21.
    发明专利
    未知

    公开(公告)号:ATA220278A

    公开(公告)日:1981-12-15

    申请号:AT220278

    申请日:1978-03-29

    Abstract: Maleic anhydride is produced by the oxidation of 1,3-butadiene, n-butylenes, crotonaldehyde and furan with molecular oxygen in the vapor phase in the presence of catalytic oxides of antimony, molybdenum, at least one element selected from the group consisting of niobium, zirconium, titanium and tantalum and optionally a reducing agent capable of reducing at least part of the molybdenum in the catalyst to a valence state below +6 selected from the group consisting of hydrazine hydrate, molybdenum, tungsten, magnesium, aluminum, and nickel. This catalyst may optionally contain one or more elements selected from the group consisting of Li, Ag, Ce, Cd, Co, As, Si, Zn, Ge, Bi, Ru, Pt, U, Al and Ni. Especially desirable yields of maleic anhydride are obtained from 1,3-butadiene in the presence of a catalyst wherein molybdenum metal is used as a reducing agent.

    PREPARATION OF MALEIC ANHYDRIDE FROM FOUR-CARBON HYDROCARBONS

    公开(公告)号:CA1083165A

    公开(公告)日:1980-08-05

    申请号:CA286647

    申请日:1977-09-13

    Abstract: PREPARATION OF MALEIC ANHYDRIDE FROM FOUR-CARBON HYDROCARBONS Maleic anhydride is produced by the oxidation of n-butane, n-butenes, 1,3-butadiene with molecular oxygen in the vapor phase in the presence of catalysts containing molybdenum, phosphorus, oxygen and the following components delineated in Groups I to IV: (I) bismuth, copper and a halogen selected from the group consisting of chlorine, bromine or iodine; or (II) arsenic and at least one element selected from the group consisting of Sn, rare earth metal, Zr, Rh, Mn, Re, Ru, Cu, Pb, Zn, Ti, Cr, Nb, Al, Ga and alkaline earth metal; or (III) at least one element selected from the group consisting of As, Rb, Pd, Cd, Cs, Tl and In; or (IV) rubidium, and at least one element selected from the group consisting of Sn, rare earth element, Ni, Zr, Ba, Fe, Rh, Mn, Re, Ru, Co and Cu.

    PROCESS FOR THE SYNTHESIS OF MALEIC ANHYDRIDE

    公开(公告)号:CA1079291A

    公开(公告)日:1980-06-10

    申请号:CA269851

    申请日:1977-01-17

    Abstract: Maleic anhydride and acrylic acid are produced by the oxidation of 1,3-butadiene, n-butylenes, crotonaldehyde and furan with molecular oxygen in the vapor phase in the presence of a catalytic oxide of antimony, molybdenum, vanadium and lithium, cerium, or mixture thereof, wherein one element selected from the group consisting of calcium, iron, tungsten, magnesium, aluminum and nickel is optionally added as a reducing agent. The oxidation of 1,3-butadiene in the presence of a catalyst wherein tungsten metal is used as a reducing agent gives especially desirable high yields to maleic anhydride.

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