PROCESS FOR ACTIVATION OF TITANIUM AND VANADIUM CATALYSTS USEFUL IN ETHYLENE POLYMERIZATION

摘要

PROCESS FOR ACTIVATION OF TITANIUM AND VANADIUM CATALYSTS USEFUL IN ETHYLENE POLYMERIZATION A process for activating a titanium or vanadium compound and producing polyethylene comprising (i) dissolving a divalent magnesium halide and a Lewis acid having the formula RmA1Xn or RmBXn 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 the group consisting of alkyl esters of alkyl and aromatic carboxylic acids and alkyl and cycloalkyl ethers, each compound having 2 to 12 carbon atoms, in such a manner that 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.