A process for the production of isoamylene by cleavage of methyl tertiary amyl ether

By adding water and separating oil and water during the cracking process of methyl tert-amyl ether, the problem of high energy consumption in the existing technology is solved, and the energy consumption of the methanol recovery tower is significantly reduced, thereby reducing the operating cost of the unit.

CN122167249APending Publication Date: 2026-06-09CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing process for producing isopentenene by cracking methyl tert-amyl ether has high energy consumption, especially the methanol recovery process.

Method used

During the cracking process of methyl tert-amyl ether, it is first mixed with a certain amount of water and then separated into oil and water. A static mixer is used to ensure good dispersion before oil and water separation. This reduces the processing load of the subsequent water washing tower and increases the methanol concentration at the inlet of the methanol recovery tower, thereby reducing the processing capacity and separation difficulty of the methanol recovery tower.

Benefits of technology

By improving the process flow, the energy consumption of the methanol recovery tower was reduced by nearly 30%, thus reducing the operating costs of the unit.

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Abstract

This invention discloses a method for producing isopentenene by cracking methyl tert-amyl ether. The method includes: mixing the methyl tert-amyl ether cracking reaction product with a certain amount of water to obtain a mixture; separating the mixture into oil and water, with the separated aqueous phase entering a methanol recovery tower and the separated crude isopentenene phase entering a water washing tower for washing; the washed crude isopentenene phase entering an isomerization reactor from the top of the water washing tower to convert 2-methyl-1-butene to 2-methyl-2-butene, and then entering an isopentenene refining tower for product refining to produce qualified isopentenene product; the bottom material of the water washing tower entering the methanol recovery tower; the methanol at the top of the methanol recovery tower being reused, and the fresh water obtained at the bottom being reused. This invention removes most of the methanol from the reaction product through oil-water separation, reducing the amount of subsequent water used for washing, thereby reducing the throughput of the methanol recovery tower and achieving the goal of reducing the operating cost of the equipment.
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