Process for redissociating Michael adducts which are present in a liquid F and have been formed in the preparation of acrylic acid or esters thereof

US8263802B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Volker Schliephake · Schifferstadt, DE
• Thorsten Friese · Mannheim, DE
• Klaus Bott · Ludwigshafen, DE
• Michael Blechschmitt · Schifferstadt, DE
• Till Blum · Kuantan, MY
• Klaus Joachim Mueller-Engel · Blankenloch, DE

Key dates

• Filing date: Dec 9, 2009
• Grant date: Sep 11, 2012
• Expiry date: Nov 24, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for redissociating Michael adducts which are present in a liquid F with a proportion by weight of ≧10% by weight and have been formed in the preparation of acrylic acid or esters thereof in a redissociating apparatus which comprises a pump P, a separating column K with separating internals and a circulation heat exchanger UW, wherein, for the purpose of supplying the cleavage energy, the pump P sucks in bottoms liquid from the bottom space of the separating column K and, via the circulation heat exchanger UW, continually recycles it into the bottom space above the level of the bottoms liquid, and wherein the pump P is a radial circulation pump with an open impeller.