Catalysts for the preparation of phthalic anhydride
    6.
    发明授权
    Catalysts for the preparation of phthalic anhydride 失效
    催化剂用于制备水性非离子表面活性剂

    公开(公告)号:US3926846A

    公开(公告)日:1975-12-16

    申请号:US40628573

    申请日:1973-10-15

    摘要: A catalyst for the preparation of phthalic anhydride by vapor phase catalytic oxidation of either ortho-xylene or naphthalene with a molecular oxygen-containing gas which comprises a catalytically active substance supported on a porous inert carrier, said catalytically active substance comprising 1 to 20 parts by weight of V2O5 and, correspondingly, 99 to 80 parts by weight of TiO2 and, based on the total weight of the V2O5 and TiO2, 0.02 to 5.0 % by weight of Nb2O5, 0.1 to 5.0 % by weight of P2O5, 0 to 0.25 % by weight of K2O and 0 to 0.5% by weight of Cs2O, the total weight of K2O and Cs2O being at least 0.05 % by weight and optionally 0 to 5.0 % by weight of at least one member selected from the group consisting of rare earth elements, ZnO and Tl2O.

    Process for preparation of sulphonic acids
    8.
    发明授权
    Process for preparation of sulphonic acids 失效
    制备硫酸的方法

    公开(公告)号:US3660471A

    公开(公告)日:1972-05-02

    申请号:US3660471D

    申请日:1968-10-28

    CPC分类号: C07C309/00

    摘要: A PROCESS FOR PREPARATION OF MONOSULPHONIC ACIDS AT HIGH SELECTIVITY WHICH COMPRISES REACTING STRAIGHT-CHAIN PARAFFINIC HYDROCARBONS HAVING 10 TO 30 CARBON ATOMS WITH SULPHUR DIOXIDE AND OXYGEN TO PRODUCE THE CORRESPONDING SULPHONIC ACIDS, CHARACTERISED IN THAT THE REACTION IS CARRIED OUT UNDER SUCH CONDITIONS AS TO BRING ABOUT A HOMOGENEOUS REACTION LIQUID PHASE, I.E., THE CONCENTRATION OF SULPHUR DIOXIDE IN THE REACTION LIQUID PHASE BEING 7 TO 23% BY WEIGHT, THE REACTION TEMPERATURE BEING 17 TO 37*C., AND THE CONVERSION OF THE STRAIGHT-CHAIN PARAFFINIC HYDROCARBON BEING 1 TO 7%.