公开(公告)号：AT302178T

公开(公告)日：2005-09-15

申请号：AT00958412

申请日：2000-08-10

Applicant: BASF AG

Inventor： PESCHEL WERNER ,  BESSLING BERND ,  REUTER PETER ,  LORZ PETER MICHAEL ,  ULRICH BERNHARD ,  KNAB JEAN 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.

公开(公告)号：DE19939880A1

公开(公告)日：2001-01-18

申请号：DE19939880

申请日：1999-08-23

Applicant: BASF AG

Inventor： WEICKENMEIER HEINZ ,  KNAB JEAN WERNER

IPC: F16K17/16 ,  F16L55/04

Abstract: The cage (1) for a burst plate traps the plate when it moves in the direction of least pressure (4). An impact plate (5) is attached to the cage at right angles to this direction.