Method for producing fumaric acid by maleic anhydride waste water

A technology for fumaric acid and waste water, which is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate, etc., can solve problems such as the rare disclosure of improved technology, achieve simple and controllable process, and solve production problems The problem of the back road and the effect of low cost

Inactive Publication Date: 2013-07-17
XINJIANG JINYUAN GASOLINEEUM CHEM
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[0005] Relevant improved te...

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  • Method for producing fumaric acid by maleic anhydride waste water
  • Method for producing fumaric acid by maleic anhydride waste water

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[0012] The process of the invention comprises a maleic acid isomerization reaction process, a fumaric acid primary product centrifugal separation process, a fumaric acid dissolution and decolorization process, a filtration process, a fumaric acid recrystallization process, a centrifugation process and a fumaric acid drying and packaging process. Specifically, maleic anhydride wastewater is added with a catalyst for isomerization reaction, after centrifugation, activated carbon is added for dissolution and decolorization, filtration and crystallization, recrystallization, and then centrifuged and dried. The fumaric acid in the waste acid water in the maleic anhydride production process can be fully recovered and refined into industrial-grade fumaric acid products.

[0013] Among them, the maleic acid isomerization reaction process includes: pumping the cooled maleic acid aqueous solution to the isomerization reaction kettle, the isomerization kettle is a 12 cubic reaction kettle...

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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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Application Information

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IPC IPC(8): C07C57/15C07C51/353C07C51/42
Inventor 彭巧玲蔡瑞峰刘鹏樊景峰杨栩陈维勇石池疆
Owner XINJIANG JINYUAN GASOLINEEUM CHEM
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