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    2.
    发明专利
    未知

    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.

    6.
    发明专利
    未知

    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.

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