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:
Apr. 23, 2013
Filed:
Jun. 25, 2010
Thomas Schaub, Neustadt, DE;
Rocco Paciello, Bad Duerkheim, DE;
Klaus-dieter Mohl, Hockenheim, DE;
Daniel Schneider, Mannheim, DE;
Martin Schaefer, Gruenstadt, DE;
Stefan Rittinger, Mannheim, DE;
Thomas Schaub, Neustadt, DE;
Rocco Paciello, Bad Duerkheim, DE;
Klaus-Dieter Mohl, Hockenheim, DE;
Daniel Schneider, Mannheim, DE;
Martin Schaefer, Gruenstadt, DE;
Stefan Rittinger, Mannheim, DE;
BASF SE, Ludwigshaden, DE;
Abstract
Process for preparing formic acid by hydrogenation of carbon dioxide in the presence of a catalyst comprising an element of group 8, 9 or 10 of the Periodic Table, a tertiary amine and a polar solvent at a pressure of from 0.2 to 30 MPa abs and a temperature of from 20 to 200° C. to form two liquid phases, separation of the two liquid phases, wherein the liquid phase (B) enriched with the tertiary amine is recirculated to the hydrogenation reactor and the formic acid/amine adduct from the liquid phase (A) enriched with the formic acid/amine adduct and the polar solvent is thermally dissociated into free formic acid and free tertiary amine in a distillation unit and the tertiary amine liberated in the dissociation and the polar solvent are recirculated to the hydrogenation reactor.