Impact of Thermo‐Physical Data on the Modeling of High‐Pressure Polymerizations

Abstract

Modeling the high-pressure polymerization of ethene is of vital importance in order to avoid costly high-pressure experiments when it comes to process optimization and product design. However, closing the heat balance when modeling highpressure tubular reactors with a counter-current jacket cooling is still difficult. In this contribution the influence of thermo-physical properties -namely viscosity and heat capacity -on the simulation results was investigated. Various literature sources were evaluated and a variety of simulations were conducted, showing that both properties influence the resulting temperature profiles and conversions visibly, while the molecular weight distribution was not affected. Uncertainties of the heat capacity of 5 % could be compensated by varying initiator efficiency and fouling layer thickness within physically reasonable boundaries.