公开(公告)号：DE19707943C2

公开(公告)日：1999-07-08

申请号：DE19707943

申请日：1997-02-27

Applicant: BASF AG

Inventor： HEFELE GERHARD ,  KRATZER OTTO DR ,  SCHEIDMEIR WALTER DR ,  ULRICH BERNHARD DR

IPC: B01J23/04 ,  B01J23/22 ,  B01J37/02 ,  C07C51/255 ,  C07C51/265 ,  C07C51/31 ,  C07D307/89 ,  B01J35/08

Abstract: In a process for preparing phthalic anhydride by catalytic gas-phase oxidation of o-xylene or naphthalene or o-xylene/naphthalene mixtures with a gas comprising molecular oxygen over a coated catalyst comprising an inert, nonporous support material on which a catalytically active composition comprising titanium dioxide and vanadium pentoxide is applied in layer form, a catalyst whose catalytically active composition comprises from 3 to 6% by weight of vanadium pentoxide, calculated as V2O5, from 0.3 to 0.5% by weight of a cesium compound, calculated as Cs, and the remainder to 100% by weight of titanium dioxide in the anatase modification is used in the presence or absence of a coated catalyst, differing therefrom, for the catalytic gas-phase oxidation of o-xylene or naphthalene or o-xylene/naphthalene mixtures and, in the presence of such a second catalyst, the latter is used in a combined bed with the catalyst of the above composition in the reactor.

公开(公告)号：DE19707943A1

公开(公告)日：1998-09-03

申请号：DE19707943

申请日：1997-02-27

Applicant: BASF AG

Inventor： HEFELE GERHARD ,  KRATZER OTTO DR ,  SCHEIDMEIR WALTER DR ,  ULRICH BERNHARD DR

IPC: B01J23/04 ,  B01J23/22 ,  B01J37/02 ,  C07C51/255 ,  C07C51/265 ,  C07C51/31 ,  C07D307/89 ,  B01J35/08

Abstract: The invention relates to a method for producing acid phthalic anhydride by catalytic gas phase oxidation of o-xylol or naphthalene or o-xylol/naphthalene mixtures with a molecular gas containing oxygen on a shell catalyst consisting of an inert, non-porous carrier material to which a coating of a catalytically active mass containing titanium dioxide and vanadium pentoxide is applied, wherein a catalyst is used whose catalytically active mass consists of 3 to 6 wt. % of vanadium pentoxide calculated as V2O5, 0.3 to 0.5 wt. % of a cesium compound calculated as Cs, and the remainder up to 100 wt. % of titanium dioxide anastase modification, in the presence or absence of a catalyst in the form of a shell differing from the above-mentioned catalyst which is used to produce gas-phase oxidation of o-xylol or naphthalene or o-xylol/naphthalene mixtures. In the presence of a second catalyst of this type, said catalyst is introduced to the reactor with the catalyst of the above-mentioned composition in a combined charge.

公开(公告)号：DE3935796A1

公开(公告)日：1991-05-02

申请号：DE3935796

申请日：1989-10-27

Applicant: BASF AG

Inventor： HOFFMANN HERWIG DR ,  ROEPER MICHAEL DR ,  SCHULZE JOACHIM DR ,  STROHMEYER MAX DR ,  ULRICH BERNHARD DR

IPC: B01J21/16 ,  B01J31/14 ,  C07B61/00 ,  C07C2/30 ,  C07C29/141 ,  C07C29/16 ,  C07C31/125 ,  C07C67/08 ,  C07C69/80

公开(公告)号：MY125936A

公开(公告)日：2006-09-29

申请号：MYPI20005923

申请日：2000-12-15

Applicant: BASF AG

Inventor： BLOCK ULRICH DR ,  SEUBERT ROLF DR ,  ULRICH BERNHARD DR ,  WUNSCHMANN HELMUT

IPC: B01F23/10

Abstract: A PROCESS AND APPARATUS FOR PRODUCING A HOMOGENEOUS MIXTURE OF A GASEOUS AROMATIC HYDROCARBON AND AN OXYGEN-CONTAINING GAS FOR CATALYTIC GAS-PHASE REACTIONS, IN PARTICULAR A HOMOGENEOUS MIXTURE OF GASEOUS O-XYLENE AND/OR NAPHTHALENE AND AIR FOR PREPARING PHTHALIC ANHYDRIDE, ARE PROVIDED. THE LIQUID AROMATIC HYDROCARBON IS ATOMIZED TO FORM DROPLETS HAVING A DIAMETE OF LESS THAN 1 MM AND INJECTED INTO AN OXYGEN-CONTAINING GAS STREAM (12) PREHEATED TO ABOVE THE BOILING POINT OF THE AROMATIC HYDROCARBON. ACCORDING TO THE INVENTION, THE LIQUID AROMATIC HYDROCARBON IS ATOMIZED BY MEANS OF NOZZLES (15) WHICH FORM A HOLLOW CONE (16), PREFERABLY BY MEANS OF SWIRL NOZZLES. THE O-XYLENE/AIR MIXTURE IS ADVANTAGEOUSLY PRODUCED IN A CHAMBER WHICH IS BOUNDED BY SIDE WALLS (18) HEATED TO ABOVE THE BOILING POINT OF THE HYDROCARBON

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.