Thermal separating process

US7150809B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Volker Diehl · Ellerstadt, DE
• Ulrich Jaeger · Münstermaifeld, DE
• Ulrich Hammon · Mannheim, DE
• Juergen Schroeder · Ludwigshafen, DE
• Steffen Rissel · Tauberbischofsheim, DE

Key dates

• Filing date: Apr 14, 2004
• Grant date: Dec 19, 2006
• Expiry date: Nov 4, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/22
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

(Meth)acrylic monomers are separated by a thermal separation process by ascending at least one ascending gaseous stream in a separating column containing a sequence of mass transfer trays and a liquid stream that contains dissolved polymerization inhibitor which descends in the separating column, and in at least one of the streams being (meth)acrylic monomers; and spraying the inner surface of the separating column with the descending liquid stream that contains the dissolved polymerization inhibitor, and the separating column having internals, certain areas of which are shadow regions of the sprayed descending liquid stream; and which shadow regions are equipped by covering means which prevent contact of the shadow regions with (meth)acrylic monomers and consequently undesired polymerization of monomer.