High pressure, free radical polymerizations to produce ethylene-based polymers

Abstract

A process to form an ethylene-based polymer in a reactor system, said process comprising at least the following steps: a) injecting a first initiator mixture into the tubular reactor at location L along the reactor, b) injecting a compressed make-up CTA system at the location L, at a distance (L−L) from 145*Dto 1000*D, upstream from L, and wherein D=the inner diameter of the pre-heater in meter (m); and wherein Lis located in the preheater, and c) optionally, injecting one or more additional compressed make-up CTA system(s) into the preheater, at one or more location: LL, L(2≤i and 2≤n), upstream from L, and each location is, independently, at a distance from 145*Dto 1000*D, and wherein n equals the total number of injection locations of the make-up CTA system(s) injected into the preheater, upstream from L, and wherein (L−L) is less than each (L−L), (L−L), (L−L); and d) polymerizing a reaction mixture comprising at least ethylene, the first initiator mixture, and the compressed make-up CTA system of step b), and wherein the process has a log coefficient of variation (log(CoV)), at L, that meets the relationships described herein.