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Method for synthesizing diphenyl carbonate from dimethyl carbonate

A technology of dimethyl carbonate and diphenyl carbonate, which is applied in the field of synthesizing diphenyl carbonate, can solve the problems of difficult reaction, harsh process conditions, complex and cumbersome process, etc., and achieve the effects of easy control, high reaction efficiency and simple process

Active Publication Date: 2012-09-19
SHANGHAI HUAYI ENERGY CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a kind of method that phenol and dimethyl carbonate synthesize diphenyl carbonate, the present invention adopts adding organometallic compound (RO) in reaction raw materialxM or anhydrous metal chloride, the intermediate phenoxy metal compound (C6H6O)xM, said (C6H6O)x M is reacted with dimethyl carbonate again to prepare diphenyl carbonate, the reaction efficiency is high, and the reaction conditions are mild, so as to overcome the above-mentioned existing diphenyl carbonate preparation process, difficult reaction, harsh process conditions, complicated and loaded down with trivial details etc.

Method used

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  • Method for synthesizing diphenyl carbonate from dimethyl carbonate
  • Method for synthesizing diphenyl carbonate from dimethyl carbonate
  • Method for synthesizing diphenyl carbonate from dimethyl carbonate

Examples

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Effect test

Embodiment 1

[0034] Step 1: After dehydration, the phenol and butyl titanate are mixed evenly in a molar ratio of 4:1, and phenyl titanate is synthesized by reaction distillation under normal pressure. The reaction temperature is 150°C, and the reaction time is 2 hours. Alcohol, isolated from phenyl titanate.

[0035] Step 2: Phenyl titanate and dimethyl carbonate are mixed in a molar ratio of 1:4, and the reaction is carried out in a closed reactor with a pressure of 5 atm, a reaction temperature of 150°C, and a reaction time of 4 hours to obtain methyl Phenyl carbonate.

[0036] Step 3: The obtained product methyl phenyl carbonate carries out disproportionation reaction, adopts atmospheric pressure reaction distillation process, and reaction temperature is 180 ℃, and catalyst is phenyl titanate, and its content is 4wt%, and reaction time is 4 hours, obtains dicarbonate phenyl esters.

[0037] Step 4: Separating the reaction mixture in step 2 under reduced pressure to finally obtain met...

Embodiment 2

[0039] Step 1: After dehydration, phenol and isopropyl titanate are mixed evenly in a molar ratio of 4:1, and phenyl titanate is synthesized by reaction distillation under normal pressure. The reaction temperature is 140°C, and the reaction time is 3 hours. Butanol, isolated from phenyl titanate.

[0040] Step 2: Phenyl titanate and dimethyl carbonate are mixed at a molar ratio of 1:4 and reacted in a closed reactor with a pressure of 8atm, a reaction temperature of 160°C, and a reaction time of 4 hours to obtain formazan phenyl carbonate.

[0041] Step 3: The obtained product methyl phenyl carbonate is subjected to disproportionation reaction, adopts atmospheric pressure reactive distillation process, the reaction temperature is 180 ° C, the catalyst is phenyl titanate, its content is 4wt%, and the reaction time is 4 hours to prepare carbonic acid diphenyl esters.

[0042] Step 4: Separating the reaction mixture in step 2 under reduced pressure to finally obtain methyl tita...

Embodiment 3

[0044] Step 1: After dehydration, phenol and isopropyl titanate are mixed evenly in a molar ratio of 4:1, and phenyl titanate is synthesized by reaction distillation under normal pressure. The reaction temperature is 130°C, and the reaction time is 3 hours. Butanol, isolated from phenyl titanate.

[0045] Step 2: Phenyl titanate and dimethyl carbonate are mixed at a molar ratio of 1:4 to react. The reaction is carried out in a closed reactor with a pressure of 10atm, a reaction temperature of 150°C, and a reaction time of 4 hours to obtain formazan phenyl carbonate.

[0046] Step 3: The obtained product methyl phenyl carbonate is subjected to disproportionation reaction, adopts atmospheric pressure reactive distillation process, the reaction temperature is 180 ° C, the catalyst is phenyl titanate, its content is 4wt%, and the reaction time is 4 hours to prepare carbonic acid diphenyl esters.

[0047] Step 4: Separating the reaction mixture in step 2 under reduced pressure to...

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Abstract

The invention relates to a method for synthesizing diphenyl carbonate from phenol and dimethyl carbonate. The method comprises the following process steps of: synthesizing a phenoxy metal compound by using the phenol as a raw material with an organic metal compound (RO)XM or absolute metal chloride; reacting with the dimethyl carbonate to synthesize methyl phenyl carbonate and a methoxy metal compound; and finally performing disproportionation on the methyl phenyl carbonate to synthesize the diphenyl carbonate. In the synthesis process, the methoxy metal compound produced by the reaction can be continuously subjected to synthesis with the phenol to obtain the phenoxy metal compound and recycled. The method for synthesizing the diphenyl carbonate has the advantages of simple process, mild reaction conditions and capability of meeting requirements of industrial large-scale production.

Description

technical field [0001] The invention relates to a method for synthesizing diphenyl carbonate, in particular to a method for synthesizing diphenyl carbonate by using phenol and dimethyl carbonate as raw materials. Background technique [0002] Diphenyl carbonate (DPC for short) is non-toxic and non-polluting. It is an important environmentally friendly organic carbonate. , methyl p-hydroxybenzoate, monoisocyanate, diisocyanate, and plasticizers for the preparation of polyamides and polyesters; used as solvents and heat carriers in chemical production. [0003] DPC is an important raw material for the synthesis of bisphenol A polycarbonate, and bisphenol A polycarbonate (referred to as PC), because of its excellent comprehensive performance and processing performance, is widely used in electrical and electronic parts, machinery and textile industry parts Components, architectural structural parts, aviation transparent materials and parts, foam structural materials, etc.; and ...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/06
Inventor 孙卫中徐长青庄庆龙李俊岭
Owner SHANGHAI HUAYI ENERGY CHEM
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