Process for the fractional separation of (meth)acrylic acid from a mixture containing (meth)acrylic acid

US5637222A · kind A · utility

Assignee

• BASF SE

Inventors

• Holger Herbst · Bischofswerda, DE
• Gerhard Nestler · Ludwigshafen, DE
• Ulrich Hammon · Mannheim, DE

Key dates

• Filing date: Jan 11, 1996
• Grant date: Jun 10, 1997
• Expiry date: Jan 11, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/44
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the fractional separation of (meth)acrylic acid from a mixture containing (meth)acrylic acid, in which (meth)acrylic acid is tapped off from the rectifying column at a point above the level at which the liquid mixture containing (meth)acrylic acid enters the rectifying column, and at at least one point of the rectifying column the reflux liquid descending therein is tapped off from the rectifying column, oligomerized and/or polymerized (meth)acrylic acid present therein is separated and the reflux liquid is subsequently recycled to the rectifying column.