GAS-PHASE POLYMERISATION OF ALPHA-OLEFIN Russian patent published in 2013 - IPC C08F2/34 C08F10/00 C08F210/16 B01J19/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for gas-phase polymerisation of alpha-olefin and an internal circulation fluidised-bed polymerisation reactor for realising said method. The method for gas-phase polymerisation of alpha-olefin involves cycled gas containing one or more alpha-olefins and an inert gas into a polymerisation reactor; polymerising the alpha-olefin to polyolefin in the presence of a catalyst in two separate polymerisation zones in the polymerisation reactor; and removing the obtained polyolefin from the polymerisation reactor. The internal circulation fluidised-bed polymerisation reactor has one outlet pipe which is mounted in the reactor, in which at least one through-hole is formed, said through-hole connecting the inner and outer parts of the outlet pipe, and a gas-distributing plate which is mounted with inclination from the outer part of the outlet pipe to the side wall of the polymerisation reactor. The polymerisation reactor is divided into two polymerisation zones by the outlet pipe and the inner part of the outlet pipe forms a riser in which polyolefins rise during fast fluidisation. The outer part of the outlet pipe forms an annular gap in which polyolefins passing through the riser descent under gravity. Polyolefins passing through the annular gap are again fed into the bottom part of the riser and are polymerised during circulation between the riser and the annular gap. The alpha-olefin is a compound of formula CH₂=CHR, where R is a hydrogen atom or a hydrocarbon radical with 1-12 carbon atoms.

EFFECT: highly efficient method and reactor for gas-phase polymerisation of alpha-olefin.

19 cl, 5 tbl, 5 dwg, 17 ex