초록 ▼

In an industrial process for the heterogeneously catalyzed gas-phase oxidation of propane with molecular oxygen to give acrolein, the feed gas mixture having an initial undiluted molar ratio of the reactants propane:O.sub.2 of 7:3 is diluted with the reactant propane and, if desired, inert gases in

In an industrial process for the heterogeneously catalyzed gas-phase oxidation of propane with molecular oxygen to give acrolein, the feed gas mixture having an initial undiluted molar ratio of the reactants propane:O.sub.2 of 7:3 is diluted with the reactant propane and, if desired, inert gases in such a way that the feed gas mixture comprises more than 70% by volume of propane and at least 5% by volume of O.sub.2.

대표청구항 ▼

[ We claim:] [1.]1. A process for the industrial heterogeneously catalyzed gasphase oxidation of propane to acrolein, comprising:feeding a gas mixture comprising propane molecular oxygen as oxidant, and at most one inert diluent gas to an oxidation reactor containing a catalyst;wherein said gas mixt

[ We claim:] [1.]1. A process for the industrial heterogeneously catalyzed gasphase oxidation of propane to acrolein, comprising:feeding a gas mixture comprising propane molecular oxygen as oxidant, and at most one inert diluent gas to an oxidation reactor containing a catalyst;wherein said gas mixture comprises more than 70% by volume of propane and at least 5% by volume of molecular oxygen per 100% by volume of said gas mixture,wherein said catalyst is a multimetal oxide composition of formula (I)X.sup.1 =V, Nb, Ta, Cr, W, Ga, Ce and/or La,X.sup.2 =Li, Na, K, Rb, CS, Cu, Ag, Au, Pd and/or Pt,X.sup.3 =Sn, Pb, Sb, Bi, Te, Fe, Co and/or Ni,X.sup.4 =Si, Al, Ti and/or Zr,a=0-2,d=0-2, with the proviso that the sum of a and d is at least 0.20;b=0-1.5,c=0-10, with the proviso that the sum of b and c is at least 0.1;e=0-0.5,f=0-0.5,g=0-20andh=a number different from zero which is determined by the valence and frequency of the elements different from oxygen in (I);wherein said catalyst is an unsupported catalyst having a geometry of a hollow cylinder;wherein an external diameter and a length of said hollow cylinder are from 2 to 10 mm; andwherein a wall thickness of said hollow cylinder is from 1 to 3 mm.