Process for producing dialkyl carbonates

US9475751B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Pieter Ooms · Krefeld, DE
• Friedhelm Risse · Hanerau-Hademarschen, DE
• Andre Düx · Bogen, DE
• Carsten Buchaly · Mülheim an der Ruhr, DE
• Thomas Pancur · Altenholz, DE
• Arthur Susanto
• Georg Ronge · Mülheim an der Ruhr, DE
• Johan Vanden Eynde · Zwijnaarde, BE
• Wim Wuytack · Zele, BE

Key dates

• Filing date: Nov 19, 2013
• Grant date: Oct 25, 2016
• Expiry date: Nov 19, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C29/1285
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a continuous process for producing lower dialkyl carbonates as a main product and alkylene glycol as a by-product by transesterification of a cyclic alkylene carbonate (e.g. ethylene or propylene carbonate) with lower alkyl alcohols in the presence of a catalyst and also the necessary purification of the dialkyl carbonate in a subsequent process step. For optimization of the economic efficiency and energy efficiency of the process, additional devices are used for intermediate heating of the internal liquid streams within the apparatus.