Process of production of large and spherical polymerization catalyst and use of same in olefin polymerizations

摘要

Solid catalyst particles for use in olefin polymerization, olefin polymerization catalyst systems containing the solid catalyst particles, methods of making the solid catalyst particles and the catalyst systems, and methods of polymerizing and copolymerizing olefins involving the use of the catalyst systems. The method of preparing the solid catalyst particles includes steps of maintaining a mixture of reactants at a temperature of about 5° C. to about 35° C. for at least 2 hours; increasing the temperature of said mixture to a temperature of about 40° C. to about 50° C. over a period of at least 3 hours; and increasing the temperature of said mixture to a temperature of about 80° C. to about 90° C.

主权项

1. A process for preparing a catalyst system used in olefinic polymerization, said process comprising the following steps:
(a) dissolving a magnesium compound, an organic oxygenate and an organic compound containing a group V element in at least one organic solvent to form a solution, the at least one organic solvent comprising toluene or ethyl benzene; (b) dissolving an auxiliary precipitant in said solution; (c) contacting a titanium compound with said solution to form a first mixture containing the magnesium compound and the titanium compound; (d) maintaining said first mixture at a temperature of about 5° C. to about 35° C. for at least 2 hours; (e) increasing the temperature of said first mixture to a temperature of about 40° C. to about 50° C. over a period of at least 3 hours; (f) increasing the temperature of said first mixture to a temperature of about 80° C. to about 90° C.; (g) collecting flocculated solids from the first mixture; (h) washing said flocculated solids from the first mixture with a second mixture of said titanium compound and at least one aromatic organic solvent to form washed flocculated solids from the first mixture; and (i) treating said washed flocculated solids from the first mixture with a third mixture of said titanium compound and at least one aromatic organic solvent to produce substantially spherical catalyst particles having a diameter of from about 20 microns to about 45 microns (on a 50% by volume basis).