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Method of polymerizing olefin

A technology for olefins and polymerization reactors, which is applied in the field of polymerizing olefins such as ethylene and propylene, and can solve problems such as complex valve operations and the need for intermediate reactors

Inactive Publication Date: 2003-05-21
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these conventional methods are still unsatisfactory because they require intermediate reactors, complicated valve operations, etc.

Method used

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  • Method of polymerizing olefin
  • Method of polymerizing olefin

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Experimental program
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Embodiment 1

[0135] use figure 1 In the shown plant, a low molecular weight propylene homopolymer is produced in a first reactor 6 and a high molecular weight propylene-ethylene copolymer with a high intrinsic viscosity [η] of the copolymer fraction is produced in a second reactor 8 .

[0136] The capacity of each reactor is 200L. Titanium tetrachloride supported on a magnesium support was fed from tube 2 to the first reactor 6 at a rate of about 0.04 g / hr (expressed as titanium), while propylene was fed from tube 1 at a rate of 37.5 kg / hr. Triethylaluminum as an organoaluminum compound and dicyclopentyldimethoxysilane as an electron donor were continuously fed into the first reactor 6 through pipes 4 and 5 at a molar ratio of 4:1, respectively. In addition, hydrogen as a molecular weight regulator was fed to the first reactor 6 from the pipe 3 at a rate of 395 L / hr.

[0137]In the first reactor 6, propylene was subjected to vapor phase polymerization at 80°C and 3.0 MPa·G. The resultin...

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Abstract

The process for polymerizing olefins uses a plurality of series-cannected polymerization reactors in which at least one of second and subsequent reactors is a vapor-phase polymerization reactor containing a multicomponent gas. The process comprises the steps of: taking the multicomponent gas out of the vapor-phase polymerization reactor; mixing the multicomponent gas with an inert gas which is lighter than at least one component of the multicomponent gas, thereby obtaining a mixed gas; compressing and / or cooling the mixed gas to liquefy a part of the multicomponent gas; discharging at least a part of a gaseous mixture comprising the inert gas and an unliquefied multicomponent gas out of a reaction system; and returning a fluid comprising the remainder of the gaseous mixture and the liquefied multicomponent gas to the vapor-phase polymerization reactor. By mixing the multicomponent gas taken out of the vapor-phase polymerization reactor with the inert gas, the composition of gas in the vapor-phase polymerization reactor is effectively controlled, thereby ensuring a stable production of olefin polymers of a desired molecular weight distribution and composition.

Description

field of invention [0001] The present invention relates to a process for polymerizing olefins such as ethylene and propylene, and more particularly to a process for polymerizing olefins using a multi-stage polymerization apparatus comprising a vapor phase polymerization reactor in which the second- or subsequent-stage vapor-phase The composition of the gas in the polymerization reactor is easy to control. Background technique [0002] Among conventional industrial processes for polymerizing olefins such as ethylene and propylene, the vapor phase polymerization process has received particular attention because recent improvements in catalyst activity in this process have eliminated the need for deliming the polymer product to remove catalyst residues. But in the conventional continuous multi-stage vapor phase polymerization process, the gas composition in the earlier stage polymerization reactor directly affects the gas composition in the later stage polymerization reactor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F2/34C08F10/00C08F110/06C08F210/06C08F297/08C08L23/02
CPCY10S526/901C08L2308/00C08F297/08C08F297/083C08F110/06C08F10/00C08F210/06Y10S526/905C08L23/02C08F2/001C08F2/34C08F4/6543C08L2666/04C08F210/16C08F2500/17
Inventor 佐藤秀树荒木伸二安达启示
Owner IDEMITSU KOSAN CO LTD