Method for interesterification synthesis of diphenyl carbonate by dimethyl carbonate

Abstract

The invention relates to a method for interesterification synthesis of diphenyl carbonate by dimethyl carbonate. In the method, phenol and the dimethyl carbonate are used as raw materials, and carbon nano tube-loaded titanium dioxide is used as a catalyst; the carbon nano tube-loaded titanium dioxide used as the catalyst can be prepared by a sol gel method, a immersion method or a hydrothermal method; and the catalyst takes carbon nano tube (CNT) as a carrier and titanium dioxide as an active component. The catalyst has the high activity, good selectivity and high stability on reaction for preparing the diphenyl carbonate by using the dimethyl carbonate and the phenol, so that the total yield of the dimethyl carbonate and alkyphenyl carbonic ester reaches 49.0%, no byproducts are generated, the catalyst can be repeatedly used for four times, and the conversion rate of the phenol still keeps above 45%. The carbon nano tube-loaded titanium dioxide catalyst is a multi-phase catalyst, is easy to separate, can be recycled and has potential industry application value.

Description

technical field [0001] The invention discloses a method for synthesizing diphenyl carbonate by heterogeneous transesterification. In the method, dimethyl carbonate and phenol are used as raw materials, and titanium dioxide supported by carbon nanotubes is used as a heterogeneous catalyst, and diphenyl carbonate is synthesized by transesterification. Background technique [0002] Diphenyl carbonate is non-toxic and non-polluting. It is an important green and environmentally friendly chemical product. It can be used to synthesize many important organic compounds and polymer materials, especially it can replace highly toxic phosgene and bisphenol A. The production performance is excellent. polycarbonate. The synthesis methods of diphenyl carbonate mainly include phosgene method, transesterification method and oxidative carbonylation method. The traditional phosgene method, due to the high toxicity and strong corrosiveness of phosgene, has great safety and environmental proble...

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Problems solved by technology

[0004] In the homogeneous catalytic system, the yield of diphenyl carbonate is high, but there are problems such as catalyst separation and recovery, and environmental pollution. Therefore, extensive research has been carried out on heterogeneous catalysts.

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