PREPARING AND PURIFYING PROCESS FOR SUCCINIC ACID

摘要

A process for producing and purifying succinic acid comprises growing a succinate salt-producing microorganism on an inexpensive substrate containing carbohydrate, other nutrients, sodium ions and tryptophan under a CO2 partial pressure until most of the carbohydrate is converted to succinate. The fermentation broth is then electrodialyzed to recover and concentrate the succinate salt in an aqueous stream which is subjected to water-splitting electrodialysis to form base and a succinic acid product. The resulting succinic acid product is treated first with a strongly acidic ion exchanger in the acid form to remove any sodium or other cations and then treated with a weakly basic ion exchanger in the free base form to remove any sulfate ions or sulfuric acid and to obtain a highly purified succinic acid product.