Title:
METHOD FOR PREPARING POLYPROPYLENE OR PROPYLENE-ETHYLENE COPOLYMER
Document Type and Number:
WIPO Patent Application WO/2019/090883
Kind Code:
A1
Abstract:
A method for preparing polypropylene or a propylene-ethylene copolymer, comprising: (1) subjecting a liquid phase propylene together with a polymerization catalyst to a prepolymerization of propylene, into a feedstock slurry containing a propylene prepolymer, wherein the prepolymerization temperature is 40ºC-45ºC, the prepolymerization pressure is 3.2-3.9 MPaG, and the olefin polymerization catalyst is 0.04-0.06 wt % of the liquid phase propylene; (2) mixing the feedstock slurry, a recovered liquid phase propylene and a recovered and recycled hydrogen gas into a liquid phase polymeric raw material; (3a) subjecting the liquid phase polymeric raw material to a liquid phase homopolymerization of propylene and a gas phase homopolymerization of propylene, into a product containing a propylene homopolymer; or (3b) subjecting the liquid phase polymeric raw material to liquid phase copolymerization and gas phase random copolymerization, with ethylene, into a product containing a propylene-ethylene random copolymer, wherein the feed amount of ethylene is less than 5 wt% of the liquid phase propylene; performing gas-solid separation of the product, separating out the polymer and recovering propylene and hydrogen gas. The method can reduce the energy consumption per unit product, and propylene loss.
Inventors:
LI ZEMIN (CN)
LIU LIXIN (CN)
CUI ZHONG (CN)
CHEN HONG (CN)
LIU LIYAN (CN)
WU XIA (CN)
LIU LIXIN (CN)
CUI ZHONG (CN)
CHEN HONG (CN)
LIU LIYAN (CN)
WU XIA (CN)
Application Number:
PCT/CN2017/115399
Publication Date:
May 16, 2019
Filing Date:
December 11, 2017
Export Citation:
Assignee:
BEIJING HUAFU ENG CO LTD (CN)
International Classes:
C08F10/06; C08F2/02; C08F2/34; C08F4/646; C08F110/06; C08F210/06
Foreign References:
| CN102020733A | 2011-04-20 | |||
| CN101942051A | 2011-01-12 | |||
| CN106543330A | 2017-03-29 |
Attorney, Agent or Firm:
RUNPING&PARTNERS (CN)
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