公开(公告)号：DE19823275A1

公开(公告)日：1999-12-02

申请号：DE19823275

申请日：1998-05-26

Applicant: BASF AG

Inventor： HEIDEMANN THOMAS ,  ARNOLD HEIKO ,  HEFELE GERHARD ,  WANJEK HERBERT

IPC: C07D307/89 ,  C07C51/265 ,  C07C51/31 ,  C07C63/16 ,  B01J27/198

Abstract: The invention relates to a method for producing phthalic anhydride by means of catalytic vapor-phase oxidation of o-xylol/naphthalene mixtures with molecular oxygen while using a catalyst (I) situated in a first layer on the gas entry side, said layer amounting to 25 to 75 percentage by volume of the total catalyst volume, containing, each time with regard to the catalytically effective mass, 1 to 10 wt.% vanadium oxide (calculated as V2O5), 1 to 10 wt.% antimony oxide (calculated as Sb2O3) and 80 to 98 wt.% titanium dioxide of the anatase type with a BET surface of 13 to 28 m /g, and 0.05 to 1 wt.% cesium (calculated as Cs), deposited on a steatite support. In addition, the phthalic anhydride is produced by using a catalyst (II) situated in a second layer, said layer amounting to the remaining 75 to 25 percent by volume of the total catalyst volume, containing, each time with regard to the catalytically effective mass, 1 to 10 wt.% vanadium oxide (calculated as V2O5), 1 to 10 wt.% antimony oxide (calculated as Sb2O3) and 80 to 98 wt.% titanium dioxide of the anatase type with a BET surface of 13 to 28 m /g, 0.01 to 1 wt.% phosphorous oxide (calculated as P) and 0.01 to 0.2 wt.% cesium (calculated as Cs), deposited on a steatite support. The cesium content of catalyst (II) is less than 15 wt.% of the cesium content of catalyst (I), and catalyst (I) and catalyst (II) are produced without adding compounds of niobium.

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.