Process of separating and extracting succinic acid from anaerobic fermented liquid

Abstract

The present invention discloses process of separating and extracting succinic acid from anaerobic fermented liquid. The process includes filtering the fermented liquid of succinic acid with microfiltering membrane, filtering with ultrafiltering membrane, decolorizing and depurating with active carbon to obtain clarified succinic acid solution, concentrating, and crystallizing to obtain succinic acid product. The process has the features of mild condition, simple operation, short separating path, low cost, high selectivity and high product quality.

Description

technical field [0001] The invention relates to a method for separating and extracting succinic acid, in particular to a method for separating and extracting succinic acid from a fermented liquid prepared by anaerobic fermentation using membrane separation, activated carbon decolorization and crystallization techniques. Background technique [0002] Succinic acid (Succinic Acid, Butanedioic Acid), also known as succinic acid, is a dibasic organic acid, which is an important C 4 Platform compounds, which can be used as intermediates in the synthesis of complex organic compounds, are widely used in pharmaceuticals, food processing, synthetic plastics, rubber, protective coatings, dyes and other industries. [0003] There are two main methods for the preparation of succinic acid, one is produced by petrochemical method, and the other is produced by microbial fermentation method. Due to the cost and environmental pollution of the traditional petrochemical succinic acid, the pro...

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Problems solved by technology

[0010] Due to the need to add a large amount of calcium and magnesium salts during the fermentation process to control the normal progress of the fermentation, the high content of ionic substances accelerates the saturation of the resin, increases the number of regenerations of the resin, and causes problems such as a large amount of sewage discharge.

[0011] The calcium salt method is not suitable for ion exchange treatment due to the high salt content in the fermentation liquid, serious resin pollution, and difficult regeneration. In addition, a large amount of solid and slurry needs to be processed, and a large amount of gypsum waste residue pollution is generated, and the acid-base consumption is large.

Using electrodialysis, the route is long, the energy consumption is high, and the treatment of impurity ions has great limitations, the investment in equipment is large, and the operation is difficult

The solvent extraction method consumes a large amount of expensive organic solvents during the extraction process. The toxicity of residual solvents has a negative impact on the quality of food-grade and pharmaceutical-grade products. At the same time, this method is not suitable for fermentation broth systems with high ionic strength.

The operating conditions of the long crystallization process of the ammonium salt method are relatively harsh, and high temperature pyrolysis of sulfate is also required, which is cumbersome and difficult

In short, the above patents all have the disadvantages of long process route (6-8 step separation operation unit), high operating cost, difficult implementation, serious environmental pollution, etc., which increase the operating cost and are not conducive to the large-scale production of succinic acid prepared by fermentation. , which weakens the product's market competitiveness