| 摘要 |
<p>1,211,096. Vinyl acetate. FARBENFABRIKEN BAYER A.G. and FARBWERKE HOECHST A.G. 13 Nov., 1967 [12 Nov., 1966; 27 Dec., 1966; 2 March, 1967], No. 51544/67. Heading C2C. Vinyl acetate is prepared by reacting ethylene with acetic acid and oxygen in the gaseous phase at an elevated temperature in the presence of a catalyst containing palladium metal and one or more alkali metal salts, e.g. acetates or compounds which can form alkali metal acetates under the reaction conditions. The process is continuous and a small quantity of one or more alkali metal salts is added continuously or intermittently to one or more of the reactants so that the composition of the palladium carrier catalyst (i.e. noble metal, alkali metal acetate and carrier) is kept constant and optimal. The addition of the alkali metal compound preferably in the form of a solution, to the reactant or reactants may be accomplished by passing the latter partly or entirely in the gaseous form through a solution of alkali metal compound or through layers of solid bodies impregnated with alkali metal compounds.</p> |
