The Refining Technology of Long Carbon Chain Dibasic Acids Produced by Biological Fermentation

A long carbon chain dibasic acid and bio-fermentation technology, which is applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of poor thermal stability, high ash and iron salt content, and low purity, and achieve The effect of expanding the development space, high thermal stability, and high monoacid content

Active Publication Date: 2016-11-09
CATHAY R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the technology adopted by long-chain dibasic acid production enterprises can only produce dibasic acid crude products (called P-grade products), but dibasic acid crude products have low monoacid content, poor thermal stability, low purity, ash and iron The salt content is high, and the product quality cannot meet the quality standard of polymer grade, which cannot meet the high-quality requirements of customers, which greatly limits the application range of long-chain dibasic acids

Method used

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  • The Refining Technology of Long Carbon Chain Dibasic Acids Produced by Biological Fermentation
  • The Refining Technology of Long Carbon Chain Dibasic Acids Produced by Biological Fermentation
  • The Refining Technology of Long Carbon Chain Dibasic Acids Produced by Biological Fermentation

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Embodiment 1

[0017] A refining process for producing long-carbon-chain dibasic acids by biological fermentation. The refining process steps include:

[0018] (1) Decolorization and filtration: Put the dibasic acid crude product into the decolorization tank, the water content is 5wt%, add 0.05wt% activated carbon, the mass ratio of the solvent to the dibasic acid is 3.0:1 when converted into a content of 100%, At a temperature of 85°C, decolorize for 20 minutes and then filter through a plate and frame filter press to obtain a dibasic acid clear solution. The solvent is 90% acetic acid solution.

[0019] (2) Primary crystallization and separation: Put the dibasic acid clear solution obtained in step (1) into a primary crystallization tank, cool down to 75°C, keep it warm for 1 hour, then cool down to 25°C, after the material is completely crystallized, put the crystallization The material is separated by centrifuge.

[0020] (3) High-temperature water crystallization and separation: put t...

Embodiment 2

[0023] A refining process for producing long-carbon-chain dibasic acids by biological fermentation. The refining process steps include:

[0024] (1) Color filtration: Put the dibasic acid crude product into the decolorization tank, the water content is 8wt%, add 0.1wt% activated carbon, the mass ratio of the solvent and the dibasic acid is 2.5: 1 when converted into a content of 100%. At a temperature of 90°C, decolorize for 60 minutes and then filter through a plate and frame filter press to obtain dibasic acid clear liquid. The solvent is 99% acetic acid solution.

[0025] (2) Secondary crystallization and separation: Put the dibasic acid clear liquid obtained in step (1) into a primary crystallization tank, cool down to 80°C, keep it warm for 1.5 hours, then cool down to 30°C, after the material is completely crystallized, put the crystallization The material is separated by centrifuge.

[0026] (3) Warm water crystallization and separation: put the crystallization materi...

Embodiment 3

[0030] A refining process for producing long-carbon-chain dibasic acids by biological fermentation. The refining process steps include:

[0031] (1) Decolorization and filtration: Put the dibasic acid crude product into the decolorization tank, the water content is 12wt%, add 0.2wt% activated carbon, the mass ratio of the solvent and the dibasic acid converted into a content of 100% is 2.0:1, At a temperature of 100°C, decolorize for 90 minutes and then filter through a plate and frame filter press to obtain dibasic acid clear liquid. The solvent is 95% acetic acid solution.

[0032] (2) Primary crystallization and separation: Put the dibasic acid clear liquid obtained in step (1) into a primary crystallization tank, cool down to 85°C, keep it warm for 2 hours, then cool down to 35°C, and after the material is completely crystallized, put the crystallization The material is separated by centrifuge.

[0033] (3) High-temperature water crystallization and separation: put the c...

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Abstract

The invention belongs to the technical field of preparing long carbon chain dibasic acid by biological fermentation method, and particularly relates to a refining process for producing long carbon chain dibasic acid by biological fermentation method. The technical scheme of the present invention is: a refining process for producing long carbon chain dibasic acid by biological fermentation, and the refining process steps include: (1) decolorization and filtration; (2) primary crystallization and separation; (3) high temperature water crystallization and separation; (4) Drying. The obtained long carbon chain dibasic acid product has high monoacid content, good light transmission and high thermal stability, which can meet the needs of different customers and can be used to produce high-grade spices, high-performance engineering plastics, high-temperature dielectrics, high-grade hot melt adhesives, Cold-resistant plasticizers, advanced lubricants, advanced paints and coatings, etc. It has greatly expanded the development space of downstream products of long carbon chain dibasic acid.

Description

technical field [0001] The invention belongs to the technical field of preparing long-carbon-chain dibasic acids by biological fermentation, in particular to a refining process for producing long-carbon-chain dibasic acids by biological fermentation. Background technique [0002] Long chain dicarboxylic acids (Long chain dicarboxy acids) refer to aliphatic dicarboxylic acids (DC for short) containing more than 10 carbon atoms in the carbon chain. n ), including saturated and unsaturated dicarboxylic acids, is a class of fine chemical products with important and extensive industrial uses. , high-grade lubricants, high-grade paints and coatings and other important raw materials. [0003] The production methods of long carbon chain dibasic acids include chemical synthesis and bio-fermentation methods. Foreign countries mainly use chemical synthesis methods. This method mainly uses butadiene as raw material and is produced by chemical synthesis methods. The process is complicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/42C07C55/02C07C57/13C07C57/18C07C57/00C07C55/21
Inventor 雷光李乃强
Owner CATHAY R&D CENT CO LTD
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