Ethylene oxide production using fixed moderator concentration
AssigneeSD Lizenzverwertungsgesellschaft mbH & Co. KG
InventorsNabil Rizkalla, Howard Sachs, Mansoor Firoz Husain, Christian J. Gueckel, Andrzej Rokicki
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Abstract
A method for controlling ethylene oxidation uses ethylene and oxygen, in conjunction with a silver based catalyst, a moderator and a co-moderator, to form ethylene oxide. When controlling the ethylene oxidation reaction, the moderator concentration is maintained constant within a comparatively narrow operative concentration range and the co-moderator concentration is varied within a comparatively wider operative concentration range, to optimize a catalyst property such as the catalyst activity and/or the catalyst selectivity.
Claims16
A method for controlling ethylene oxidation comprising:
- reacting a feed gas mixture comprised of ethylene, oxygen, a moderator, and a co-moderator with a silver-based catalyst comprising at least rhenium in a promoting amount to form ethylene oxide;
- and
- holding constant the concentration of the moderator, while progressively reducing the concentration of said co-moderator through the usable life of the silver-based catalyst such that the reaction temperature is maintained through the usable life of the silver-based catalyst.
A method for controlling ethylene oxidation comprising:
- reacting a feed gas mixture comprised of ethylene, oxygen, an organic halide moderator, and an organic non-halide co-moderator with a silver-based catalyst comprising at least rhenium in a promoting amount to form ethylene oxide;
- and
- holding constant the concentration of the organic halide moderator, while progressively reducing the concentration of said non-halide co-moderator through the usable life of the silver-based catalyst such that the reaction temperature is maintained through the usable life of the silver-based catalyst.
Dependencies are inferred from the claim text.