A METHOD FOR HOMO- OR COPOLYMERIZING ETHENE

摘要

The invention relates to a method for homo- or copolymerizing ethene in the presence of a Ziegler-Natta catalyst and a possible comonomer and hydrogen for preparing a homo- or copolymer of ethene present in a particle form in propane. In accordance with the invention, the polymerization is performed in a loop reactor in such conditions, where the temperature is higher than the critical temperature of a mixture formed by ethene, propane and a possible hydrogen and a comonomer, but lower than the melting temperature of the ethene polymer forming in the polymerization, and the pressure is higher than the critical pressure of said mixture.