METHOD FOR GAS-PHASE POLYMERISATION OF OLEFINS Russian patent published in 2011 - IPC C08F210/06 C08F10/00 C08F2/00 C08F2/34 B01J8/18 B01J19/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for gas-phase polymerisation of olefins, where polymerisation takes place in a reactor having interconnected polymerisation zones. The method for gas-phase polymerisation of α-olefins CH₂=CHR, where R denotes hydrogen or a hydrocarbon radical, having 1-12 carbon atoms, is realised in first and second interconnected polymerisation zones. One or more α-olefins are fed in the presence of a catalyst. Growing polymer particles pass through the first of the said zones (a pipe going upwards) under fast fluidisation conditions, comes from the said pipe and enter the second of the said polymerisation zones (pipe going downwards), through which the go down in dense form, come out of the pipe going downwards and once again enter the said pipe going upwards. The gas mixture inside the pipe going upwards is completely or partially prevented from entering the pipe going downwards. The gaseous composition inside part of the pipe going downwards is kept essentially similar to the gaseous composition in the pipe going upwards.

EFFECT: wide range of polymer compositions, obtained using a polymerisation reactor, having interconnected polymerisation zones.

7 cl, 1 dwg, 3 tbl, 3 ex