Method and device for producing polyolefin through dynamical operation

A technology of dynamic operation and polyolefin, applied in the direction of chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low cost and high catalyst requirements, achieve easy operation, simple process flow, reduce equipment investment costs and operating costs Effect

Active Publication Date: 2017-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of producing polyethylene in a single reactor with a composite catalyst is relatively low in cost and easy to implement, but it has higher requirements on the catalyst

Method used

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  • Method and device for producing polyolefin through dynamical operation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] exist figure 1 The broad-peak polyethylene of an olefin polymerization method shown, ethylene, 1-butene, hydrogen, nitrogen, isopentane, high-activity titanium catalyst, TEAL cocatalyst are introduced into fluidized bed reactor 1, and the polymerization reaction temperature is 80 ℃, pressure 2.1MPa, fluidized bed reactor 1 maintains a dense-phase bed state, the circulating material enters at the bottom of the fluidized bed reactor, the superficial velocity of the gas material is 0.60m / s, and the polyethylene powder in fluidized bed 1 is maintained of fluidization. The hydrogen absorption tower 10 is filled with a lanthanum-nickel hydrogen storage alloy. The time ratio between the first production stage and the second production stage is 8:2. In the first production stage, a stream of gas is drawn from the circulation loop between the gas-liquid separator 5 and the fluidized bed reactor 1, and enters the hydrogen absorption tower 10 after exchanging heat with the third...

Embodiment 2

[0078] exist figure 1A broad-peak polyethylene in the olefin polymerization method shown, ethylene, 1-butene, hydrogen, nitrogen, n-hexane, highly active titanium catalyst, and TEAL cocatalyst are introduced into fluidized bed reactor 1, and the polymerization reaction temperature is 90°C , the pressure is 2.5MPa, the fluidized bed reactor 1 maintains a dense phase bed state, the circulating material enters at the bottom of the fluidized bed reactor, the superficial velocity of the gaseous material is 0.65m / s, and the polyethylene powder in the fluidized bed 1 is maintained Fluidize. The hydrogen absorption tower 10 is filled with a lanthanum-nickel hydrogen storage alloy. The time ratio between the first production stage and the second production stage is 8:2. In the first production stage, a stream of gas is drawn from the circulation loop between the gas-liquid separator 5 and the fluidized bed reactor 1, and enters the hydrogen absorption tower 10 after exchanging heat w...

Embodiment 3

[0081] exist figure 1 A broad-peak polyethylene in the olefin polymerization method shown, ethylene, 1-hexene, hydrogen, nitrogen, isopentane, highly active titanium catalyst, and TEAL cocatalyst are introduced into fluidized bed reactor 1, and the polymerization reaction temperature is 85 ℃, pressure 2.1MPa, fluidized bed reactor 1 maintains a dense-phase bed state, the circulating material enters at the bottom of the fluidized bed reactor, the superficial velocity of the gas material is 0.68m / s, and the polyethylene powder in fluidized bed 1 is maintained of fluidization. The hydrogen absorption tower 10 is filled with a lanthanum-nickel hydrogen storage alloy. The time ratio between the first production stage and the second production stage is 8:2. In the first production stage, a stream of gas is drawn from the circulation loop between the gas-liquid separator 5 and the fluidized bed reactor 1, and enters the hydrogen absorption tower 10 after exchanging heat with the th...

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Abstract

The invention discloses a method and device for producing polyolefin through dynamical operation. The method comprises the following steps: introducing at least one olefin and at least one catalyst into a fluidized bed reactor to react to generate two-peak/broad-peak polyolefin through contact of olefin and the catalyst; and absorbing hydrogen from circulating flow or releasing hydrogen to circulation flow by virtue of hydrogen storage alloy or other hydrogen absorbing materials to periodically change the concentration of hydrogen in a fluidized bed to generate different reaction environments in the same reactor to periodically and sequentially change product quality indexes of polyolefin, so as to obtain a two-peak/broad-peak polyolefin product.

Description

technical field [0001] The invention discloses a method and a device for dynamically operating and producing polyolefin. In particular, it relates to a method and a device for producing olefin homopolymer and olefin copolymer by using a fluidized bed reactor. Background technique [0002] The invention relates to an olefin polymerization operation method, specifically, introducing polymer monomers, condensing agents, chain transfer agents, etc. into a fluidized bed reactor in the form of gas or liquid, and periodically absorbing and releasing chains through hydrogen storage materials Transfer agent hydrogen, so that ethylene and α-olefins experience different reaction environments at different times in a fluidized bed reactor, and produce products with different molecular weight distributions, and the final product is a wide or bimodal molecular weight distribution. Process for olefin copolymers or polyolefin copolymers. [0003] For polyolefins, especially polyethylene, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/08C08F210/14C08F2/01C08F2/00B01J8/24
CPCB01J8/24C08F2/001C08F2/01C08F210/16C08F210/08C08F210/14C08F2500/05
Inventor 王靖岱范小强孙婧元黄正梁杨遥廖祖维蒋斌波阳永荣陈毓明王浩同洪小东柳莺刘仲玄田思航葛世轶陈思羽郭燕妮
Owner ZHEJIANG UNIV
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