Process for producing polyethylene having constant physical and chemical properties.

摘要

A process for producing polymers or copolymers of ethylene, in which ethylene, optionally together with one or more copolymerizable compounds, is polymerized at a pressure above 50,000 kPa and a temperature of between 100 DEG and 400 DEG C in the presence of an initiator, and using an autoclave reactor and a tubular reactor connected in series with said autoclave reactor, whereby passing the monomeric mixture in the presence of the initiator first into a stirred autoclave, in which it is partially polymerized, and thereafter discharging the reaction mixture from said autoclave, and passing it through a heat exchanger, in which it is cooled to a pre-determined value, and subsequently passing the reaction mixture to a non-cooled tubular reactor, in which the further polymerisation is carried out under adiabatic conditions.