Controlling of process for the continuous free-radical polymerization of ethylene in the presence or absence of comonomers, uses the calculated amount and composition of at least two polymerization initiators as basis for metered addition

摘要

A process for the continuous free-radical polymerization of ethylene is controlled in the presence or absence of comonomers in a tube reactor having at least one reaction zone (1-4) at above 1000 bar and 100-400[deg]C, by using the calculated amount and composition of at least two polymerization initiators as basis for metered addition. Controlling of a process for the continuous free-radical polymerization of ethylene in the presence or absence of comonomers in a tube reactor having at least one reaction zone (1-4) at above 1000 bar and 100-400[deg]C, comprises metering continuously a mixture of at least two polymerization initiators which have different reaction characteristics and provision costs into the tube reactor at the beginning of the reaction zone (1-4). At least one physical parameter which has an influence on the polymerization initiator mixture to be used is measured in the reaction zone (1-4). The mixture of polymerization initiators which under the prevailing conditions of the physical parameter(s) measured results in the minimum initiator costs for producing a prescribed amount of polymer product having prescribed product properties and ensures safe operation of the tube reactor is calculated for the reaction zone (1-4). The calculated amount and composition of the polymerization initiators is used as the basis for the further metered addition.