiment 2

[0039] will be 13m 3 The concentration of citric acid is 38.7% by weight, the purity of citric acid is 99% by weight, and the density is 1147kg / m 3 The citric acid solution was heated and concentrated at 60° C. until the concentration of citric acid was 72% by weight to obtain a citric acid concentrate. Put the citric acid concentrate in the crystallization tank, control the temperature difference between the cooling water in the jacket of the crystallization tank and the citric acid concentrate in the crystallization tank to be 15°C, and control the cooling rate to 10°C / h, when the temperature drops to 36.6°C At this time, the temperature difference between the cooling water passed into the jacket of the crystallization tank and the citric acid concentrate in the crystallization tank was controlled to be 10°C, the cooling rate was controlled to be 4°C / h, and the temperature was lowered to 15°C, and the obtained citric acid crystal slurry was Carry out centrifugation, control...

Embodiment 3

[0041] will be 13m 3 The concentration of citric acid is 38.7% by weight, the purity of citric acid is 99% by weight, and the density is 1147kg / m 3 The citric acid solution was heated and concentrated at 80° C. until the concentration of citric acid was 70% by weight to obtain a citric acid concentrate. Put the citric acid concentrate in the crystallization tank, control the temperature difference between the cooling water in the jacket of the crystallization tank and the citric acid concentrate in the crystallization tank to be 15°C, and control the cooling rate to 10°C / h, when the temperature drops to 36.6°C At this time, the temperature difference between the cooling water passed into the jacket of the crystallization tank and the citric acid concentrate in the crystallization tank was controlled to be 4°C, and the cooling rate was controlled to be 2°C / h; the temperature was lowered to 10°C, and the obtained citric acid crystal slurry was Carry out centrifugation, control ...

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Abstract

The invention discloses a production method of a citric acid monohydrate crystal, which comprises the following steps: heating a citric acid solution until the citric acid solution is concentrated to the concentration of 68.5-78 wt%, thereby obtaining a citric acid concentrated solution; and cooling to crystallize the citric acid concentrated solution, and carrying out solid-liquid separation on the crystal slurry containing citric acid monohydrate crystal, wherein the cooling for crystallization is carried out under the following conditions: controlling the temperature difference between the cooling medium and the citric acid concentrated solution to be not greater than 10 DEG C under the conditions capable of at least generating citric acid monohydrate crystal. The invention also provides a citric acid monohydrate crystal produced by the method. On the premise of not influencing the product purity and not increasing the techniques, the method disclosed by the invention obviously enhances the particle uniformity of the citric acid monohydrate crystal, so that the 10-20-mesh weight distribution of the citric acid monohydrate crystal can be enhanced to higher than 68%.

Description

technical field [0001] The invention relates to a method for producing citric acid monohydrate crystals and citric acid monohydrate crystals produced by the method. Background technique [0002] Citric acid monohydrate is mainly used in food and beverage industries as sour agent, flavoring agent, preservative and preservative. It is also used as antioxidant, plasticizer and detergent in chemical industry, cosmetic industry and washing industry. At present, the industrial production method of citric acid monohydrate crystals includes: first, the citric acid fermentation liquid is separated from the solid and liquid to obtain the citric acid clear liquid, and the citric acid clear liquid is purified through the calcium salt method (calcium hydrogen method), acid hydrolysis, and decolorization. The solution is heated and concentrated, and the concentration of the concentrated solution is controlled to be 68.5-72% by weight. The above-mentioned citric acid concentrated solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/43
Inventor 张军华满云许贵珍周维英冯志菲
Owner COFCO BIOTECHNOLOGY CO LTD
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