METHOD FOR PRODUCING A LONG CHAIN DICARBOXYLIC ACID BY FERMENTATION, FERMENTATION BROTH, TREATED FERMENTATION BROTH AND WASTEWATER

摘要

The present invention discloses a method for producing a long chain dicarboxylic acid by fermentation as well as a fermentation broth, a treated fermentation broth and a wastewater. The salt content in the fermentation broth is controlled to be below 20% by the fermentation method of the present invention. The method for producing a long chain dicarboxylic acid by fermentation provided by the present invention can effectively reduce the amount of alkali used in the fermentation process and the amount of acid used in the subsequent extraction of the long chain dicarboxylic acid, thereby reducing the amount of salt in the whole production process of the long chain dicarboxylic acid. At the same time, the method of the present invention also has many advantages such as shortening the fermentation time, increasing the acid production, reducing the amount of medium, and suitable for the production of various types of long-chain dicarboxylic acids, etc. Compared with the existing production process, the method of the present invention not only has significant cost advantages, but also can effectively reduce the pressure on resource and environment, thus it has a very obvious value advantage in industrialization.