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A kind of drying method of citric acid monohydrate crystal and obtained citric acid crystal monohydrate

A drying method and technology of anhydrous citric acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as easy caking, poor appearance quality, and crystal detachment, so as to improve the color and enhance the combination The effect of improving crystallization water ability and anti-caking ability

Active Publication Date: 2011-11-30
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Easy to agglomerate
[0005] 2. The crystal is severely dehydrated and the crystal shape is irregular
[0006] 3. Poor color and poor appearance quality

Method used

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  • A kind of drying method of citric acid monohydrate crystal and obtained citric acid crystal monohydrate
  • A kind of drying method of citric acid monohydrate crystal and obtained citric acid crystal monohydrate
  • A kind of drying method of citric acid monohydrate crystal and obtained citric acid crystal monohydrate

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Effect test

preparation example Construction

[0032] According to the drying method of the present invention, wherein, in step 1), the preparation method of the citric acid monohydrate crystal slurry can be prepared by methods known to those skilled in the art. Preferably, in order to obtain high crystallization rate and coarse, uniform citric acid monohydrate crystals, the following method is preferably used to prepare citric acid monohydrate crystal slurry, said method comprising:

[0033] (a) heating and concentrating the citric acid solution at 50-100°C until the citric acid concentration is 70-84% by weight to obtain a citric acid concentrate; (b) cooling the citric acid concentrate obtained in step (a) and Add anhydrous citric acid seed crystals to the citric acid concentrated solution when the citric acid concentrated solution is supersaturated. The temperature for adding anhydrous citric acid seed crystals is above 36.6°C; The temperature of the citric acid concentrate when adding the citric acid monohydrate seed ...

Embodiment 1

[0044] This embodiment is used to illustrate the drying method of citric acid monohydrate crystal provided by the present invention.

[0045] 1) (a) 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 Heating and concentrating at 80° C. to a concentration of citric acid is 77.4% by weight to obtain a citric acid concentrate; (b) the above-mentioned citric acid concentrate is continuously sent into a crystallization tank, and the crystallization is carried out in the crystallization tank, and the concentrate is 10 When ℃ / h is cooled to 60 ℃ (supersaturation is 1.19), add particle size and be 85-150 purpose anhydrous citric acid seed crystal 50g (purity is 99.6% by weight); With the speed of 4 ℃ / h the temperature is reduced to Add 1.0 kg of citric acid monohydrate seed crystals with a particle size of 85-150 mesh at 36° C., and keep the temperature at this temperatu...

Embodiment 2

[0051] This embodiment is used to illustrate the drying method of citric acid monohydrate crystal provided by the present invention.

[0052] 1) (a) 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 Heating and concentrating at 60° C. to a concentration of citric acid is 70% by weight to obtain a citric acid concentrate; (b) the citric acid concentrate enters a crystallization tank continuously, and crystallization is carried out in a crystallization tank, and the concentrate is heated at 10° C. / h When the temperature is lowered to 41°C (supersaturation is 1.14), add 50g of anhydrous citric acid seed crystals with a particle size of 85-150 mesh (purity is 99.8% by weight); when the temperature is reduced to 36°C at a speed of 6°C / h Add 0.78 kg of citric acid monohydrate seed crystals with a particle size of 85-150 mesh, and keep the temperature at this temperatu...

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Abstract

The invention provides a method for drying citrate monohydrate crystals and the citrate monohydrate crystals obtained by the method. The method comprises the following steps of: 1) performing solid-liquid separation on crystal slurry containing the citrate monohydrate crystals to obtain wet citrate monohydrate crystals and a crystallized citrate mother solution; and 2) drying and cooling the wet citrate monohydrate crystals obtained in the step 1) at the temperature of between 15 and 36.6DEG C and the relative humidity of less than 65 percent. The citrate monohydrate crystals obtained by the drying method have bright color, the crystal particles have high capacity of bonding crystal water, the anti-caking capacity is obviously improved.

Description

technical field [0001] The invention relates to a method for drying citric acid monohydrate crystals and obtained 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 drying method of citric acid monohydrate crystals in industry includes: first, the citric acid fermentation liquid is separated from the solid and liquid to obtain the citric acid clear liquid, and the purified citric acid clear liquid is subjected to the calcium salt method, the acid hydrolysis method, and decolorization, and then the purified solution is heated and concentrated to 68.5-72% by weight to obtain a crystal slurry liquid containing citric acid monohydrate crystals, then lower the temperature to precipi...

Claims

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Application Information

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IPC IPC(8): C07C59/265C07C51/42
Inventor 张军华陈修许贵珍满云廖四祥
Owner COFCO BIOTECHNOLOGY CO LTD
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