Production method for citric acid monohydrate crystal

A production method and technology of anhydrous citric acid are applied in the production field of citric acid monohydrate crystals, and can solve the problems of low crystallization rate, poor anti-caking performance, wide particle size distribution, etc., so as to improve the crystallization rate and anti-caking performance effect

Active Publication Date: 2011-11-09
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The crystallization rate is low, about 48% based on the amount of citric acid monohydrate in the citric acid concentrate
[0005] 2. The particles are uneven and small, and the particle size distribution is wide, resulting in poor anti-caking performance

Method used

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  • Production method for citric acid monohydrate crystal
  • Production method for citric acid monohydrate crystal
  • Production method for citric acid monohydrate crystal

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment is used to illustrate the production method of the citric acid monohydrate crystal provided by the present invention.

[0032] (1) the concentration of citric acid is 38.7% by weight, the purity of citric acid is greater than 99% by weight, and the density is 1147kg / m 3 citric acid solution 5m 3 It heated and concentrated at 80 degreeC until the concentration of citric acid became 77.4 weight%, and obtained the citric acid concentrate.

[0033](2) The above-mentioned citric acid concentrated solution is continuously sent into the crystallization tank, and the crystallization is carried out in the crystallization tank. 200 mesh anhydrous citric acid seed crystals 50g (purity is 99.6% by weight); adding 1.0kg citric acid monohydrate seed crystals of 80-200 mesh with a speed of 4-6°C / h when the temperature is down to 36°C, And cool down after being incubated at this temperature for 1 hour;

[0034] (3) After the product obtained in step (2) is cooled to ...

Embodiment 2

[0037] This embodiment is used to illustrate the production method of the citric acid monohydrate crystal provided by the present invention.

[0038] (1) the concentration of citric acid is 38.1% by weight, the purity of citric acid is greater than 99% by weight, and the density is 1142kg / m 3 citric acid solution 5m 3 It heated and concentrated at 60 degreeC until the concentration of citric acid became 72.1 weight%, and obtained the citric acid concentrate.

[0039] (2) The concentrated solution of citric acid enters the crystallization tank continuously, and carries out cooling and crystallization in the crystallization tank. Water citric acid crystal seed 50g (purity is 99.8% by weight); With the speed of 4-6 DEG C / h temperature is dropped to 36 DEG C, adding granularity is 80-200 purpose monohydrate citric acid crystal seed 0.78kg, and in this Lower the temperature after keeping warm for 1 hour at high temperature;

[0040] (3) When the product obtained in step (2) was ...

Embodiment 3

[0043] This embodiment is used to illustrate the production method of the citric acid monohydrate crystal provided by the present invention.

[0044] (1) the concentration of citric acid is 38.7% by weight, the purity of citric acid is greater than 99% by weight, and the density is 1147kg / m 3 citric acid solution 5m 3 It heated and concentrated at 98 degreeC until the concentration of citric acid became 84 weight%, and obtained the citric acid concentrate.

[0045] (2) The concentrated solution of citric acid enters the crystallization tank continuously, and crystallization is carried out in the crystallization tank. When the temperature of the concentrated solution is lowered to 88 °C (the degree of supersaturation is 1.17) at 10 °C / h, add a particle size of 80-200 mesh Water citric acid crystal seed 50g (purity is 99.8% by weight); Add particle size and be 80-200 object monohydrate citric acid crystal seed 1.11kg when temperature is dropped to 36 ℃ with the speed of 5 ℃ / h, ...

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Abstract

The invention provides a production method for a citric acid monohydrate crystal. The method is characterized in that: the method comprises the following steps: (1) carrying out heating and condensing for a citric acid solution at a temperature of 50-100 DEG C until a citric acid concentration of the citric acid solution is 68.5-84 wt% to obtain a citric acid concentrated solution; (2) cooling the citric acid concentrated solution from the step (1), adding anhydrous citric acid crystal seed to the citric acid concentrated solution during the cooling process, wherein the citric acid concentrated solution is in a supersaturated state and has a temperature higher than 36.6 DEG C; continuously cooling and adding citric acid monohydrate crystal seed, wherein the temperature of the citric acid concentrated solution is lower than a crystallization temperature of the citric acid monohydrate, and is higher than or equal to a temperature of 10 DEG C; (3) carrying out a solid-liquid separation for the resulting products from the step (2) to obtain a citric acid monohydrate wet crystal and a citric acid crystal mother solution. According to the method provided by the present invention, the produced citric acid monohydrate crystal has a characteristic of uniform and massive particles, and a crystallization ratio is up to 70%.

Description

technical field [0001] The invention relates to a production method of citric acid monohydrate crystals. Background technique [0002] Citric acid monohydrate crystals are mainly used in the food and beverage industries as sour agents, flavoring agents, preservatives, and preservatives. 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: firstly, the citric acid fermentation liquid is separated from the solid and liquid to obtain the citric acid clear liquid; , control the temperature of the citric acid concentrate to be 55-65° C., the concentration of the concentrate to be 68.5-72% by weight, send the above-mentioned citric acid concentrate into a crystallization tank, make the citric acid concentrate reach a supersaturated state by cooling, and cool down to Add anhydrous citric acid seed crystals with a particle si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/265C07C51/43
Inventor 满云许贵珍陈影周维英
Owner COFCO BIOTECHNOLOGY CO LTD
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