Preparation system and preparation method for polylactic acid production

By combining a circulation loop system of batch and tubular reactors, the problems of equipment failure and uneven mixing in the existing polylactic acid synthesis have been solved, realizing efficient and low-cost polylactic acid preparation and improving product quality and yield.

CN116272792BActive Publication Date: 2026-07-10WANHUA CHEM GRP CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-01
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing polylactic acid synthesis processes suffer from problems such as raw material waste due to equipment failure, uneven molecular weight distribution due to uneven mixing, and high monomer residues. Furthermore, the inherent defects of both batch and tubular processes have not been effectively resolved.

Method used

By combining a batch reactor and a tubular reactor to form a circulation loop, the initial polymerization is carried out in the batch reactor, followed by multiple cycles of mixing and reaction in the tubular reactor. Combined with vacuum devolatilization, a preparation system and method are formed to ensure controllable molecular weight and uniform mixing.

Benefits of technology

It significantly reduces raw material waste, improves the yield and quality of polylactic acid, achieves a more uniform molecular weight distribution, reduces equipment investment costs, and enhances preparation efficiency.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116272792B_ABST
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Abstract

A preparation system for preparing polylactic acid, comprising a circulating system formed by a series connection of a tank reactor, a melt pump and a tubular reaction unit; the tank reactor comprises a feeding port, a vacuum device connecting port, a mechanical stirrer, a material inlet, a material distributor and a material outlet; the inlet and outlet of the melt pump are connected to the material outlet of the tank reactor and the material inlet of the tubular reaction unit respectively; the tubular reaction unit (3) comprises n tubular reaction sub-units arranged in series, nβ‰₯1; the tubular reaction sub-unit comprises a material mixer and a tubular reactor connected in series; at least one material mixer is provided with a deactivator adding pipeline. A preparation method is also provided. The preparation system combines the tank reactor and the tubular reactor and forms a circulating loop, so that the equipment is less and the operation is stable; the preparation method uses the tank reactor in the early stage and uses the tubular reactor in the later stage, so that the mixing effect can be effectively improved, the raw material waste can be avoided, and the quality of the polylactic acid product can be improved.
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Citation Information

Patent Citations

  • Multistage reaction continuous polymerization unit for synthesizing polylactic acid material with lactides monomer

    CN101353417A

  • Polylactic acid-based polyol composition, process for production thereof, urethane resin composition, process for production of same, and molded products thereof

    CN102686670A