FIELD: chemistry.
SUBSTANCE: invention relates to versions of a method for controlled oxidation of ethylene to form ethylene oxide, wherein ethylene and oxygen are used along with a silver-based catalyst, a retardant and a co-retardant. When controlling oxidation of ethylene, in order to optimise catalyst properties such as activity and/or selectivity, concentration of the retardant is kept constant within a relatively narrow operating concentration range, and concentration of the co-retardant is varied within a relatively wide operating concentration range. Concentration of the retardant is reduced during the service life of the catalyst.
EFFECT: maintaining efficiency of a silver-based catalyst during oxidation of ethylene as it ages.
16 cl, 3 tbl, 6 ex
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