Method for preparing cyclic carbonate by co-utilizing waste polyvinyl chloride plastic and carbon dioxide

By reacting waste polyvinyl chloride (PVC) plastic with carbonates and vicinal diols with carbon dioxide under normal pressure, the low yield problem of high-temperature and high-pressure preparation of cyclic carbonates was solved, realizing efficient and low-cost preparation of cyclic carbonates and providing a way to reuse waste PVC plastics.

CN122444683APending Publication Date: 2026-07-24NANKAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANKAI UNIV
Filing Date
2026-06-22
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the existing technology, the method for preparing cyclic carbonates by reacting vicinal diols with carbon dioxide requires harsh conditions of high temperature and high pressure, and the yield is low. Although the use of dehydrating agents or reaction aids can improve the yield, it also increases the cost.

Method used

Waste polyvinyl chloride (PVC) plastic was used as an accelerator to react with carbonates and vicinal diols under normal pressure to prepare cyclic carbonates. The accelerating effect of waste PVC plastic was utilized to improve the reaction efficiency under mild conditions.

Benefits of technology

This method enables the efficient preparation of cyclic carbonates under normal pressure, with a yield of up to 94%. It reduces reaction costs and provides a way to reuse waste polyvinyl chloride plastics, thereby reducing carbon emissions and dependence on petroleum resources.

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Abstract

The present application relates to a kind of waste polyvinyl chloride plastics and carbon dioxide co-utilization preparation cyclic carbonate method, in the reaction of preparation cyclic carbonate with o-diol and carbon dioxide as raw material, add carbonate as additive, under the promotion of cheap and easy to obtain waste polyvinyl chloride plastics, can be realized under mild conditions High-efficiency synthesis of cyclic carbonate.The reaction uses widely available, sustainable access and low-cost waste polyvinyl chloride plastics as reaction aid, improves the synthesis reaction efficiency of cyclic carbonate, improves product yield, and waste polyvinyl chloride plastics is easy to separate after reaction, and the risk coefficient of mild reaction condition is reduced Reaction cost, can be suitable for large-scale industrial production.
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