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:
Dec. 14, 2004
Filed:
Jun. 04, 2003
Holger Borchert, Offstein, DE;
Stephan Schlitter, Limburgerhof, DE;
Rolf-Hartmuth Fischer, Heidelberg, DE;
Markus Rösch, Oppenheim, DE;
Frank Stein, Bad Dürkheim, DE;
Ralf-Thomas Rahn, Mannheim, DE;
Alexander Weck, Freinsheim, DE;
Gerd Kaibel, Lampertheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The present invention relates to a process for the gas-phase hydrogenation of C -dicarboxylic acids and/or their derivatives over a catalyst based on copper oxide to give substituted or unsubstituted &ggr;-butyrolactone and/or tetrahydrofuran, which comprises, which a first reaction zone in which the C -dicarboxylic acid and/or its derivatives is/are reacted to give a mixture comprising a substituted or unsubstituted &ggr;-butyrolactone as main product and a subsequent second reaction zone in which the substituted or unsubstituted &ggr;-butyrolactone present in the mixture from the first hydrogenation step is reacted at a temperature lower than the temperature in the first hydrogenation step to give substituted or unsubstituted tetrahydrofuran.