C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
252/85, 260/372.
C07D 301/10 (2006.01) B01J 23/50 (2006.01) B01J 23/66 (2006.01) C07D 303/04 (2006.01)
Patent
CA 1250277
TITLE PROCESS FOR PREPARING SILVER CATALYSTS INVENTOR WILLIAM D. ARMSTRONG ABSTRACT A supported silver catalyst for the oxidation of ethylene to ethylene oxide with molecular oxygen is made by impregnating a support with a hydrocarbon solu- tion of a silver salt of a neo-acid having 7 or more carbon atoms, substantially free of water and said neo- acid. Preferably, the hydrocarbon solvent is toluene, xylene, ethyl benzene, cyclohexane, or cumene. The impregnated support is dried and the silver is activated under conditions chosen to provide the optimum selecti- vity to ethylene oxide. Thereafter, the activated silver catalyst maybe impregnated with an alkali metal solution sufficient to increase selectivity of the silver catalyst above its alkali-free state. The amount of alkali metal on the finished catalyst is the optimum for the par- ticular support selected and preferably will be about 1 - 6x10-3 gew/kg of catalyst. The catalyst may also include additional promoters, such as the alkaline earth metals, preferably barium.
480269
Gowling Lafleur Henderson Llp
Scientific Design Company Inc.
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