Method for one-step preparation of propiolactone from liquid lactic acid
By using a combination of high-boiling-point solvents and inert gases, the problems of low hydrolysis efficiency, polymerization reaction, and catalyst deactivation in the one-step preparation of lactide from lactic acid were solved, thus realizing efficient lactide production and continuous operation of the catalyst.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2025-01-16
- Publication Date
- 2026-07-17
AI Technical Summary
The existing one-step process for preparing lactide from lactic acid has low hydrolysis efficiency, generates a large amount of polymers, and the catalyst is easily deactivated, making it difficult to achieve continuous production, and the reaction temperature is difficult to control.
High-boiling-point solvents such as benzophenone and dihydrolactic acid are mixed with lactic acid, and an inert gas is used to remove moisture. Molecular sieve catalysts are used to achieve a highly dispersed reaction of lactic acid, avoid polylactic acid adhesion, improve reaction efficiency and extend catalyst life. A catalytic separation reactor is used to achieve continuous production.
It improves the yield and selectivity of lactide, extends the catalyst life, and enables flexible control of reaction temperature and continuous production.
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Abstract
Citation Information
Patent Citations
Method for generating lactide by one-step conversion
CN112574165A