Method and device for preparing dimethyl maleate by membrane separation coupled catalytic rectification
By coupling a solid acid catalyst with membrane separation and utilizing a porous diatomaceous earth membrane for online dehydration, the problems of equipment corrosion, high energy consumption, and low conversion rate in existing processes have been solved, achieving efficient and green preparation of dimethyl maleate.
Patent Information
- Application Number
- CN202610629602.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-09
- Publication Date
- 2026-07-17
AI Technical Summary
In the existing dimethyl maleate preparation process, traditional homogeneous acid catalysis leads to equipment corrosion and the generation of saline wastewater. Azeotropic distillation has high energy consumption. Membrane separation process is not resistant to high temperature and has not achieved coupling of reactive distillation and membrane separation. Simple reactive distillation does not completely remove water and has limited improvement in conversion rate.
By coupling a solid acid catalyst with membrane separation and using an inorganic porous membrane for online dehydration, the reactive distillation and membrane separation are integrated. The diatomaceous earth porous membrane selectively permeates water molecules, and methanol vapor is condensed, recovered, and recycled. The reaction temperature and vacuum are controlled, and the catalyst recovery and utilization are optimized.
It significantly improved the maleic anhydride conversion rate to 98.51%, reduced methanol consumption by 20.4%, achieved a product purity of 99.1%, reduced by-products, realized green and continuous production, and reduced equipment corrosion and wastewater generation.
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Abstract
Citation Information
Patent Citations
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