A method and system for efficient synthesis of diphenyl carbonate

By using a multi-metal vanadium oxide composite catalyst and an inert carrier gas continuous feed staged condensation technology, the problems of low reaction efficiency and high energy consumption in the synthesis of diphenyl carbonate were solved, and the synthesis of diphenyl carbonate with high conversion rate and low energy consumption was achieved.

CN122010735BActive Publication Date: 2026-07-21LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2026-04-10
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing diphenyl carbonate synthesis processes suffer from problems such as low reaction efficiency, easy catalyst deactivation, difficulty in effectively removing byproducts, and high energy consumption.

Method used

A multi-metal vanadium oxide composite catalyst, combined with continuous inert carrier gas feeding and staged condensation technology, is used to carry out the transesterification reaction in a high-temperature reactor. Carbonate is continuously injected through a gas distributor at the bottom of the reactor, and the by-product alcohol is discharged with the inert carrier gas, thus achieving selective separation of the products.

Benefits of technology

It improves phenol conversion rate and reaction efficiency, reduces energy consumption, simplifies process flow, improves catalyst utilization efficiency, and the by-product alcohol can be used as a valuable by-product.

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Abstract

The present application relates to the technical fields of organic chemical synthesis, and particularly relates to a method and system for efficiently synthesizing diphenyl carbonate. The method uses phenol and carbonate as raw materials, and a multi-metal vanadium oxide composite as a catalyst to react in a high-temperature reaction kettle with mechanical stirring, a condensation reflux device and a kettle bottom gas distributor. The carbonate is continuously injected from the kettle bottom of the high-temperature reaction kettle with an inert carrier gas, the unreacted carbonate is refluxed through staged condensation, and the by-product alcohol is discharged with the inert carrier gas. The carbonate is dimethyl carbonate or diethyl carbonate. The catalyst dosage is 0.5-5wt% of the mass of the phenol raw material. The present application realizes "selective condensation reflux of raw materials (carbonate) and selective removal of by-products (alcohol)" through continuous feeding and specific condensation temperature control, effectively breaks the reversible equilibrium of the ester exchange reaction, greatly promotes the forward reaction, and significantly improves the phenol conversion rate and reaction efficiency.
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