Method for producing fumaric acid by maleic anhydride waste water

Abstract

The invention relates to a method for producing fumaric acid by maleic anhydride waste water. The method comprises an isomerization reaction process of the maleic anhydride waste water, a centrifugal separation process of fumaric acid head products, a dissolution and decoloration process of the fumaric acid, a filtration process, a crystallization and re-crystallization process of the fumaric acid, a centrifugation process and a drying and packaging process of the fumaric acid. Specifically, the method comprises the steps of adding a catalyst to the maleic anhydride waste water to carry out the isomerization reaction, adding activated carbon to carry out dissolution and decoloration, filtration and crystallization and re-crystallization after the centrifugal separation, then centrifuging, drying and packaging to obtain the fumaric acid. With the method, the fumaric acid in waste acid water generated in production process by using the maleic anhydride can be fully recovered and industrial grade fumaric acid products can be made, so that discharging amount of waste can be reduced maximally, valuable fumaric acid resource can be recovered, and reutilization of the resource is realized. The preparation method is simple and controllable in process, relatively low in cost and has significant social and economic benefits.

Description

technical field [0001] The invention relates to the international patent classification CO7C acyclic or carbocyclic compound technology, especially a method for producing fumaric acid from maleic anhydride wastewater. Background technique [0002] Domestic industrial production of maleic anhydride began in the 1950s, but due to limited reactor design and manufacturing levels, poor catalyst performance, high consumption, serious pollution, and small-scale production equipment, the development was very slow. Since the application of 10,000-ton maleic anhydride production equipment in the 1980s, various economic indicators such as product quality and raw material consumption have been improved. At present, the technology of producing maleic anhydride by benzene fixed bed oxidation method is relatively mature, and the process is roughly the same as the AlusllisldUCB method, but the post-treatment adopts xylene azeotropic dehydration process, and usually in the maleic anhydride f...

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[0005] Relevant improved technologies are rarely made public

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