1.
    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

    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.

    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

    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.

    METHOD AND DEVICE FOR PRODUCTION OF A HOMOGENEOUS MIXTURE OF A VAPOUR-FORMING AROMATIC HYDROCARBON AND AN OXYGEN-CONTAINING GAS

    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

    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

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