公开(公告)号：DE3567857D1

公开(公告)日：1989-03-02

申请号：DE3567857

申请日：1985-03-22

Applicant: BASF AG

Inventor： SCHNEIDER HEINZ-WALTER DR ,  KUMMER RUDOLF DR ,  ZIMMERLING DIETER

IPC: C07C67/54 ,  C07C69/533

公开(公告)号：AT44956T

公开(公告)日：1989-08-15

申请号：AT86101378

申请日：1986-02-03

Applicant: BASF AG

Inventor： ZIMMERLING DIETER ,  SCHMIDT JOHANNES E DR ,  SEUBERT ROLF DR ,  FISCHER KARL DR ,  SAUER FRIEDRICH

IPC: C07D307/60 ,  C07C51/573

公开(公告)号：DE3504146A1

公开(公告)日：1986-08-07

申请号：DE3504146

申请日：1985-02-07

Applicant: BASF AG

Inventor： ZIMMERLING DIETER ,  SCHMIDT JOHANNES E DR ,  SEUBERT ROLF DR ,  FISCHER KARL DR ,  SAUER FRIEDRICH

IPC: C07D307/60 ,  C07C51/573

Abstract: 1. A process for obtaining very pure maleic anhydride having a stable color by fractional distillation of crude maleic anhydride, wherein the maleic anhydride vapor which has been separated off from low boilers and high boilers and contains not less than 98% by weight of maleic anhydride is partially condensed so that from 0,5 to 15% by weight of the maleic anhydride vapor is separated off from the vapor phase as a liquid precondensate, and the remaining very pure maleic anhydride vapor is then completely condensed.

公开(公告)号：DE3664633D1

公开(公告)日：1989-08-31

申请号：DE3664633

申请日：1986-02-03

Applicant: BASF AG

Inventor： ZIMMERLING DIETER ,  SCHMIDT JOHANNES E DR ,  SEUBERT ROLF DR ,  FISCHER KARL DR ,  SAUER FRIEDRICH

IPC: C07D307/60 ,  C07C51/573

Abstract: 1. A process for obtaining very pure maleic anhydride having a stable color by fractional distillation of crude maleic anhydride, wherein the maleic anhydride vapor which has been separated off from low boilers and high boilers and contains not less than 98% by weight of maleic anhydride is partially condensed so that from 0,5 to 15% by weight of the maleic anhydride vapor is separated off from the vapor phase as a liquid precondensate, and the remaining very pure maleic anhydride vapor is then completely condensed.

公开(公告)号：DE3412295A1

公开(公告)日：1985-10-03

申请号：DE3412295

申请日：1984-04-03

Applicant: BASF AG

Inventor： SCHNEIDER HEINZ-WALTER DR ,  KUMMER RUDOLF DR ,  ZIMMERLING DIETER

IPC: C07C67/54 ,  C07C69/533