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    • 3. 发明授权
    • Method for producing catalysts for gas phase oxidation of saturated
and/or unsaturated C.sub.4 -hydrocarbons to maleic anhydride
    • 用于生产饱和和/或不饱和C 4烃至马来酸酐的气相氧化催化剂的方法
    • US4382876A
    • 1983-05-10
    • US244112
    • 1981-03-16
    • Kurt NeuboldKlaus-Dieter Gollmer
    • Kurt NeuboldKlaus-Dieter Gollmer
    • C07D307/60B01J23/22B01J27/18B01J27/198C01B25/45C07B61/00C07C51/215C07C51/25B01J27/14
    • C07C51/252B01J23/002B01J23/22B01J27/198C07C51/215B01J2523/00
    • A method for producing catalysts for gas phase oxidation of saturated or unsaturated hydrocarbons to maleic anhydride is disclosed comprising: (a) mixing a vanadium compound containing pentavalent vanadium with orthophosphoric acid in an alcohol from the series of monohydric lower aliphatic alcohols having 2-8 C-atoms in the optional presence of promoters, and a reducing agent combination of H.sub.3 PO.sub.3 +alcohol wherein the sum of H.sub.3 PO.sub.3 and H.sub.3 PO.sub.4 is so controlled that an atomic ratio of P to V of 1.0 to 1.2 is attained and wherein said H.sub.3 PO.sub.3 is used in such sub-stoichiometric amounts that it is sufficient to reduce the vanadium to an oxidation state only of 4.2 to 4.4, and then said reducing agent combination is used to further reduce the vanadium to an oxidation state between 3.9 to 4.0, any water if present being distilled off as an azeotrope with the alcohol by heating; (b) adding titanium dioxide obtained through high temperature pyrolysis of titanium tetrahalide and optional additional promoters Ni, Fe, Li, Mg; (c) forming precipitated catalyst in a known manner; and (d) activating the catalyst in an oxidation reactor at temperatures of about 450.degree. to 510.degree. C. for about 12 to 72 hours in the presence of an air-hydrocarbon stream.
    • 公开了一种制备用于将饱和或不饱和烃气相氧化成马来酸酐的催化剂的方法,其包括:(a)将含有五价钒的钒化合物与醇中的正磷酸从具有2-8C的一系列一元低级脂族醇混合 原子在可选的助催化剂存在下进行,以及H 3 PO 3 +醇的还原剂组合,其中H 3 PO 3和H 3 PO 4的总和被控制以使得P与V的原子比为1.0至1.2,并且其中所述H 3 PO 3用于 亚化学计量的量,足以将钒还原成氧化态仅为4.2至4.4,然后所述还原剂组合用于进一步将钒还原为3.9至4.0之间的氧化态,任何水(如果存在)蒸馏 通过加热与酒精共沸; (b)加入通过四卤化钛的高温热解获得的二氧化钛和任选的另外的助催化剂Ni,Fe,Li,Mg; (c)以已知方式形成沉淀的催化剂; 和(d)在空气 - 烃流的存在下,在约450℃至510℃的温度下在氧化反应器中活化催化剂约12至72小时。