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Title:
PHASE-STABILIZED ETHYLENE ALPHA OLEFIN COPOLYMERIZATION PROCESS
Document Type and Number:
WIPO Patent Application WO/2019/137634
Kind Code:
A1
Abstract:
A process for copolymerizing ethylene and at least one C3 to C8 alpha olefin to obtain an ethylene-C3 to C8 alpha olefin copolymer, the process comprising a) copolymerizing ethylene and at least one C3 to C8 alpha olefin in a solvent in a solution polymerization reactor to obtain an intermediate polymer solution, b) discharging an effluent stream from the intermediate polymer solution into a heat exchanger, c) setting the temperature of the effluent stream in the heat exchanger to obtain a heated effluent stream, d) feeding the heated effluent stream to a flash separation, e) separating at least a part of the ethylene-C3 to C8 alpha olefin copolymer in the flash separation, characterized by feeding an inert hydrocarbon fulfilling 90 °C < T(BP) < 130 °C to the solution polymerization reactor; and/or accumulating an inert hydrocarbon fulfilling 90 °C < T(BP) < 130 °C during the polymerization reaction; and/or feeding an inert hydrocarbon fulfilling 90 °C < T(BP) < 130 °C to the discharged effluent stream of step b).

Inventors:
AL-HAJ ALI, Mohammad (Borealis Polymers Oy, P.O. Box 330, Porvoo, FIN-06101, FI)
SLEIJSTER, Henry (Borealis Plastomers B.V, Koolwaterstofstraat 1, 6161 Sittard-Geleen, 6161, NL)
Application Number:
EP2018/063384
Publication Date:
July 18, 2019
Filing Date:
May 22, 2018
Export Citation:
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Assignee:
BOREALIS AG (Wagramer Strasse 17-19, 1220 Vienna, 1220, AT)
International Classes:
C08F2/04; C08F210/02
Domestic Patent References:
WO2002034795A12002-05-02
WO2016204874A12016-12-22
WO2011087729A22011-07-21
WO1993025590A11993-12-23
WO1987003604A11987-06-18
Foreign References:
CA2598960A12009-02-27
US20080033127A12008-02-07
US20100063338A12010-03-11
EP0280352A11988-08-31
EP0280353A11988-08-31
EP0286148A11988-10-12
US5001205A1991-03-19
US5001244A1991-03-19
Other References:
DE LOOS ET AL.: "Liquid - Liquid Phase Separation in Linear Low Density Polyethylene Solvent Systems", FLUID PHASE EQUILIBRIA, vol. 117, 1996, pages 40 - 47
IRANI ET AL.: "Lower Critical Solution Temperature Behavior of Ethylene Propylene Copolymers in Multicomponent Systems", JOURNAL OF APPLIED POLYMER SCIENCE, vol. 31, 1986, pages 1879 - 1899
CHAN ET AL.: "Fluid-Liquid Transitions of Poly(ethylene-co-octene-1) in Supercritical Ethylene Solutions", IND. ENG. CHEM. RES., vol. 39, 2000, pages 4370 - 4375
NAGY ET AL.: "High pressure phase equilibria in the system linear low density polyethylene + isohexane: Experimental results and modelling", J. OF SUPERCRITICAL FLUIDS, vol. 40, 2007, pages 125 - 133, XP005731203, DOI: doi:10.1016/j.supflu.2006.04.005
"Handbook of Polymer Synthesis, Characterization, and Processing", 2013, JOHN WILEY & SONS, INC, pages: 317 - 334
"Handbook of Polymer Synthesis, Characterization, and Processing"
Attorney, Agent or Firm:
KADOR & PARTNER PARTG MBB (Corneliusstr. 15, Munich, 80469, DE)
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