DEVICE AND METHOD FOR GAS-PHASE POLYMERIZATION Russian patent published in 2022 - IPC B01J8/00 B01J19/24 C08F2/01 C08F2/34 

FIELD: gas-phase polymerization.

SUBSTANCE: invention relates to a device for performing gas-phase polymerization of olefins. The device for performing gas-phase polymerization of olefins contains: the first polymerization zone, adapted and located for the upward flow of growing polymer particles under conditions of rapid fluidization or transfer, containing a cylindrical part having a diameter D01, the second polymerization zone, adapted and located for the downward flow of growing polymer particles, containing a cylindrical upper part having a diameter D05 and a cylindrical lower part having a diameter D06, a gas/solid separation zone of a cylindrical shape having a diameter D04, adapted and located to separate the growing polymer particles from the gas stream, which is located at the top of the upper part of the second zone polymerization and is directly attached to the top of the second polymerization zone, a tubular first connector having a diameter D03 adapted and positioned to connect the cylindrical portion of the first polymerization zone to the gas/solid separation zone, a tubular gas circulation line having a diameter D08 adapted and positioned to connect the gas/solid separation zone to the first zone polymerization, a tubular transitional part having a diameter D02 located between the gas circulation line and the cylindrical part of the first polymerization zone, and a tubular second connecting element having a diameter D09, adapted and located for connecting the lower part of the second polymerization zone to the transitional part, where the gas circulation line equipped with a compressor adapted and located for circulating gas in the gas circulating line, and a heat exchanger adapted and located for removing heat from the gas flowing in the gas circulating line, where the ratio D04 to D05 is from 1.0 to 1.5, and the ratio D05 to D06 amounting from 1.2 to 2, where the first connecting element is a bend having a radius R03, or is a tubular element containing one or more curved parts having one or more radii R03, and one or more linear parts, and the ratio of R03 to D03 is from 1 to 6, and the ratio of D03 to D01 is 0.3 to 0.85. Wherein the first connecting element contains a connecting section, wherein the first connecting element and the gas/solid separation zone are connected by means of a connecting section, and the connection of the connecting section to the gas/solid separation zone is tangential and has such an inclination that the central axis of the connecting section and horizontal form an angle A16, and the angle A16 is in the range from 0° to 40°. The transition part is a bend or is a tubular element containing one or more curved parts and one or more linear parts, and the ratio of D08 to D02 is from 1.0 to 2.2. The second connecting element is a bend or is a tubular element containing one or more curved parts and one or more linear parts. Described is a method for performing gas-phase polymerization of olefins in a device at temperatures from 20°C to 200°C and pressures from 0.5 MPa to 10 MPa in the presence of a polymerization catalyst.

EFFECT: providing effective separation in the gas/solid separation zone installed at the top of the second polymerization zone, with reduced friction between the polymer particles and between the polymer particles and the walls of the device, obtaining a low pressure drop in the connecting elements connecting the first polymerization zone, the second polymerization zone and the line gas circulation, and the intersections between the connecting elements and the first polymerization zone, the second polymerization zone or the gas circulation line, and achieving good immersion and homogenization of polymer particles leaving the second polymerization zone in the gas stream coming from the gas circulation line, and rapid fluidization or transfer of polymer particles in the first polymerization zone.

15 cl, 7 dwg, 1 ex