Cibt America Inc.

Cathay Biotech Inc.

Cathay (jinxiang) Biomaterial Co., Ltd.

Shuhua Zhang

Xiucai Liu

Chen Yang

Yufeng Yang

The present disclosure provides a method for extracting long chain dicarboxylic acid, the method comprising: (1) subjecting a long chain dicarboxylic acid fermentation broth to a primary membrane filtration treatment to give a first filtrate; subjecting the first filtrate to decolorization, crystallization, and solid-liquid separation to give a first solid; (2) redissolving the first solid in water to form a solution; subjecting the solution to decolorization, crystallization by acidification, and solid-liquid separation to give a second solid. By the method, the resulted long chain dicarboxylic acid product has a high purity and no residual organic solvent.

Method and system for extracting long chain dicarboxylic acid

The present disclosure provides a system for extracting long chain dicarboxylic acid, the system comprising:

The present disclosure provides a method and a system for extracting long chain dicarboxylic acid, the method comprising: (1) subjecting a long chain dicarboxylic acid fermentation broth to a primary membrane filtration treatment to give a first filtrate; subjecting the first filtrate to decolorization, acidification/crystallization, and solid-liquid separation treatments to give a first solid; (2) mixing the first solid, a base and water to form a solution; subjecting the solution to a secondary membrane filtration treatment to give a second filtrate; subjecting the second filtrate to decolorization, acidification/crystallization, and solid-liquid separation treatments to give a second solid; and (3) mixing the second solid and water to form a mixture; subjecting the mixture to a thermostatic treatment at 105-150&#xb0; C., followed by cooling for crystallization and solid-liquid separation treatment. By the method, the resulted long chain dicarboxylic acid product has a high purity and no residual organic solvent.

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Shanghai, China

Shuhua Zhang