Method for the production of organic carbonates

US7589227B2 · 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: Sep 15, 2009
• Expiry date: Nov 24, 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, wherein urea, substituted urea, a salt or an ester of carbamide acid or one of the N-substituted derivatives thereof is reacted in a first step in a polyalkylene glycol, a 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 is a number between (2) and (20), or in 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 are numbers between 1 and 20, or in mixtures of said compounds in the presence of a catalyst facilitating the separation of ammonia in order to form a mixture containing carbonates and carbamates, the ammonia becomes free or the amine is removed form the reaction mixture by means of a strip gas. In a second reaction step (transesterification), the mixture containing the carbonates and carbamates is reacted with a monomer alcohol or a phenol whereby monomer carbonates are formed and polymer polyalcohols of formulae (I) or (II) are reformed.HO—RnOH  (I)