Process for inhibiting unwanted free-radical polymerization of acrylic acid present in a liquid phase P

US9096513B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Till Blum · Kuantan, MY
• Peter Zurowski · Landau, DE
• Tobias Johannes Korn · Ludwigshafen, DE
• Sylke Haremza · Neckargemünd, DE
• Thorsten Friese · Mannheim, DE
• Friedrich-Georg Martin · Heidelberg, DE
• Ulrich Jager · Lichtenfels, DE
• Steffen Rissel · Tauberbischofsheim, DE
• Volker Schliephake · Schifferstadt, DE

Key dates

• Filing date: Oct 5, 2011
• Grant date: Aug 4, 2015
• Expiry date: Nov 9, 2031

Classification

• Technology area (CPC —): General

Abstract

A process for inhibiting unwanted free-radical polymerization of acrylic acid present in a liquid phase P whose acrylic acid content is at least 10% by weight and which, based on the weight of the acrylic acid present therein, additionally comprises at least 100 ppm by weight of propionic acid and at least 100 ppm by weight of glyoxal, in which at least one chemical compound of the element copper is added to the liquid phase P, and the resulting liquid phases P to which a chemical compound of the element copper has been added.