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    Method for producing maleic acid anhydride
    21.
    发明专利
    Method for producing maleic acid anhydride 未知

    公开(公告)号：AU5036301A

    公开(公告)日：2001-09-24

    申请号：AU5036301

    申请日：2001-03-06

    Applicant: BASF AG

    Inventor： WEIGUNY JENS ,  STORCK SEBASTIAN ,  TENTEN ANDREAS ,  RUPPEL WILHELM

    IPC: C07D307/60 ,  B01J27/28 ,  B01J38/04 ,  C07B61/00 ,  C07C51/215

    Abstract: In a process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of hydrocarbons having at least four carbon atoms using oxygen-containing gases in the presence of a volatile phosphorus compound over a catalyst comprising vanadium, phosphorus and oxygen in a shell-and-tube reactor unit having at least two successive cooled reaction zones, the temperature of the first reaction zone is from 350 to 450° C. and the temperature of the second and further reaction zones is from 350 to 480° C. and the temperature difference between the hottest reaction zone and the coolest reaction zone is at least 2° C.

    22.
    发明专利
    未知

    公开(公告)号：BRPI0517850A

    公开(公告)日：2008-10-21

    申请号：BRPI0517850

    申请日：2005-11-16

    Applicant: BASF AG

    Inventor： NETO SAMUEL ,  STORCK SEBASTIAN ,  ZUEHLKE JUERGEN ,  ROSOWSKI FRANK

    IPC: B01J23/00 ,  B01J21/06 ,  B01J23/22 ,  B01J35/00 ,  B01J35/10 ,  B01J37/02 ,  C07C51/00

    Abstract: Catalytic titanium dioxide mixtures comprising: a first anatase titanium dioxide having a BET surface area greater than 15 m2/g and a hydrogen uptake for the reduction of Ti4+ to Ti3+ of from 5 to 20 μmol/m2; and a second anatase titanium dioxide having a BET surface area less than or equal to 15 m2/g and a hydrogen uptake for the reduction of Ti4+ to Ti3+ of from 0.6 to 7 μmol/m2, processes for preparing catalysts containing the same, catalysts containing active compositions including such titanium dioxide mixtures on support materials, and catalyst systems using the same.

    28.
    发明专利
    未知

    公开(公告)号：DE502004001431D1

    公开(公告)日：2006-10-19

    申请号：DE502004001431

    申请日：2004-05-15

    Applicant: BASF AG

    Inventor： NETO SAMUEL ,  ZUEHLKE JUERGEN ,  STORCK SEBASTIAN ,  ROSOWSKI FRANK

    IPC: C07C51/31 ,  C07C51/21 ,  C07C51/265 ,  C07D307/89

    Abstract: The invention relates to a process for preparing phthalic anhydride, in which the catalytic gas-phase oxidation of o-xylene and/or naphthalene is carried out over at least three zones of catalysts of increasing activity, with only the last zone of the catalyst system containing phosphorus and the last zone also comprising at least 10% by weight of vanadium (calculated as V 2 O 5 ) based on the active composition of the catalyst and having a ratio of vanadium (calculated as V 2 O 5 ) to phosphorus of greater than 35.

    29.
    发明专利
    未知

    公开(公告)号：AT338741T

    公开(公告)日：2006-09-15

    申请号：AT04733248

    申请日：2004-05-15

    Applicant: BASF AG

    Inventor： NETO SAMUEL ,  ZUEHLKE JUERGEN ,  STORCK SEBASTIAN ,  ROSOWSKI FRANK

    IPC: C07C51/265 ,  C07C51/31 ,  C07D307/89 ,  C07C51/21

    Abstract: The invention relates to a process for preparing phthalic anhydride, in which the catalytic gas-phase oxidation of o-xylene and/or naphthalene is carried out over at least three zones of catalysts of increasing activity, with only the last zone of the catalyst system containing phosphorus and the last zone also comprising at least 10% by weight of vanadium (calculated as V 2 O 5 ) based on the active composition of the catalyst and having a ratio of vanadium (calculated as V 2 O 5 ) to phosphorus of greater than 35.

    30.
    发明专利
    未知

    公开(公告)号：DE10323461A1

    公开(公告)日：2004-12-09

    申请号：DE10323461

    申请日：2003-05-23

    Applicant: BASF AG

    Inventor： STORCK SEBASTIAN ,  ZUEHLKE JUERGEN ,  NETO SAMUEL ,  ROSOWSKI FRANK

    IPC: C07C51/265 ,  C07C51/31 ,  C07B41/00 ,  C07D307/92 ,  C07B41/06 ,  C07B41/08 ,  C07B41/12 ,  B01J8/04 ,  B01J27/198 ,  B01J23/22

    Abstract: A description is given of a process for preparing aldehydes, carboxylic acids and/or carboxylic anhydrides, in particular phthalic anhydride, in which a gaseous stream comprising an aromatic hydrocarbon and molecular oxygen is passed at elevated temperature over a bed of a first catalyst and a bed which is made up of a second catalyst having a higher activity than the first catalyst and is located downstream of the first catalyst in the flow direction of the gaseous stream, wherein the catalytically active composition of the first catalyst comprises at least vanadium oxide, titanium dioxide and antimony oxide and the ratio of vanadium, calculated as V 2 O 5 , to antimony, calculated as Sb 2 O 3 , in the first catalyst is from 3.5:1 to 5:1. The source of antimony oxide used for the first catalyst is preferably particulate antimony trioxide having a mean particle size of from 0.5 to 5 mum. The process allows the desired oxidation products to be obtained in high yield over longer periods of time.

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