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Organic titanium catalyst for exchange reaction of dimethyl carbonate and phenol ester

A technology of dimethyl carbonate and diphenyl carbonate, applied in the field of organic titanium catalysts, can solve problems such as the inability to reuse heterogeneous catalysts, and achieve the effects of easy separation and simple preparation method

Active Publication Date: 2015-08-26
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, none of the above heterogeneous catalysts can be reused

Method used

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  • Organic titanium catalyst for exchange reaction of dimethyl carbonate and phenol ester
  • Organic titanium catalyst for exchange reaction of dimethyl carbonate and phenol ester

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Using butyl titanate (0.05mol) and acetic anhydride as raw materials, 50ml of cyclohexane as solvent, the molar ratio of titanium to water is 1, and the molar ratio of titanium to acetic acid is 0.2, the reactor is reacted at 90°C, and after calcination at 200°C Catalyst sample 1 was obtained.

Embodiment 2

[0023] Using butyl titanate (0.05mol) and trifluoroacetic acid as raw materials, cyclohexane as the solvent, the molar ratio of titanium to water is 1, and the molar ratio of titanium to trifluoroacetic acid is 0.2. Catalyst sample 2 was obtained after calcination.

Embodiment 3

[0025] Using titanyl sulfate (0.05mol) and acetic anhydride as raw materials, cyclohexane as the solvent, the molar ratio of titanium to water is 1, and the molar ratio of titanium to acetic anhydride is 0.2, the reactor is reacted at 90°C and roasted at 200°C to obtain Catalyst Sample 3.

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Abstract

The invention relates to an organic titanium catalyst for an exchange reaction of dimethyl carbonate and phenol ester. The catalyst is composed of titanium oxyacelate formed through coordination of titanium and an acetate radical, and a solvothermal method is adopted to solve the catalyst and mainly solves the problems of difficult catalyst separation and recovery and low ester exchange activity. The organic titanium catalyst prepared through the method has a high catalysis effect on a reaction for synthesizing diphenyl carbonate through an ester exchange process, and allows the phenol conversion rate to reach 47.8% and the ester exchange selectivity to reach above 99.9%. The catalyst has the advantages of cheap and easily available raw materials, simple preparation method, insolubility in a reaction system, easy separation and recovery from the reaction system after the reaction, and repeated use.

Description

technical field [0001] The invention discloses an organotitanium catalyst for synthesizing diphenyl carbonate through transesterification of dimethyl carbonate and phenol. Background technique [0002] Diphenyl carbonate is an important chemical intermediate, which can synthesize many organic intermediates and polymer materials through reactions such as halogenation, nitration, hydrolysis and ammonolysis, especially to replace the highly toxic phosgene and bisphenol A. Polycarbonate with excellent synthetic properties. At present, the synthesis methods of diphenyl carbonate mainly include phosgene method, phenol oxidative carbonylation method and transesterification method. Due to the extreme toxicity of phosgene, the traditional phosgene method produces a large amount of hydrochloric acid by-product, which will corrode the equipment, and has great potential safety hazards and environmental problems, and is being gradually eliminated by the new method. Although the oxidati...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C53/10C07C53/18C07F7/28B01J31/22C07C69/96C07C68/06
CPCY02P20/584
Inventor 陈彤唐荣芝王公应姚洁马飞张华曾毅
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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