Utilization of an extracting agent as antifoaming agent in the production of anhydrous formic acid

US6838579B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Heinz Auer · Neulußheim, DE
• Bernd Bessling · Grünstadt, DE
• Hans Hammer · Mannheim, DE
• Hans Hasse · Kaiserslautern, DE
• Friedrich Sauer · Grünstadt, DE
• Maximilian Vicari · Schifferstadt, DE
• Gerhard Wagner · Brookline, US
• Till Adrian · Frankenthal (Pfalz), DE

Key dates

• Filing date: Jan 24, 2001
• Grant date: Jan 4, 2005
• Expiry date: Feb 1, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/48
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for obtaining anhydrous or substantially anhydrous formic acid in which, during the work-up, a compound of the general formula I where the radicals R1 and R2 are alkyl, cycloalkyl, aryl or aralkyl groups, or R1 and R2 jointly, together with the N atom, form a heterocyclic 5- or 6-membered ring, and only one of the radicals is an aryl group, and where R3 is hydrogen or a C1-C4-alkyl group,is employed simultaneously as extractant for formic acid and as antifoam for a distillation process.