METHOD AND DEVICE FOR ETHYLENE POLYMERISATION Russian patent published in 2008 - IPC C08F10/02 C08F2/34 C08F4/64 C08F4/6592 C08F4/654 B01J8/18 

FIELD: chemistry.

SUBSTANCE: invention relates to method of gas-phase polymerisation of production high density ethylene. Described is method of production of polyethylene with wide molecule-weight distribution by ethylene polymerisation in presence of polymerisation catalyst, method includes following stages in any general order: a) polyethylene polymerisation, optionally, with one or more α-olefine comonomers, having from 3 to 12 carbon atoms, in gas-phase reactor in presence of hydrogen; b) ethylene copolymerisation with one or more α-olefine comonomers, having from 3 to 12 carbon atoms, in other gas-phase reactor in presence of hydrogen amount less than at stage a), where, at least, in one said gas-phase reactors growing polymer particles flow upward through first polymerisation zone in conditions of fast pseudoliquefying or transportation, leave said first polymerisation zone and enter second polymerisation zone, through which they flow downward under impact of gravity.

EFFECT: production of polyethylene with improved mechanical properties and improved resistance to cracking under stress.

21 cl, 5 tbl, 2 dwg, 7 ex