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A kind of production method of anhydrous citric acid crystal

Anhydrous citric acid, production method technology, applied in organic chemical methods, separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve problems such as low content of ultra-fine anhydrous citric acid crystals, and achieve difficult agglomeration , The effect of easy long-term preservation

Active Publication Date: 2018-09-11
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the content of superfine anhydrous citric acid crystals is low in the anhydrous citric acid crystal products in the prior art, and provide a kind of production method of anhydrous citric acid crystals

Method used

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  • A kind of production method of anhydrous citric acid crystal

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Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment is used to illustrate the production method of anhydrous citric acid crystal of the present invention

[0034] (1) will 8m 3 The continuous injection of citric acid material with a citric acid content of 69% by weight has an effective volume of 8m 3 In the crystallizer, and the temperature of evaporative crystallization is controlled by heating to 60°C for evaporative crystallization. When the supersaturation of the citric acid feed liquid is 1.08, anhydrous lemons with a particle size of 1900 mesh are added to the citric acid feed liquid at one time. Acid seed crystal 760g, stop heating, keep warm for 0.5 hours, then continue heating to control the temperature of evaporative crystallization to 60°C for evaporative crystallization for 1.5 hours, and then discharge;

[0035] (2) Unloading 4m 3 Citric acid crystal slurry and within 10 minutes, the citric acid feed liquid that citric acid content is 69% by weight is injected into crystallizer effective vo...

Embodiment 2

[0039] This embodiment is used to illustrate the production method of anhydrous citric acid crystal of the present invention

[0040] (1) will 8m 3 The continuous injection of citric acid material with a citric acid content of 72% by weight has an effective volume of 8m 3 In the crystallizer, and the temperature of evaporative crystallization is controlled by heating to 65°C for evaporative crystallization. When the supersaturation of the citric acid feed liquid is 1.05, anhydrous lemons with a particle size of 2000 meshes are added to the citric acid feed liquid at one time. Acid seed crystal 800g, stop heating, keep warm for 1 hour, then continue heating to control the temperature of evaporative crystallization to 65°C for evaporative crystallization for 1.8 hours, and then discharge.

[0041] (2) Unloading 5.3m 3 Citric acid crystal slurry and in 10 minutes, the citric acid feed liquid that citric acid content is 72% by weight is injected into crystallizer effective volum...

Embodiment 3

[0045] This embodiment is used to illustrate the production method of anhydrous citric acid crystal of the present invention

[0046] (1) will 8m 3 The continuous injection of citric acid material with a citric acid content of 65% by weight has an effective volume of 8m 3 In the crystallizer, and the temperature of evaporative crystallization is controlled by heating to 44°C for evaporative crystallization. When the supersaturation of the citric acid feed liquid is 1.10, anhydrous lemons with a particle size of 1800 meshes are added to the citric acid feed liquid at one time. Acid seed crystal 720g, stop heating, keep warm for 0.7 hours, then continue heating to control the temperature of evaporative crystallization to 44°C for evaporative crystallization for 1.2 hours, and then discharge;

[0047] (2) Feeding 4.5m 3 Citric acid crystal slurry and in 10 minutes, the citric acid feed liquid that citric acid content is 65% by weight is injected into crystallizer effective volu...

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Abstract

The invention relates to a production method of anhydrous citric acid crystals. The method comprises the steps that citric acid feed liquid is subjected to evaporative crystallization through heating, anhydrous citric acid seed crystals are added into the citric acid feed liquid when the degree of supersaturation of the citric acid feed liquid ranges from 1.02 to 1.13, heating is stopped, heat preservation is conducted for 0.5 h to 1 h, heating is continuously conducted for evaporative crystallization for 1 h to 2 h, and material discharge is conducted, wherein the granularities of the anhydrous citric acid seed crystals range from 1,600 meshes to 2,200 meshes. By means of the method, the content of superfine anhydrous citric acid crystals in the obtained anhydrous citric acid crystals can be increased, and the anhydrous citric acid crystal products are not prone to caking in air and can be easily preserved for a long time.

Description

technical field [0001] The invention relates to a production method of anhydrous citric acid crystals. Background technique [0002] At present, the production method of anhydrous citric acid in industry is as follows: 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 by hydrogen-calcium method or calcium salt method, acid hydrolysis, and decolorization. The solution is heated and concentrated, and the above-mentioned concentrated citric acid feed liquid is continuously injected into the crystallizer, and the citric acid concentrated solution is supersaturated by evaporation, and the solution is naturally crystallized, and then the citric acid solution is added while evaporating, when the solid content (no When water citric acid crystals) accounted for 46-60% by weight of the mixture gross weight of citric acid solution and solids, start to continuously quanti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/43C07C59/265
CPCC07B2200/13C07C51/43C07C59/265
Inventor 罗虎周勇许贵珍满云王建国
Owner COFCO BIOTECHNOLOGY CO LTD