Method and system for preparing isobutene from tert-butyl alcohol

Through the multi-stage reaction-multi-stage membrane separation-multi-stage flash separation-first-stage distillation separation, the problems of low reaction efficiency and large wastewater discharge in the preparation of isobutene by hydrolysis of tert-butanol are solved, and the preparation of high purity isobutylene and high conversion rate of tert-butanol are achieved.

CN120574103APending Publication Date: 2025-09-02CHINA NAT PETROLEUM CORP +2
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Patent Information

Application Number
CN202510499988.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-21
Publication Date
2025-09-02

AI Technical Summary

Technical Problem

In the prior art, the reaction efficiency of tert-butanol hydrolysis of isobutylene is low, the conversion rate is not high, and the wastewater discharge is large, resulting in tert-butanol loss and environmental pollution.

Method used

The method of multi-stage reaction-multi-stage membrane separation-multi-stage flash separation-first-stage distillation separation is adopted. The generated water and isobutene are removed in time through membrane permeation separation, and the liquid phase tert-butanol is recycled to distillate and separate high-purity isobutene and reduce wastewater discharge.

Benefits of technology

The reaction efficiency and conversion rate of isobutene are improved in the preparation of isobutene by tert-butanol, the wastewater discharge is reduced, and the utilization rate of tert-butanol is enhanced.

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Abstract

The invention relates to a method and system for preparing isobutene from tert-butyl alcohol, and the method comprises the following steps: S1, hydrolyzing initial tert-butyl alcohol to obtain a first product containing water, isobutene and unreacted tert-butyl alcohol; s2, performing membrane permeation separation on the first product to obtain a water permeate and a retentate containing isobutene and unreacted tert-butyl alcohol; s3, performing flash evaporation separation on the retentate to obtain gas-phase isobutene and liquid-phase tert-butyl alcohol; circulating the liquid-phase tert-butyl alcohol and repeating the steps S1 to S3 until the total conversion rate of the initial tert-butyl alcohol reaches a preset value; rectifying the liquid-phase tert-butyl alcohol, all water permeates and all gas-phase isobutene obtained in the last-stage circulation to obtain high-purity isobutene, water-tert-butyl alcohol azeotrope and wastewater; the water-tert-butyl alcohol azeotrope is extracted from the side line of the rectifying stripping section and returns to S2 for recycling. Through cyclic coupling of hydrolysis, membrane permeation separation, flash separation and rectification, high-purity isobutene is obtained, the conversion rate of tert-butyl alcohol is high, and the discharge amount of wastewater is low.
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