公开(公告)号：DE59802158D1

公开(公告)日：2001-12-20

申请号：DE59802158

申请日：1998-07-03

Applicant: BASF AG

Inventor： BESSLING BERND ,  KNAB WERNER ,  BROX WOLFGANG ,  LOHE BERND

IPC: C07C7/148 ,  C07C11/09

公开(公告)号：DE50010982D1

公开(公告)日：2005-09-22

申请号：DE50010982

申请日：2000-08-10

Applicant: BASF AG

Inventor： PESCHEL WERNER ,  BESSLING BERND ,  REUTER PETER ,  LORZ MICHAEL ,  ULRICH BERNHARD ,  KNAB WERNER ,  KUMMER MATTHIAS ,  RUEHL THOMAS

IPC: B01D3/00 ,  B01D3/10 ,  B01D3/14 ,  C07C51/573 ,  C07C63/16 ,  C07D307/89

Abstract: On-spec phthalic anhydride is prepared by distillative purification of crude phthalic anhydride by a process in which crude phthalic anhydride is fed to a distillation column which is operated at reduced pressure, the low boilers are removed at the top or in the vicinity of the top of the distillation column and the on-spec phthalic anhydride is removed from the column via a side take-off.