公开(公告)号：DE4435176A1

公开(公告)日：1996-04-04

申请号：DE4435176

申请日：1994-09-30

Applicant: BASF AG

Inventor： GROENING CARSTEN DR ,  EBEL KLAUS DR ,  KAIBEL GERD DR ,  THERRE JOERG DR ,  KOOPMANN JUERGEN DR ,  MENIG HELMUTH DR ,  FRITZ GERHARD DR ,  DIETZ RAINER

IPC: B01J31/08 ,  C07B61/00 ,  C07C45/64 ,  C07C45/71 ,  C07C45/84 ,  C07C49/175

Abstract: Prepn. of methyl glyoxal dimethyl acetal comprises reacting methyl glyoxal and methanol in the presence of a catalyst, in which the acetal is recovered by heating in the presence of water to bring about azeotropic distillation.

公开(公告)号：AT135247T

公开(公告)日：1996-03-15

申请号：AT93112467

申请日：1993-08-04

Applicant: BASF AG

Inventor： KAIBEL GERD DR

IPC: B01J19/00 ,  B01D3/14

公开(公告)号：DE4418648A1

公开(公告)日：1995-11-30

申请号：DE4418648

申请日：1994-05-27

Applicant: BASF AG

Inventor： KAIBEL GERD DR ,  STOPS PETER DIPL ING ,  ENSEN HEINZ DIPL ING

IPC: B01D3/14 ,  C07C29/80 ,  C07C33/035 ,  C07C33/046 ,  C07B63/00

Abstract: A process for carrying out a separation by batch distillation, involves taking several fractions simultaneously from the original mixture and further sepg. the heads and bottoms mixtures by subsequent bath distillations.