REACTOR SYSTEM FOR POLYMERIZATION OF POLYMODAL POLYETHYLENE Russian patent published in 2021 - IPC C08F2/00 C08F2/01 C08F2/12 C08F2/18 B01J19/00 C08L23/04 C08L23/06 

Abstract RU 2757917 C2

FIELD: chemical industry.

SUBSTANCE: method for producing a polymodal polyethylene composition includes polymerization of ethylene in a reactor system containing three ethylene reactors and a hydrogen removal unit installed between the first and the second reactors. Polymerization of ethylene in the first reactor is carried out in an inert hydrocarbon medium, as which hexane is used, in the presence of a catalytic system and hydrogen to obtain low-molecular or medium-molecular polyethylene. Then, 98.0-99.8 wt.% of hydrogen contained in a suspension mixture obtained in the first reactor is removed. In the second reactor, polymerization of ethylene is carried out in the presence of residual hydrogen to obtain the first high-molecular polyethylene. In the third reactor, polymerization of ethylene is carried out to obtain the second high-molecular polyethylene. Production of the polymodal polyethylene composition is carried out by separating hexane from a suspension unloaded from the third reactor. A polymodal polyethylene composition for molding is also proposed.

EFFECT: invention provides for improving mechanical properties of obtained polymodal polyethylene composition.

9 cl, 2 tbl, 6 ex

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RU 2 757 917 C2

Authors

Tiyapiboonchaiya, Piyawan

Samphawamontri, Patcharin

Klomkamol, Warachad

Dates

2021-10-22Published

2017-09-07Filed