公开(公告)号：MY122327A

公开(公告)日：2006-04-29

申请号：MYPI20003800

申请日：2000-08-18

Applicant: BASF AG

Inventor： PESCHEL WERNER DR ,  BESSLING BERND ,  REUTER PETER DR ,  LORZ PETER MICHAEL DR ,  ULRICH BERNHARD DR ,  KNAB JEAN WERNER ,  KUMMER MATTHIAS DR ,  XDCHL THOMAS R DR

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

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.