Process for obtaining acrylic acid

US9458080B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Nicolai Tonio Woerz · Darmstadt, DE
• Lukas SCHULZ · Mannheim, DE
• Tim Blaschke · Stuttgart, DE
• Marco Hartmann · Jockgrim, DE
• Feelly Ruether · Ludwigshafen, DE
• Yan Li · Fremont, US

Key dates

• Filing date: Dec 3, 2015
• Grant date: Oct 4, 2016
• Expiry date: Dec 3, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C67/343
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for obtaining acrylic acid, comprising (a) providing a liquid stream S7 comprising acetic acid and acrylic acid, where the molar ratio of acetic acid to acrylic acid in stream S7 is greater than 1:1, (b-1) crystallizing a portion of the acetic acid present in stream S7 to obtain solid crystallized acetic acid in its mother liquor, (b-2) separating the mother liquor from the acetic acid crystallized in (b-1) to obtain the solid crystallized acetic acid and a liquid stream S8 comprising acrylic acid and acetic acid, (c) separating stream S8 into at least one stream S10 depleted of acrylic acid compared to S8 and a stream S11 enriched in acrylic acid compared to S8.