Patent Number: 8,791,297

Title: Process for preparing formic acid by reaction of carbon dioxide with hydrogen

Abstract: A process for preparing formic acid by reaction of carbon dioxide (1) with hydrogen (2) in a hydrogenation reactor (I) in the presence of a catalyst comprising an element of group 8, 9 or 10 of the Periodic Table, a tertiary amine comprising at least 12 carbon atoms per molecule and a polar solvent comprising one or more monoalcohols selected from among methanol, ethanol, propanols and butanols and also water, to form formic acid/amine adducts as intermediates which are subsequently thermally dissociated, with work-up of the output (3) from the hydrogenation reactor (I) in a plurality of process steps, where a tertiary amine-comprising stream (13) from the work-up is used as selective solvent for the catalyst, is proposed.

Inventors: Schaub; Thomas (Neustadt, DE), Fries; Donata Maria (Mannheim, DE), Paciello; Rocco (Bad Durkheim, DE), Mohl; Klaus-Dieter (Hockenheim, DE), Schafer; Martin (Grunstadt, DE), Rittinger; Stefan (Mannheim, DE), Schneider; Daniel (Mannheim, DE)

Assignee: BASF SE

International Classification: C07C 51/44 (20060101)

Expiration Date: 7/29/12018