Patent ID: 9738735
Date: 2017-08-22
CPC Classifications: B01F,B01J,C08F

Claim:
1. A process for the preparation of polyethylene by polymerizing in a slurry ethylene and optionally one or more C 3 to C 10 alpha-olefins at a temperature from 60-95° C. and a pressure from 0.15-3 MPa; wherein the polymerization is carried out in a cylindrical polymerization reactor having a cylindrical reactor wall, a bottom reactor head and a top reactor head and the reactor has an inner diameter D and is equipped with an agitator for mixing the contents of the reactor and inducing a flow of the slurry; wherein the ethylene is fed into the reactor by an ethylene injection system comprising one or more injection nozzles which project through the bottom reactor head or through the reactor wall and extend from 0.02-0.5 times the inner diameter D into the reactor and wherein the ethylene exits the injection nozzle with an exit velocity from 10-200 m/s.