Ammoximation of ketones and work-up by pervaporation/vapor permeation

US6639108B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Thomas Schiffer · Haltern, DE
• Peter Esser · Recklinghausen, DE
• Martin Roos · Oestrich-Winkel, DE
• Franz-Felix Kuppinger · Marl, DE
• Günter Stevermüer · Marl, DE
• Georg Thiele · Hanau, DE

Key dates

• Filing date: Sep 3, 2002
• Grant date: Oct 28, 2003
• Expiry date: Sep 3, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2601/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for the work-up of a reaction mixture formed by ammoximation of a ketone, in particular an alkanone or cycloalkanone, by means of hydrogen peroxide and ammonia in homogeneous solution over a titanium-containing catalyst. It comprises the substeps removal of the catalyst, selective separation of the oxime formed in the ammoximation from the reaction mixture, removal of water of reaction and recirculation of the solvent. The work-up is carried out using at least one membrane separation step and is also successful in the case of incomplete ketone conversion and in the presence of dissolved salts.