Abstract: 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 which is different from the reaction temperature employed in the first operating phase, such that the value of T is T2 and the value of Q is substantially Q2, whereby Q2 is determined by calculation and Q2 is defined by the formula Q2=Q1+B(T2?T1), wherein B denotes a constant factor which is greater than 0; a reaction system

Abstract: A reaction system for epoxidation of olefins, with a feed control system configured to control the relative quantity of reaction modifier present in the feed, where the relative quantity of said reaction modifier is changed in response to changes in the reaction temperature.

Abstract: 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 which is different from the reaction temperature employed in the first operating phase, such that the value of T is T2 and the value of Q is substantially Q2, whereby Q2 is determined by calculation and Q2 is defined by the formula Q2=Q1+B(T2?T1), wherein B denotes a constant factor which is greater than 0; a reaction syste

Abstract: 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 which is different from the reaction temperature employed in the first operating phase, such that the value of T is T2 and the value of Q is substantially Q2, whereby Q2 is determined by calculation and Q2 is defined by the formula Q2=Q1+B(T2?T1), wherein B denotes a constant factor which is greater than 0; a reaction syste

Abstract: 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 which is different from the reaction temperature employed in the first operating phase, such that the value of T is T2 and the value of Q is substantially Q2, whereby Q2 is determined by calculation and Q2 is defined by the formula Q2=Q1+B(T2?T1), wherein B denotes a constant factor which is greater than 0; a reaction system

Abstract: A method for the start-up of a process for the epoxidation of an olefin, which method comprises contacting a catalyst bed comprising a silver-based highly selective epoxidation catalyst, or a precursor of the catalyst comprising the silver in cationic form, with a feed comprising oxygen at a temperature of the catalyst bed above 260° C. for a period of at most 150 hours, and subsequently decreasing the temperature of the catalyst bed to a value of at most 260° C., and a process for the epoxidation of an olefin, which process, comprises contacting a catalyst bed comprising a silver-based highly selective epoxidation catalyst, or a precursor of the catalyst comprising the silver in cationic form, with a feed comprising oxygen at a temperature of the catalyst bed above 260° C. for a period of at most 150 hours, and subsequently decreasing the-temperature of the catalyst bed to a value of at most 260° C. and contacting the catalyst with the feed comprising the olefin and oxygen.

Abstract: A method for the start-up of a process for the epoxidation of an olefin, which method comprises

Abstract: 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: