A process and systems for the epoxidation of an ethylene with oxygen comprising a two phase temperature profile

Abstract From the Canadian patent

A process for the epoxidation of an olefin which process comprises reacting a , feed comprising the olefin oxygen and a reaction modifier in the presence of a highly selective silver-based catalyst at a reaction temperature T and with , the reaction modifier being present in a relative quantity Q which is the ratio of an effective molar quantity of active species of the reaction modifier present in the feed to an effective molar quantity of hydrocarbons present in the feed, and which process comprises the steps of: operating at a first operating phase wherein the value of T is T1 and the value of Q is Q1 and subsequently operating at a second operating phase at a reaction temperature …