US 2026/0275004 A1 · SPHERICAL CATALYST FOR OLEFIN POLYMERIZATION

Abstract

The present invention provides a spherical catalyst for olefin polymerization. In the present invention, first, a magnesium compound is reacted with an alcohol mixture in the presence of polyvinylpyrrolidone and a multi-polar functional group compound, to produce a complex solution; the complex solution reacts with an alkylene oxide compound to produce a solid adduct; the solid adduct is washed to obtain a spherical carrier; the spherical carrier reacts with a titanium compound to obtain an intermediate product; the intermediate product reacts with titanium tetrachloride to obtain the spherical catalyst. The preparation process for the catalyst provided by the present invention is simple and feasible, and produces a spherical catalyst having well-defined morphology and controllable size. When used for olefin polymerization, particularly ethylene polymerization, the catalyst exhibits high activity, good hydrogen regulation sensitivity, and a relatively high 1-hexene insertion rate. In addition, polymer particles obtained using the catalyst have low fine powder content.

Claims15

Dependent claims

A spherical carrier for olefin polymerization, wherein the carrier is prepared with the following steps:

(1) reacting a magnesium compound with an organic compound containing active hydrogen in the presence of polyvinylpyrrolidone and a multi-polar functional group compound at a temperature of 30-160° C. to form a complex solution;
(2) reacting the complex solution with an epoxy compound to precipitate a solid compound;
the epoxy compound is represented by formula (I):
in formula (I), R2 and R3 are each independently selected from hydrogen, C1-C5 straight or branched chain alkyl, wherein the hydrogen on the alkyl is optionally substituted by a halogen atom X;
(3) washing the solid compound obtained in step (2) with an inert alkane solvent to obtain a magnesium compound spherical carrier;
wherein the multi-polar functional group compound in step (1) refers to a compound having a multi-polar functional group represented by the general formula CnH2nOn, where n is 4 to 8;
the organic compound containing active hydrogen in step (1) refers to one or more compound represented by formula R(OH)m or a mixture thereof, wherein R is C1-C20 hydrocarbyl, and m≥1;
the inert alkane solvent in step (3) refers to a compound represented by formula CnH2n+2 or a mixture thereof, wherein n≥5.

5 more elements

Dependencies are inferred from the claim text.

Spherical catalyst for olefin polymerization

Life of this patent

Spherical catalyst for olefin polymerization

Life of this patent

Abstract

Claims15