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Long-chain dibasic acid continuous crystallization equipment, system and continuous crystallization method

A long-chain dibasic acid and crystallization technology, applied in the field of long-chain dibasic acid continuous crystallization equipment, can solve the problems of irregular crystal form, uneven color and size, and achieve good crystal form, uniform color, Uniform size and shape

Active Publication Date: 2021-09-28
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a long-chain dibasic acid in order to solve the problems of irregular crystal form, uneven size, shape, and color caused by material aggregation and rapid cooling during the crystallization process of the existing long-chain dibasic acid. Continuous crystallization equipment, system and continuous crystallization method of basic acid

Method used

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  • Long-chain dibasic acid continuous crystallization equipment, system and continuous crystallization method
  • Long-chain dibasic acid continuous crystallization equipment, system and continuous crystallization method
  • Long-chain dibasic acid continuous crystallization equipment, system and continuous crystallization method

Examples

Experimental program
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Effect test

Embodiment 1

[0092] Compare the membrane filtration method disclosed in the patent document CN1570124A to prepare DC12 membrane supernatant, add sulfuric acid with a mass concentration of 97% to adjust the pH value to 3.0, filter, wash, and dry to obtain the crude long-chain dibasic acid (moisture<1%). Add 92% acetic acid solution with a concentration of 3 times the weight of long-chain dibasic acid, stir, keep the temperature at 92° C., add 3% activated carbon for decolorization (relative to the weight ratio of long-chain dibasic acid), and filter with plate and frame to obtain clear liquid.

[0093] In the continuous crystallization device equipped with an external circulation device, add a 30°C discharge magma (obtained by batch crystallization) in advance, and then start the circulation pump; decolorize the 92°C clear liquid according to the mass ratio of the circulation amount to the feed amount of 30 : 1, through the material inlet provided on the external circulation device, enter th...

Embodiment 2

[0098] Compare the membrane filtration method disclosed in the patent document CN1570124A to prepare DC12 membrane supernatant, add sulfuric acid with a mass concentration of 97% to adjust the pH value to 3.0, filter, wash, and dry to obtain the crude long-chain dibasic acid (moisture<1%). Add 92% acetic acid solution with a concentration of 3 times the weight of long-chain dibasic acid, stir, keep the temperature at 92° C., add 3% activated carbon for decolorization (relative to the weight ratio of long-chain dibasic acid), and filter with plate and frame to obtain clear liquid.

[0099] In the continuous crystallization device equipped with an external circulation device, add a 30°C discharge magma (obtained by batch crystallization) in advance, and then start the circulation pump; decolorize the 92°C clear liquid according to the mass ratio of the circulation amount to the feed amount of 200 : 1, through the material inlet provided on the external circulation device, enter t...

Embodiment 3

[0102] Compare the membrane filtration method disclosed in the patent document CN1570124A to prepare DC12 membrane supernatant, add sulfuric acid with a mass concentration of 97% to adjust the pH value to 3.0, filter, wash, and dry to obtain the crude long-chain dibasic acid (moisture<1%). Add 92% ethanol solution of 3 times the weight of the long-chain dibasic acid, stir, keep the temperature at 90° C., add 3% activated carbon for decolorization (relative to the weight ratio of the long-chain dibasic acid), and filter with a plate frame to obtain the clear liquid.

[0103] In the continuous crystallization device equipped with an external circulation device, add a 30°C discharge magma (obtained by batch crystallization) in advance, and then start the circulation pump; decolorize the 90°C clear liquid according to the mass ratio of the circulation amount to the feed amount of 100 : 1, through the material inlet provided on the external circulation device, enter the external cir...

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Abstract

The invention discloses a long-chain dibasic acid continuous crystallization equipment, system and continuous crystallization method. The continuous crystallization equipment includes a crystallization device and an external circulation device; the continuous crystallization system includes more than two continuous crystallization equipment; the continuous crystallization method includes the following steps: the long-chain dibasic acid solution is cooled and crystallized, and the crystal slurry is carried out through the external circulation Heat exchange, so that the temperature difference of the crystal slurry before and after the heat exchange is within 3°C. The continuous crystallization method of long-chain dibasic acid of the present invention can avoid the problem of fouling on the heat exchange surface during intermittent crystallization, and at the same time prevent the explosive nucleation caused by rapid cooling, which is beneficial to the growth of long-chain dibasic acid crystals, and obtains The crystal has good crystal form, uniform size and shape, uniform color, and high crystal quality; it avoids the deterioration of the crystallization process, saves crystallization time, improves crystallization efficiency, and occupies a small area of ​​equipment, saving land.

Description

technical field [0001] The invention relates to long-chain dibasic acid continuous crystallization equipment, system and crystallization method. Background technique [0002] Long chain dicarboxylic acids (Long chain dicarboxylic acids) refer to aliphatic dicarboxylic acids (DCn for short) containing 9 or more carbon atoms in the carbon chain, including saturated long chain dicarboxylic acids and unsaturated long chain dicarboxylic acids . As an important fine chemical product, long-chain dibasic acid is widely used in industrial production. An important raw material for coatings, etc. [0003] The synthesis method of long-chain dibasic acid includes chemical method and biological method (microbial fermentation method). In terms of chemical methods, for example, castor oil can be heated and hydrolyzed in the presence of alkali to produce sodium ricinoleic acid soap, which is then acidified with sulfuric acid to generate ricinoleic acid, and then mixed with alkali in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/43C07C55/21B01D9/02
CPCB01D9/0013B01D9/0059B01D2009/0086C07C51/43C07C55/21
Inventor 杨晨秦兵兵刘修才
Owner CATHAY R&D CENT CO LTD