| 摘要 |
Olefins are oxidized to aldehydes or in the presence of ammonia to unsaturated nitriles using supported or unsupported antimony/uranium catalysts. If desired both nitriles and aldehydes may be produced simultaneously. The reactants used may comprise oxygen and an olefin having only 3 carbon atoms in a straight chain e.g. propylene, isobutylene or mixtures thereof. The olefins may be in admixture with paraffins e.g. ethane, propane, butane and pentane. A propylene-propane-oxygen mixture may constitute the feed gas. Examples are given which describe the preparation of achelein, acrylonitrile methacrylonitrile methachelein and methacrylic acid as main products and acetonitrile as by-product. Specifications 864,666, 867,438 and 876,446 are referred to.ALSO:The oxidative dehydrogenation of olefins to diolefins and aromatics is effected in the presence of supported or unsupported Sb/U catalysts. Specified olefins which may be dehydrogenated are butene-1, butene-2 pentenes 1 and 2, 2 methyl pentene-1, 3 methyl butene 1, 2 methyl butene 2, hexene-1, hexene-2, 4 methyl pentene 1, 3 : 4 dimethyl-pentene-1, 4-methyl pentene 2, heptene-1, octene-1, cyclopentene, cyclohexene, 3 methyl cyclohexene, and cycloheptene. The amount of oxygen used should be from 0.3-3.0 mols. per mol. of olefin. The gasous feed may additionally contain one or more paraffinic or naphthenic hydrocarbon or steam, carbon dioxide or nitrogen. Examples 17, 18 and 19 describe the conversion of butenes to butadiene. Specifications 864,666, 867,438 and 876,446 are referred to.ALSO:An oxidation catalyst comprises oxides of Sb and U such that the metals atomic ratio is within the range 1 : 50-99 : 1. The catalyst may be used per se or supported on silica, alumina, zirconia, "Alundum" (Registered Trade Mark), silicon carbide, alumina-silica or on stable phosphates, silicates, aluminates, borates and carbonates. The catalyst may be made by blending oxides of metals, dissolving metals in nitric acid or hydrolysing salts of metals. Regeneration may be effected by heating the catalyst in air. Examples are given. Specifications 864,666, 867,438 and 876,446 are referred to. |
