METHOD FOR GAS-PHASE POLYMERISATION OF ALPHA-OLEFINS IN FLUIDIZED BED IN REACTOR SYSTEM Russian patent published in 2024 - IPC C08F2/01 C08F2/34 B01J8/26 C08F210/16 

FIELD: chemistry.

SUBSTANCE: invention is intended for the production of polyethylene and polyethylene copolymers, characterized by a wide molecular weight distribution, and can be used in the field of petrochemical processes, in particular in the polymerization of alpha-olefins. Disclosed is a method for gas-phase polymerisation of alpha-olefins in a fluidised bed in a reactor system, comprising that the system includes a main sectional reactor with fluidised catalyst beds, one or more auxiliary reactors with fluidised catalyst beds and a gas mixture circulation circuit, auxiliary reactors are connected to the main reactor by two catalyst overflow pipes so that the first branch pipe is connected to the lower part of one of the main reactor sections and the upper part of the auxiliary reactor, the second branch pipe is connected to the lower part of the auxiliary reactor and the upper part of the lower section of the main reactor, wherein the circulating gas is removed from the top of the reactors, mixing, if necessary, with fresh alpha-olefin, hydrogen, nitrogen, and supplied to the compressor suction line, after compression, the circulating gas is cooled, mixed, the catalyst and additives are fed into each section of the main reactor and auxiliary reactors, the induced condenser is fed into a layer of granular inoculating material into all sections of the main reactor and in section of auxiliary reactors; finished polymer is discharged through finished polymer discharge unions installed in the lower part of cylindrical housings of the main and auxiliary reactors.

EFFECT: development of a flexible reactor system for gas-phase polymerisation of alpha-olefins in a fluidized bed, which enables to produce various grades of polymer, change molecular weight distribution of polymers and productivity, while maintaining quality of products, and reduce power consumption for implementation of the process.

15 cl, 1 dwg, 1 ex