Process for activation of titanium and vanadium catalysts useful in ethylene polymerization.

摘要

A process for activating a titanium or vanadium com. pound and producing a polyethylene comprising (i) dissolving a divalent magnesium halide and a Lewis acid having the formula R<Sub>m</Sub>AlX<Sub>n</Sub> or R<Sub>m</Sub>BX<Sub>n</Sub> wherein R is an alkyl or aromatic radical, each radical having 1 to 12 carbon atoms and each R being alike or different; X is a halogen atom; m is an integer from 0 to 3; n is an integer from 0 to 3; and m+n equals 3, in an excess of electron donor compound selected from alkyl esters of alkyl and aromatic carboxylic acids and alkyl and cycloalkyl ethers, each compound having 2 to 12 carbon atoms, in such a mannerthat a magnesium halide/Lewis acid/ electron donor complex is formed; (ii) separating the complex from excess electron donor compound; and (iii) introducing (a) the complex, the titanium or vanadium compound, and a hydrocarbyl aluminum compound and (b) ethylene into a reactor in such a manner that the titanium or vanadium compound is activated and polyethylene is produced.