Separation of propylene oxide from a mixture comprising propylene oxide and methanol

US7692031B2 · kind B2 · utility

Assignees

• BASF SE
• THE DOW CHEMICAL COMPANY · US

Inventors

• Hans-Georg Goebbel · Kallstadt, DE
• Henning Schultz · Mannheim, DE
• Peter Schultz · Phoenix, US
• Renate Patrascu · Stade, DE
• Malte Schulz · Stade, DE
• Meinolf Weidenbach · Stade, DE

Key dates

• Filing date: Jul 6, 2005
• Grant date: Apr 6, 2010
• Expiry date: Dec 9, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D301/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method of separating propylene oxide from a mixture (M) comprising propylene oxide and methanol, said method comprising: (i) introducing said mixture (M) into an extractive distillation column; (ii) additionally introducing an extracting solvent into said extractive distillation column; (iii) distilling propylene oxide overhead from said extractive distillation column as top stream; (iv) withdrawing a bottoms stream from said extractive distillation column; (v) compressing the top stream obtained overhead in (iii) by means of at least one compressor to give a compressed vapor.