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Catalyst composition and method for producing diaryl carbonates

A technique for diaryl carbonate and compounds, applied in the field of preparation of diaryl carbonate, capable of solving problems such as low yield and segregation of diaryl carbonate

Inactive Publication Date: 2005-09-14
SABIC INNOVATIVE PLASTICS IP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a substituting compound is sodium bromide, however, it causes the desired diaryl carbonate to be isolated in very low yields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0033]Carbonylation experiments using palladium(II) 2,4-pentanedionate, sodium bromide and sulfolane were carried out in small vials in an amount of 24 ppm palladium as phenol and 270 per equivalent of palladium. equivalent of sodium bromide and 1 part by volume of sulfolane per 1.86 parts of phenol. Various catalysts including lead(II) oxide, titanium(IV) oxide bis(2,4-pentanedionate), zinc 2,4-pentanedionate, and copper(II) 2,4-pentanedionate The compounds can be used alone or in admixture, and they are used as component D. Cap each vial with a spring cap with a Teflon septum, place the vial in an autoclave containing a mixture of 91.7 mole % carbon monoxide and 8.3 mole % oxygen, and pressurize the autoclave to 81.6 atm and heated to 100°C for 3 hours. The contents of the vials were analyzed by gas chromatography for the amount of diaryl carbonate.

[0034] Example

[0035] It is clear that the examples using sulfolane are improved over the comparative examples...

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PUM

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Abstract

Hydroxyaromatic compounds such as phenol are carbonylated with oxygen and carbon monoxide in the presence of a catalyst system comprising a Group VIIIB metal, preferably palladium; an alkali metal or alkaline earth metal halide, preferably sodium bromide; and at least one sulfone such as sulfolane. The catalyst system also preferably contains a compound of another metal, preferably lead.

Description

Background of the invention [0001] This invention relates to the preparation of diaryl carbonates by carbonylation. More particularly, this invention relates to increasing the yield of diaryl carbonates in carbonylation reactions. [0002] Diaryl carbonates are valuable intermediates for the preparation of polycarbonates by transesterification with bisphenols in molten form. This method of preparing polycarbonate has environmental advantages over methods using phosgene, a poisonous gas as a reactant, and environmentally harmful chlorinated aliphatic hydrocarbons as a solvent, such as dichloromethane. [0003] Various processes for the preparation of diaryl carbonates by oxidative carbonylation of hydroxyaromatic compounds with carbon monoxide and oxygen (hereinafter sometimes simply referred to as "carbonylation reactions") have been disclosed. In general, carbonylation reactions require relatively complex catalysts. In this regard, reference is made, for example, to U.S. P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J31/22B01J31/28C07B61/00C07C68/00C07C69/96
CPCB01J2531/44B01J31/0222B01J2531/26B01J2531/824B01J31/2239B01J2531/16C07C68/005B01J31/2234B01J2531/46C07C68/01C07C69/96C07C68/00
Inventor B·F·约翰森K·V·沙耶夫G·L·索洛维奇克E·J·普雷斯曼
Owner SABIC INNOVATIVE PLASTICS IP BV