A METHOD FOR THE (CO)POLYMERIZATION OF ETHYLENE WITH ALPHA-OLEFIN USING A CATALYTIC SYSTEM CONTAINING CHROMIUM AND ALUMINUM

EA054643B1Active Publication Date: 2026-09-22PUBLIC JOINT STOCK COMPANY SIBUR HOLDING
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Patent Information

Application Number
EA202590163
Authority / Receiving Office
EA · EA
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2026-09-22
Estimated Expiration
2044-12-27

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Abstract

A catalytic system for the (co)polymerization of ethylene with alpha-olefins is proposed, containing chromium and aluminum and supported on an inorganic carrier, characterized in that the molar ratio of aluminum to chromium in the catalytic system is from 0.99 to 31.2; the inorganic carrier has an average pore diameter of at least 150 Å; the average particle size of the inorganic carrier is from 50 to 100 μm. Also proposed are a method for producing said catalytic system, a method for (co)polymerizing ethylene with an alpha-olefin using it, as well as a copolymer of ethylene with an alpha-olefin obtained by said method.
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Claims

1. A method for (co)polymerizing ethylene with an alpha-olefin, comprising bringing ethylene and an alpha-olefin into contact with a catalytic system containing chromium and aluminum and supported on an inorganic carrier in the form of silica gel, where the molar ratio of aluminum to chromium in the catalytic system is from 0.99 to 31.2, and the chromium content is in the range from 0.25 to 1.5 wt.%; the inorganic carrier has an average pore diameter of 150 to 500 Å and a specific surface area of ​​300 to 700 m2 / g; the average particle size of the inorganic carrier is from 70 to 80 µm; The particle size distribution of the inorganic carrier is characterized by a SPAN value of less than 1.

5.

2. The method according to claim 1, wherein the inorganic carrier has a pore volume of 2.0 to 5.0 cm3 / g.

3. The method according to claim 1 or 2, wherein the inorganic carrier has an average pore diameter of 150 to 400 Å.

4. The method according to any one of claims 1 to 3, wherein the aluminum content in the catalytic system is in the range from 0.01 to 5.0 wt.%, preferably from 0.25 to 4.5 wt.%, more preferably from 0.5 to 4.0 wt.%.

5. The method according to any one of claims 1 to 4, wherein the reaction temperature is maintained at no higher than 110°C.

6. The method according to any one of paragraphs 1-5, wherein the reaction pressure is maintained at no more than 2.7 MPa.

7. The method according to any one of claims 1 to 6, wherein bringing ethylene and alpha-olefin into contact with the catalytic system is carried out in the gas phase under fluidization conditions.

8. The method according to any one of claims 1 to 7, wherein the alpha-olefin is a C2-C8 alpha-olefin, preferably butene-1 or hexene-1.