Process for purifying acrylonitrile effluent

US5091093A · kind A · utility

Assignee

• EC Erdolchemie GmbH · DE

Inventors

• Jens Herwig · Cologne, DE
• Arnd Stuwe · Leverkusen, DE
• Joachim Grub · Dormagen, DE

Key dates

• Filing date: Jul 3, 1991
• Grant date: Feb 25, 1992
• Expiry date: Jul 3, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2101/38
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The effluent arising in the production of acrylonitrile can be purified by adjusting it to a pH value from 4 to 9 and then subjecting it to reverse osmosis at a membrane at a temperature from 10.degree. to 50.degree. C. and a differential pressure of 10 to 80 bar. The flow velocity at the membrane is adjusted to a value from 0.5 to 4 m/second. The concentrate is recycled into the acrylonitrile production process.