METHOD AND DEVICE FOR ETHYLENE POLYMERISATION Russian patent published in 2010 - IPC C08F2/34 C08F10/02 C08F6/10 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method for polymerisation of ethylene or copolymerisation of ethylene with other 1-olefins. The invention describes a method for polymerisation of ethylene or ethylene with other 1-olefins in accordance with which ethylene polymerises in the presence of a catalyst in a gas-phase reactor (1) with formation of polymer particles. In order to tap polymerisation heat, there is a circulating reaction gas which contains propane and non-polymerised ethylene in which polymer particles are continuously or discretely output from the reactor (1). Polymer particles are separated from the larger portion of the accompanying gas and degassed. Gas is released from the captured fine particles. Gas is separated from the low-boiling fraction which contains ethylene or from the high-boiling fraction which contains other 1-olefins or alkanes with 4-12 carbon atoms at the first separation step. The propane fraction is separated at the second separation step and then used to degas polymer particles coming from the reactor, where partial pressure of ethylene in the propane fraction used for degassing is less than 6000 Pa under degassing conditions, and total partial pressure of other 1-olefins and alkanes with 4-12 carbon atoms in the propane fraction is less than 10000 Pa. Described also are apparatus for realising the said method (versions), as well as use of propane in which the fraction of ethylene, which is expressed through partial pressure, is less than 6000 Pa under degassing conditions, and the fraction of 1-olefins and alkanes with 4-12 carbon atoms, expressed through partial pressure, is less than 10000 Pa under degassing conditions, and which is obtained from the gas coming out of the gas-phase polymerisation reactor together with polymer particles, for degassing particles of ethylene homopolymers or copolymers in the method described above.

EFFECT: tapping a large amount of heat from the reactor, sufficient for degassing output polymer particles, high extraction ratio of the reaction gas.

18 cl, 2 dwg, 1 tbl, 2 ex