MULTI-STEP METHOD FOR POLYMERISATION OF OLEFINS Russian patent published in 2013 - IPC C08F2/01 C08F2/18 C08F2/34 C08F10/00 B01J8/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a multi-step method for polymerisation of olefins. Described is polymerisation of olefins in a sequence from a suspension reactor lying upstream and a gas-phase reactor lying downstream. Polymer is fed from the reactor lying upstream into the reactor lying downstream through the following steps: a) heating the suspension of polyolefin particles in order to evaporate the liquid polymerisation medium; b) separating polyolefin particles from the obtained gas phase in at least one separation chamber; c) feeding polyolefin particles into said reactor lying downstream through a pair of lock hoppers. A polymerisation apparatus is also described.

EFFECT: continuous feeding of polymer from the suspension polymerisation reactor lying upstream into the reactor lying downstream without any undesirable change in composition of the gas in the reactor lying downstream.

19 cl, 1 dwg, 2 tbl, 2 ex