公开(公告)号：DE10225929A1

公开(公告)日：2003-12-24

申请号：DE10225929

申请日：2002-06-11

Applicant: BASF AG

Inventor： ROESCH MARKUS ,  HESSE MICHAEL ,  SCHLITTER STEPHAN MARCEL ,  BOTTKE NILS ,  FISCHER ROLF HARTMUTH ,  WECK ALEXANDER ,  WINDECKER GUNTHER ,  HEYDRICH GUNNAR ,  BORCHERT HOLGER ,  SCHUBERT MARKUS

IPC: C07B61/00 ,  C07C29/149 ,  C07C31/20 ,  C07C29/132 ,  C07D307/20 ,  C07D307/32

Abstract: Optionally alkyl-substituted 1,4-butanediol is prepared from C 4 -dicarboxylic acids and/or of derivatives thereof by: a) introducing a gas stream of the C 4 -dicarboxylic acid or the derivative thereof in a first reactor in the gas phase to obtain a product which contains mainly optionally alkyl-substituted gamma-butyro-lactone; b) removing succinic anhydride from the product of step a); c) catalytically hydrogenating the product of step b) in a second reactor in the gas phase to obtain optionally alkyl-substituted 1,4-butanediol; d) removing the desired product from intermediates, by-products and any unconverted reactants; and e) optionally recycling unconverted intermediates into one or both hydrogenation stages. The catalysts employed in each of the hydrogenation stages comprise