A method and system for producing cyclic esters

By combining pyrolysis cyclization with gas-liquid contact absorption crystallization, the problems of low yield and high material and energy consumption of cyclic esters in existing technologies have been solved, and high-purity and high-yield cyclic ester production has been achieved.

CN122164302APending 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
2024-12-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In the prior art, the gaseous crude cyclic esters generated by the depolymerization reaction contain depolymerization byproducts and unreacted prepolymers. Directly sending them to the purification unit will increase material and energy consumption, and the yield of cyclic esters is low.

Method used

By pyrolyzing the oligomers of cyclic ester precursors to form gaseous cyclic esters, which then come into contact with liquid polymers, the liquid phase is condensed and recycled back to the pyrolysis and cyclization reaction. Combined with absorption and crystallization treatments, the recovery rate and purity of cyclic esters are improved.

Benefits of technology

This method achieves high purity and high yield of cyclic esters, while reducing material and energy consumption during the production process.

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Abstract

This invention discloses a method and system for producing cyclic esters. The method includes: (1) pyrolyzing and cyclizing a cyclic ester precursor oligomer to obtain a gaseous cyclic ester; (2) contacting the gaseous cyclic ester with a liquid polymer to form a post-contact gas phase and a post-contact liquid phase, condensing the post-contact gas phase, and recycling the post-contact liquid phase back to step (1). The system includes a pyrolyzing and cyclizing reactor, a gas-liquid contact device, and a condenser. The method and system of this invention can be used to produce cyclic esters with high purity and high yield.
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