Process for reclaiming methacrylic acid from a high-boiler phase and an aqueous phase

US9162962B2 · kind B2 · utility

Assignee

• Evonik Röhm GmbH · DE

Inventors

• Henning Schaefer · Darmstadt, DE
• Torsten Balduf · Pfungstadt, DE
• Patrick Peter · Darmstadt, DE

Key dates

• Filing date: Sep 16, 2011
• Grant date: Oct 20, 2015
• Expiry date: Sep 16, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/48
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for reclaiming methacrylic acid from a high-boiler phase in a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid comprising the following steps a) Providing a high-boiler phase from a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid b) Providing an aqueous phase, preferably organically loaded, from a heterogeneously catalysed gas phase oxidation of a C4-compound to methacrylic acid c) Mixing of components a) and b) optionally followed by filtration or centrifugation d) Adding an extraction media to the mixture from c) e) Subjecting the multiple-phase mixture from d) to at least one mixer-settler extraction process f) Recycling the organic phase from the last mixer-settler process back into the C4-process