METHOD OF PRODUCING MULTIMODAL POLYOLEFIN POLYMER WITH IMPROVED HYDROGEN REMOVAL Russian patent published in 2015 - IPC C08F2/18 C08F10/00 C08L23/00 B01J8/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a multimodal polyolefin polymer and an apparatus for production thereof. A method of production at temperature of 40-150°C and pressure of 0.1-20 MPa in the presence of a polymerisation catalyst in a first and a second polymerisation reactor connected in series, where in the first reactor a first polyolefin polymer is obtained in suspension in the presence of hydrogen and in the second reactor a second polyolefin polymer is obtained in the presence of a lower hydrogen concentration than in the first reactor, the method comprising: a) withdrawing from the first reactor a suspension of solid polyolefin particles in a suspension medium containing hydrogen; b) feeding the suspension into a flash drum at a lower pressure than that of the first reactor; c) vaporising part of the suspension medium; d) withdrawing a hydrogen-depleted suspension from the flash drum and feeding it into the second reactor; e) separating gas from the gas-phase of the flash drum and feeding it into a heat exchanger; f) condensing part of the gas separated from the flash drum; and g) returning the liquid obtained in the heat exchanger to the polymerisation process at a point where suspension is present.

EFFECT: apparatus for producing a multimodal polyolefin polymer is described.

14 cl, 2 dwg