January 21, 2013

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The following patent record is from the CAplusSM database.

CAPLUS COPYRIGHT 2013 ACS

Patent Number: US 8304509
Title: Procedure for the production of diarylcarbonates from dialkyl carbonates
Inventor(s): Guertler, Christoph; Mueller, Thomas Ernst; Ooms, Pieter; Risse, Friedhelm; Rechner, Johann; Doro, Franco; Prokofieva, Angelina
Patent Assignee(s): Bayer Materialscience Aktiengesellschaft, Germany
Source: Ger. Offen., 31pp. CODEN: GWXXBX
Language: German

Abstract:
A continuous production of diarylcarbonates from dialkyl carbonates and hydroxyarom. compds. comprises (a) manufacturing alkylene carbonates by reacting alkylene oxides with CO2, (b) reacting these alkylene carbonates with aliphatic alcs. to obtain dialkyl carbonates and alkylene glycol, (c) separating dialkyl carbonates, (d) separating alkylene glycols, (e) oxidative carbonylation separated alkylene glycols with CO to obtain alkylene carbonate, (f) reacting dialkyl carbonates with monophenol to obtain alkylarylcarbonate or diarylcarbonate and aliphatic alc., (g) disproportionation alkylarylcarbonates to diarylcarbonates and dialkylcarbonates and (h) optionally reacting diarylcarbonates with bisphenols to obtain polycarbonates.

Please note:  Abstracts and Titles for patent records in CAplus are routinely enhanced to better describe the claimed invention. The title of the U.S. granted patent is Process for preparing diaryl carbonates from dialkyl carbonates.

 View the full-text here.

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