Oxidative carbonylation of monohydroxy aryl compounds by methyl formate
申请人:Bayer MaterialScience AG
公开号:EP2781503A1
公开(公告)日:2014-09-24
The field of the present invention relates to a process for continuously preparing alkylaryl carbonates and diarylcarbonates from methyl formate and at least one monohydroxy aryl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates.
PROCESS FOR PREPARING DIARYL CARBONATES FROM DIALKYL CARBONATES
申请人:Düx Andre
公开号:US20100010252A1
公开(公告)日:2010-01-14
The invention provides a process for preparing diaryl carbonates from dialkyl carbonates and aromatic hydroxyl compounds using at least two reaction columns, a process section for recovering the dialkyl carbonate used in the reaction and for removing the alcohol of reaction, one or more process steps for removing the by-products obtained in the process which have a boiling point between that of the dialkyl carbonate and that of the alkyl aryl carbonate formed during the preparation of the diaryl carbonate, and a process step for further purification of the diaryl carbonate obtained from the reaction columns.
PROCESS FOR THE CONTINUOUS MANUFACTURE OF ARYL ALKYL CARBONATE AND/OR DIARYL CARBONATE USING VAPOR RECOMPRESSION
申请人:SABIC Innovative Plastics IP B.V.
公开号:US20140081039A1
公开(公告)日:2014-03-20
In an embodiment, a process for preparing an alkyl aryl carbonate and a diaryl carbonate, comprising: reacting a dialkyl carbonate and an aromatic hydroxy compound in a production column
200, 300
to form the alkyl aryl carbonate and the diaryl carbonate; directing a bottom stream of the production column to a reboiler
205, 305
, wherein the bottom stream comprises the alkyl aryl carbonate and the diaryl carbonate; heating the bottom stream in the reboiler
205, 305
with heat from an overhead stream of the production column
200, 300
to result in a heated bottom stream; directing a first portion of the heated bottom stream back into the production column
200, 300
, wherein the first portion comprises phenol; and collecting the diaryl carbonate and the alkyl aryl carbonate from a second portion of the heated bottom stream.
Processes comprising: transesterifying a dialkyl carbonate and an aromatic hydroxyl compound in the presence of a transesterification catalyst to provide a diaryl carbonate product comprising the transesterification catalyst as an impurity; subjecting the diaryl carbonate product to distillation in a first distillation column having an upper part and a lower part, wherein the upper part comprises a rectifying section and the lower part comprises a stripping section; and withdrawing a first sidestream from the first distillation column, wherein the first sidestream comprises a purified diaryl carbonate.
Process For The Preparation Of Diaryl Carbonates Or Arylalkyl Carbonates From Dialkyl Carbonates
申请人:Dux Andre
公开号:US20080293960A1
公开(公告)日:2008-11-27
The invention provides a process for the preparation of diaryl carbonates and/or alkylaryl carbonates from dialkyl carbonates and aromatic hydroxy compounds using one or more intermediate condensers for improving heat integration.