The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2005
Filed:
Jan. 24, 2001
Heinz Auer, Neulussheim, DE;
Bernd Bessling, Grosse Ille, MI (US);
Hans Hammer, Mannheim, DE;
Hans Hasse, Kaiserslautern, DE;
Friedrich Sauer, Obersülzen, DE;
Maximilian Vicari, Limburgerhof, DE;
Gerhard Wagner, Ludwigshafen, DE;
Till Adrian, Bobenheim-Roxheim, DE;
Heinz Auer, Neulussheim, DE;
Bernd Bessling, Grosse Ille, MI (US);
Hans Hammer, Mannheim, DE;
Hans Hasse, Kaiserslautern, DE;
Friedrich Sauer, Obersülzen, DE;
Maximilian Vicari, Limburgerhof, DE;
Gerhard Wagner, Ludwigshafen, DE;
Till Adrian, Bobenheim-Roxheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
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 Iwhere 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.