Patent ID: 7566676

Claim:
A preparation method for a solid titanium catalyst for olefin polymerization, which comprises the steps of: (1) preparing a magnesium compound solution by dissolving a magnesium halide compound into a mixed solvent of a cyclic ether and one or more of alcohol; (2) preparing a carrier by adding firstly a titanium halide compound having a general formula of Ti(OR) a X (4−a) , in which R is an (4−a) alkyl group having 1-10 carbon atoms, X is a halogen atom and a is an integer of 0-3, to the magnesium compound solution at −10-30° C., wherein the molar ratio of the firstly-added titanium halide compound to the mixed solvent of cyclic ether and one or more of alcohol is 1:3.0-1:10, elevating the temperature of the resulted solution or aging it, and then thereto adding secondly the titanium halide compound additionally; (3) preparing a titanium catalyst by reacting the carrier with a titanium compound and an electron donor; and (4) washing the titanium catalyst with hydrocarbon solvent at 40-200° C.