Process for preparing acrylic acid

US10479751B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Jurgen Mosler · Marl, DE
• Christian Psiorz · Essen, DE
• Franz-Felix Kuppinger · Marl, DE
• Raphael Schriewer · Laer, DE
• Arnd Bruhns · Borgholzhausen, DE
• Armin Matthias Rix · Marl, DE
• Peter Kreis · Dortmund, DE
• Ralf Meier · Dortmund, DE
• James Elder · Houston, US

Key dates

• Filing date: Aug 11, 2014
• Grant date: Nov 19, 2019
• Expiry date: Aug 11, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/3325
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention provides an apparatus comprising a feed arranged below the middle of the apparatus, a quenching agent inlet arranged above the feed, an outlet arranged below the feed and a draw arranged above the quenching agent inlet, the apparatus having a region provided with one or more packing elements, wherein at least one means which ensures the formation of a liquid layer having a height of at least 1 cm is present between the quenching agent inlet and a packing element present between the quenching agent inlet and feed. The present invention also provides a process for preparing acrylic acid, which includes a step of oxidizing acrolein, wherein the reaction mixture obtained in this oxidation is contacted with water as quenching agent in an inventive apparatus, and a composition obtainable as bottom product in the process according to the invention, comprising acrylic acid and water.