METHOD AND SYSTEM DESIGNED FOR OLEFIN POLYMERIZATION Russian patent published in 2023 - IPC C08F210/02 C08F210/04 

FIELD: olefins.

SUBSTANCE: present invention relates to a process for polymerizing an olefin, comprising the following steps: S1) compressing and condensing the circulating gas stream containing the olefin and the condensing agent discharged from the outlet of the second reactor to obtain a mixture of gas and liquid; separating the mixture of gas and liquid into gas and liquid to produce a gaseous material and a liquid material, wherein the liquid material comprises a first liquid material and a second liquid material having the same or different compositions; S2) feeding the gaseous material and the first liquid material back into the second reactor for circulation, introducing the second liquid material into the first reactor, simultaneously feeding ethylene and catalyst into the first reactor, wherein the catalyst is a two-component supported catalyst that is a mixture of a metallocene catalyst or a catalyst based on a late transition metal and a Ziegler-Natta catalyst, and polymerizing the olefin by reacting it with the catalyst in a first reactor to obtain a mixture containing the first polyolefin; S3) removing the mixture containing the first polyolefin from the first reactor and separating the mixture into at least a first mixture and a second mixture having the same or different compositions; after the heat exchange, feeding the first mixture back into the first reactor and pumping the second mixture into the second reactor; and S4) conducting a polymerization reaction of olefins in a second mixture of a gaseous material and a first liquid material in a second reactor in which the olefins are reacted with a catalyst to produce a second polyolefin, thereby producing a polymerization reaction product comprising the first polyolefin and second polyolefin. A system for carrying out the above method is also described, including: a first reactor and a second olefin polymerization reactor, wherein a compressor, a first heat exchanger and a gas-liquid separator are located in series between an outlet located at the top of the second reactor and a first top inlet of the first reactor ; a liquid outlet located in the gas-liquid separator is connected to the first upper inlet of the first reactor via a fluid conduit; a gas outlet located in the gas-liquid separator is connected to a lower inlet of the second reactor via a fluid conduit; the first upper outlet of the first reactor is respectively connected to the middle inlet of the second reactor and to the second upper inlet of the first reactor.

EFFECT: production of polyolefins with a wide molecular weight distribution, a wide distribution of degrees of branching, good compatibility and good performance characteristics.

15 cl, 5 dwg, 2 tbl, 3 ex