Citric acid crystal and production method thereof

A production method and technology of citric acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of high energy consumption, polycrystalline citric acid crystals, uneven particle size and the like

Inactive Publication Date: 2013-06-12
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of many citric acid crystal polycrystals, uneven particle size, and high energy consumption in the existing method for producing citric acid ...

Method used

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  • Citric acid crystal and production method thereof
  • Citric acid crystal and production method thereof
  • Citric acid crystal and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Concentrate and crystallize multiple batches of citric acid feed liquid in 4 sequentially arranged crystallizers (1#, 2#, 3# and 4#), and put each batch of crystal slurry liquid obtained by concentrated crystallization into the same solid-liquid separation system solid-liquid separation in sequence;

[0053] Among them, the latter crystallizer of 4# crystallizer is the 1# crystallizer, and the time when the latter crystallizer starts to concentrate and crystallize among the two adjacent crystallizers is controlled, so that the time when the latter crystallizer ends the concentrated crystallization and the solid-liquid separation system The time difference between the end of the crystal slurry liquid obtained in the previous crystallizer is not more than 3min (the time required for the concentration and crystallization of each batch of citric acid feed liquid is 6h, and the time required for the liquid-solid-liquid separation of each batch of crystal slurry is 2h. When t...

Embodiment 2

[0056] Concentrate and crystallize multiple batches of citric acid feed liquid in 4 sequentially arranged crystallizers (1#, 2#, 3# and 4#), and put each batch of crystal slurry liquid obtained by concentrated crystallization into the same solid-liquid separation system solid-liquid separation in sequence;

[0057] Among them, the latter crystallizer of 4# crystallizer is the 1# crystallizer, and the time when the latter crystallizer starts to concentrate and crystallize among the two adjacent crystallizers is controlled, so that the time when the latter crystallizer ends the concentrated crystallization and the solid-liquid separation system The time difference between the end of the crystal slurry liquid obtained in the previous crystallizer is not more than 3min (the time required for the concentration and crystallization of each batch of citric acid feed liquid is 6h, and the time required for the liquid-solid-liquid separation of each batch of crystal slurry is 2h. When t...

Embodiment 3

[0060] Concentrate and crystallize multiple batches of citric acid feed liquid in 4 sequentially arranged crystallizers (1#, 2#, 3# and 4#), and put each batch of crystal slurry liquid obtained by concentrated crystallization into the same solid-liquid separation system solid-liquid separation in sequence;

[0061] Among them, the latter crystallizer of 4# crystallizer is the 1# crystallizer, and the time when the latter crystallizer starts to concentrate and crystallize among the two adjacent crystallizers is controlled, so that the time when the latter crystallizer ends the concentrated crystallization and the solid-liquid separation system The time difference between the end of the crystal slurry liquid obtained in the previous crystallizer is not more than 3min (the time required for the concentration and crystallization of each batch of citric acid feed liquid is 6h, and the time required for the liquid-solid-liquid separation of each batch of crystal slurry is 2h. When t...

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Abstract

The invention discloses a citric acid crystal and a production method thereof. The method comprises the steps of concentrating and crystallizing multiple batches of citric acid feed liquid in sequence under the concentration and crystallization conditions, and carrying out solid-liquid separation on the crystal size obtained through concentration and crystallization in sequence in the same solid-liquid separation system, wherein the start time of concentration and crystallization of the latter batch of two adjacent batches of citric acid feed liquid is controlled so that the finish time of concentration and crystallization of the latter batch of citric acid feed liquid is not earlier than the finish time of separation of the former batch of crystal size by the solid-liquid separation system. According to the invention, as batch production is adopted, the problems in continuous production that as part of the crystals has long residence time in the system, the crystals seriously collide with each other and generate polycrystals, thus causing more polycrystals and nonuniform crystal grains of the crystal product, high moisture content, poor anti-caking performance and low bulk density do not exist. By adopting the technical scheme, the solid-liquid separation system can be ensured to work continuously, the production efficiency is improved and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a production method of citric acid crystals, in particular to a production method especially suitable for anhydrous citric acid crystals and citric acid crystals prepared by the method. Background technique [0002] The continuous production method of anhydrous citric acid in industry comprises at present: first citric acid fermented liquid is obtained through solid-liquid separation to obtain citric acid supernatant liquid, citric acid supernatant liquid is precipitated with hydrogen-calcium method or calcium salt method, acid hydrolyzes precipitate, to The acid hydrolysis product is decolorized, the decolorized solution is heated and concentrated, and the obtained concentrated citric acid feed solution is continuously injected into the crystallizer, and the citric acid concentrated solution reaches a supersaturated state through evaporation, and the solution crystallizes naturally, and then lemon is added Acid solution limit ...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/43
Inventor 李北周勇熊结青许贵珍王建国
Owner COFCO BIOTECHNOLOGY CO LTD
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