Method for the production of organic carbonates

US7598410B2 · kind B2 · utility

Assignee

• Lurgi GmbH · DE

Inventors

• Henning Buchold · Hanau, DE
• Jürgen Eberhardt · Rodgau, DE
• Ulrich Wagner · Bernburg, DE
• Hans-Jörg Wölk · Rosenheim, DE

Key dates

• Filing date: Jul 16, 2004
• Grant date: Oct 6, 2009
• Expiry date: Oct 27, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for the production of monomer organic carbonates from a mixture of organic carbonates and carbamates which are obtained by reacting urea, substituted urea, a salt or ester of carbamide acid or one of the N-substituted derivatives thereof with a polyalkylene glycol, polyester-polyol or a polyether-polyol of general formula (I), wherein R represents a linear or branched alkylene group having 2-12 carbon atoms and n represents a number between 2 and 20, or with a completely or partially hydrolysed polyvinyl alcohol of general formula (II), wherein R′ represents an alkyl group, an aryl group or an acyl group having 1-12 carbon atoms, p and q represent a number between 120, or with mixtures of said compounds in the presence of a catalyst facilitating the separation of ammonia and the ammonia becomes free or the amine is removed from the reaction mixture by means of a strip gas, whereby said mixture is reacted with an alcohol or a phenol whereby monomer carbonates are formed and polymer polyalcohols of formulae (I) or (II) are reformed.