一种从乳酸低聚物中制备丙交酯的方法
By combining depolymerization reaction, solid-liquid mixing and separation, suspension crystallization and layer crystallization, the method for preparing lactide from lactic acid oligomers has solved the problems of low lactide yield, large purity fluctuation and low acid impurity removal rate, and has achieved efficient and low energy consumption lactide production.
Patent Information
- Application Number
- CN202310226685.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-03-10
- Publication Date
- 2026-07-17
- Estimated Expiration
- 2043-03-10
AI Technical Summary
The existing technology suffers from low lactide yield, large purity fluctuations, and low removal rates of acidity and other impurities, which are difficult to solve simultaneously, especially in distillation and crystallization separation methods.
A method for preparing lactide from lactic acid oligomers includes steps such as depolymerization reaction, solid-liquid mixing and separation, suspension crystallization, layer crystallization and distillation. Through a combination of reactive distillation, suspension crystallization, layer crystallization and distillation, lactide can be efficiently separated and purified.
This method improved the yield of lactide, stabilized its purity, reduced acidity and impurity content, decreased energy consumption and equipment investment, and achieved high-purity, high-yield lactide production.
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Figure CN116425713B_ABST
Abstract
Citation Information
Patent Citations
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US5264592A
Continuous process for the manufacture of lactide and lactide polymers
WO1995009879A1
Continuous production method and device from lactic acid oligomer to high-optical-purity polymer-grade lactide
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