Process for preparing spherical polymerization catalyst components for use in olefin polymerizations
View Patent ↗A method of making a solid catalyst component for production of a polyolefin, including the steps of: a) dissolving a halide-containing magnesium compound in a mixture including alkylepoxide, an organic phosphorous compound, a carboxylic acid or anhydride, and a hydrocarbon solvent to form a homogenous solution; b) optionally treating the homogeneous solution with a halogenating agent; c) treating the homogenous solution with a first titanium halide compound in the presence of a surface modifier and optionally a first electron donor to form a solid precipitate, wherein, if present, the first electron donor is an ether; d) optionally treating the solid precipitate with a second electron donor; and e) treating the solid precipitate with a second titanium halide compound and optionally with a second electron donor to form the solid catalyst component.
1. A method of making a solid catalyst component for production of a polyolefin, comprising
a) dissolving a halide-containing magnesium compound in a mixture comprising alkylepoxide, an organic phosphorous compound, a carboxylic acid or anhydride, and a hydrocarbon solvent to form a homogenous solution;
b) optionally treating the homogeneous solution with a halogenating agent;
c) treating the homogenous solution with a first titanium compound in the presence of a surface modifier and a first electron donor that is a di-(C 1 -C 12 ) alkylether to form a solid precipitate;
e) treating the solid precipitate with a second titanium compound and a second electron donor to form the solid catalyst component,
wherein:
step b) is performed and/or the first electron donor is present in step c); and
the first titanium compound and the second titanium compound are each independently represented by:
Ti(OR) g X 4-g ;
each R group independently represents an alkyl group having 1 to 4 carbon atoms;
X represents Br, Cl, or I; and
g is a whole number satisfying the formula 0≦g≦4.
2. The method of claim 1 , wherein step b) is performed.
3. The method of claim 2 , wherein the halogenating agent is an organic or inorganic compound containing at least one halogen atom that can be transferred to a magnesium atom.
4. The method of claim 1 , wherein the hydrocarbon solvent is an aromatic solvent, non-aromatic solvent, or a mixture comprising an aromatic solvent and a non-aromatic solvent.
5. The method of claim 4 , wherein the aromatic solvent comprises toluene or C 2 -C 20 alkylbenzene and the non-aromatic solvent comprises hexane or heptane.
6. The method of claim 1 , wherein said step c) comprises:
c1) mixing the homogenous solution with the first titanium compound in the presence of the surface modifier and the a di-(C 1 -C 12 )alkylether; and
c2) heating the mixture from step c1) to a temperature from 80° C. to 150° C. to obtain the solid precipitate.
7. The method of claim 1 , wherein the surface modifier is an acrylate-based additive.
8. The method of claim 1 , wherein the halide-containing magnesium compound is selected from the group consisting of magnesium chloride, magnesium bromide, magnesium iodide, and magnesium fluoride.
9. The method of claim 1 , wherein the organic phosphorous compound is represented by a structure:
wherein R 1 , R 2 , and R 3 are each independently selected from the group consisting of methyl, ethyl, and linear or branched (C 3 -C 10 )alkyl groups.
10. The method of claim 1 , wherein the alkylepoxide is represented by
where “a” is from 1 to 5 and X is F, Cl, Br, I, or methyl.
11. The method of claim 1 , wherein the carboxylic acid or anhydride is at least one member selected from the group consisting of acetic anhydride, phthalic anhydride, succinic anhydride, maleic anhydride, pyromellitic dianhydride, acetic acid, propionic acid, butyric acid, acrylic acid, and methacrylic acid.
12. The method of claim 1 , wherein the second electron donor is at least one selected from the group consisting of carboxylic acid esters, ethers, and ketones.
13. The solid catalyst component produced by the method of claim 1 .
14. A catalyst system for use in olefinic polymerization, comprising:
(i) said solid catalyst component of claim 13 ;
(ii) an organoaluminum compound; and
(iii) optionally an organosilicon compound.
15. A process for polymerizing or copolymerizing an olefin monomer, comprising the steps of:
(i) providing the catalyst system according to claim 14 ;
(ii) polymerizing or copolymerizing the olefin monomer in the presence of the catalyst system to form a polymer or a copolymer; and
(iii) recovering the polymer or copolymer.
16. The method of claim 1 , wherein the di-(C 1 -C 12 )alkylether is selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, di-n-butyl ether, butyl propyl ether, diamyl ether, diisoamyl ether, and dihexyl ether.