US 12,351,671 B2 · Polyolefin catalyst component containing mesoporous material, preparation method therefor and use thereof

Abstract

The invention relates to the technical field of heterogeneous catalytic olefin polymerization, and discloses a polyolefin catalyst, its preparation and its us. A method for preparing the polyolefin catalyst comprises: (i) providing a thermally activated mesoporous material, with the thermal activation treatment being performed at a temperature of 300 to 900° C. for a period of time of 3 to 48 hours; (ii) under an inert atmosphere, (iia) conducting impregnation treatment of the thermally activated mesoporous material with a solution containing a magnesium component and then with a solution containing a titanium component, (iib) conducting impregnation treatment of the thermally activated mesoporous material with a solution containing a titanium component and then with a solution containing a magnesium component, or (iic) conducting co-impregnation treatment of the thermally activated mesoporous material with a solution containing both a titanium component and a magnesium component, to obtain a slurry to be sprayed; and (iii) spray drying the slurry to be sprayed from step (ii), to obtain a solid polyolefin catalyst component. When used in olefin polymerization, the polyolefin catalysts prepared by using the method provided by the invention have high catalytic activities, and polyolefin products having a narrow molecular weight distribution and an excellent melt index can be obtained.

Claims20

Dependent claims

A thermally activated mesoporous material, wherein the thermally activated mesoporous material is obtained by subjecting a mesoporous material to a thermal activation treatment performed under an inert atmosphere at a temperature of 300 to 900° C. for a period of time of 3 to 48 hours, and then to a chlorine-containing silane treatment and a ball-milling treatment, wherein the chlorine-containing silane treatment and the ball-milling treatment are carried out simultaneously or separately, wherein the mesoporous material is selected from the group consisting of:

a) an eggshell-like mesoporous material with a two-dimensional hexagonal channel structure, having a pore volume of from 0.5 to 1.5 mL/g, a specific surface area of from 100 to 500 m2/g, and an average pore size of from 5 to 15 nm;
b) a spherical mesoporous silica with a body-centered cubic structure, having a specific surface area of from 700 to 900 m2/g, a pore volume of from 0.5 to 1 mL/g, and an average pore size of from 1 to 5 nm;
and
c) a hexagonal mesoporous material with a cubic cage-like channel structure, the crystal structure of which has a body-centered cubic Im3m structure, the hexagonal mesoporous material having an average pore size of from 4 to 15 nm, a specific surface area of from 450 to 550 m2/g, and a pore volume of from 0.5 to 1.5 mL/g.

1 more element

A method for preparing a polyolefin catalyst component, comprising the steps of:

(i) providing a thermally activated mesoporous material by subjecting a mesoporous material to a thermal activation treatment performed under an inert atmosphere at a temperature of 300 to 900° C. for a period of time of 3 to 48 hours to provide an intermediate mesoporous material, and then subjecting the intermediate mesoporous material to a chlorine-containing silane treatment and a ball-milling treatment, wherein the chlorine-containing silane treatment and the ball-milling treatment are carried out simultaneously or separately, wherein the mesoporous material is selected from:
a) an eggshell-like mesoporous material with a two-dimensional hexagonal channel structure, having a pore volume of from 0.5 to 1.5 mL/g, a specific surface area of from 100 to 500 m2/g, and an average pore size of from 5 to 15 nm;
b) a spherical mesoporous silica with a body-centered cubic structure, having a specific surface area of from 700 to 900 m2/g, a pore volume of from 0.5 to 1 mL/g, and an average pore size of from 1 to 5 nm;
and
c) a hexagonal mesoporous material with a cubic cage-like channel structure, the crystal structure of which has a body-centered cubic Im3m structure, the hexagonal mesoporous material having an average pore size of from 4 to 15 nm, a specific surface area of from 450 to 550 m2/g, and a pore volume of from 0.5 to 1.5 mL/g;
(ii) under an inert atmosphere, (iia) conducting impregnation treatment of the thermally activated mesoporous material with a solution containing a magnesium component and then with a solution containing a titanium component, (iib) conducting impregnation treatment of the thermally activated mesoporous material with a solution containing a titanium component and then with a solution containing a magnesium component, or (iic) conducting co-impregnation treatment of the thermally activated mesoporous material with a solution containing both a titanium component and a magnesium component, to obtain a slurry to be sprayed;
and
(iii) spray drying the slurry to be sprayed from step (ii), to obtain a solid polyolefin catalyst component.

5 more elements

Dependencies are inferred from the claim text.

Polyolefin catalyst component containing mesoporous material, preparation method therefor and use thereof

Life of this patent

Polyolefin catalyst component containing mesoporous material, preparation method therefor and use thereof

Life of this patent

Abstract

Claims20