Method for preparing butanedioic acid under catalytic hydrogenation

Abstract

The invention discloses a method for preparing butanedioic acid under catalytic hydrogenation, which is characterized in that one or more of maleic anhydride water solution, fumaric acid water solution or maleic acid water solution are arranged inside a fixed bed reactor with catalyst to be hydrogenated to obtain butanedioic acid. By adopting the fixed bed, the catalytic hydrogenation preparationof butanedioic acid realizes the continuous mass production; transformation rate of raw materials and selectivity of the butanedioic acid reach more than 99 percent, and the purity of the product reaches more than 99.5 percent; the catalyst is of a particle-shaped load-type catalyst, and the separation of the product and the catalyst is not required; by adopting the mother liquid cycling utilization technology, raw material is saved, cost is reduced, yield can reach 100 percent, and zero emission of the three wastes is realized; and the process flow is simple, the economies of scale are large, the yield is high, and the production cost and the energy consumption are low.

Description

technical field [0001] The invention relates to a method for preparing succinic acid by catalytic hydrogenation, in particular to a method for preparing succinic acid by continuous catalytic hydrogenation in a fixed bed. Background technique [0002] Succinic acid, commonly known as succinic acid, is an important fine chemical product and organic synthesis intermediate, widely used in synthetic plastics, rubber, medicine, food, paint and other industries. In recent years, due to the continuous expansion of its application fields, the demand for this product in domestic and foreign markets is also increasing. Especially in the synthetic biodegradable plastic PBS, the demand for succinic acid will increase rapidly, and the market prospect is broad. [0003] There are many ways to produce succinic acid, but the only methods used in industry are microbial fermentation, electrochemical synthesis and catalytic hydrogenation. There are many reports on the microbial fermentation m...

AI Technical Summary

Problems solved by technology

The catalyst has a good hydrogenation effect for the preparation of succinic acid, but the preparation of the catalyst is complicated, and its hydrogenation process is an intermittent and discontinuous process, which requires separation of the product and the catalyst. The catalyst is powder and can be recycled. low rate