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    • 6. 发明授权
    • Preparation of maleic anhydride
    • 马来酸酐的制备
    • US4350639A
    • 1982-09-21
    • US258712
    • 1981-04-29
    • Ernest C. MilbergerNoel J. BremerDennis E. Dria
    • Ernest C. MilbergerNoel J. BremerDennis E. Dria
    • B01J23/22B01J27/198C07C51/215C07D307/60
    • C07C51/215B01J23/002B01J23/22B01J27/198B01J2523/00
    • The present invention provides improved oxidation catalysts containing mixed oxides of vanadium and phosphorus and the method for the preparation thereof, which catalysts are particularly effective in the oxidation of n-butane, n-butenes, 1,3-butadiene or a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce excellent yields of maleic anhydride with very good selectivity. At least one vanadium compound, a substantial portion of which is in the pentavalent state, and at least one phosphorus-containing compound is added to an organic liquid medium capable of reducing at least a portion of the vanadium to a +4 valence state, to form a reaction mixture. Partial reduction of the vanadium is effected in the presence of the phosphorus-containing compound and a highly ordered and uniform mixed vanadium phosphorus oxide-containing catalyst precursor is formed.
    • 本发明提供了含有钒和磷的混合氧化物的改进的氧化催化剂及其制备方法,该催化剂在正丁烷,正丁烯,1,3-丁二烯或其与分子的混合物中的氧化中特别有效 氧气或含氧气体,以非常好的选择性产生优异的马来酸酐产率。 将至少一种钒化合物(其大部分为五价态)和至少一种含磷化合物加入到能够将至少一部分钒还原成+4价态的有机液体介质中,至 形成反应混合物。 在含磷化合物的存在下进行钒的部分还原,形成高度均匀的混合的含氧化钒的催化剂前体。