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Method and device for polymerization of olefins

An olefin polymerization and olefin technology, which is applied in the production of polyolefins and polyolefin copolymers, can solve the problems of complicated operation methods and high equipment investment, and achieve the effect of high separation efficiency, strong practical significance and application value, and increased flexibility.

Active Publication Date: 2015-05-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has problems such as complicated operation method and high equipment investment

Method used

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  • Method and device for polymerization of olefins
  • Method and device for polymerization of olefins
  • Method and device for polymerization of olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1: (VLDPE)

[0055] exist figure 1 The production of ultra-low density polyethylene (VLDPE) by an olefin polymerization method shown, under the action of the Z-N catalyst system, the polymerization reaction temperature is 80 ° C, the pressure is 2.3 MPa, and ethylene, butene, and hexene are reacted in a fluidized bed. Ternary copolymerization reaction occurs in the reactor, and the superficial velocity of the reactor is 0.61m / s. The circulating gas stream in pipeline 13 includes hydrogen, nitrogen, methane, ethane, ethylene, butene, inert C4, isopentane and hexene, the temperature is 81°C, and the pressure is 2.3MPa. The unreacted gas material is taken out from the top outlet of the reactor 2, enters the compressor 3 inlet with fresh polymerized monomers, chain transfer agents, and inert gas nitrogen, and then passes through the heat exchanger 4 (such as a fixed tube-sheet heat exchanger) , the circulating air flow is partially condensed, and the liquid mix...

Embodiment 2

[0062] Embodiment 2: (VLDPE)

[0063] exist figure 1 The production medium density polyethylene (VLDPE) of a kind of olefin polymerization method shown, under the effect of Z-N catalyst system, polymerization reaction temperature is 80 ℃, pressure 2.3MPa, in ethylene, butene, hexene in the fluidized bed reactor The three-way copolymerization reaction occurs inside, and the superficial velocity of the reactor is 0.57m / s. The circulating gas flow in pipeline 13 includes hydrogen, nitrogen, methane, ethane, ethylene, isopentane and hexene, the temperature is 80°C, and the pressure is 2.3MPa. The unreacted gas material is taken out from the top outlet of the reactor 2, enters the compressor 3 inlet with fresh polymerized monomers, chain transfer agents, and inert gas nitrogen, and then passes through the heat exchanger 4 (such as a fixed tube-sheet heat exchanger) , partial condensation of the circulating airflow occurs, and the liquid mixture accounts for 13.2wt% of the circula...

Embodiment 3

[0066] Embodiment 3: (LLDPE)

[0067] exist figure 1 The production of linear low-density polyethylene (LLDPE) in a kind of olefin polymerization method shown, under the action of Z-N catalyst system, the polymerization reaction temperature is 90 ℃, the pressure is 2.3MPa, and ethylene and hexene occur in the fluidized bed reactor. For binary copolymerization, the superficial velocity of the reactor is 0.65m / s. The circulating gas stream in pipeline 13 includes hydrogen, nitrogen, methane, ethane, ethylene, isopentane and hexene at a temperature of 90°C and a pressure of 2.3 MPa. The unreacted gas material is taken out from the top outlet of the reactor 2, enters the compressor 3 inlet with fresh polymerized monomers, chain transfer agents, and inert gas nitrogen, and then passes through the heat exchanger 4 (such as a fixed tube-sheet heat exchanger) , the circulating air flow is partially condensed, and the liquid mixture accounts for 20.0wt% of the circulating air flow. T...

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Abstract

The invention discloses a method and a device for the polymerization of olefins. The method comprises the following steps: introducing an unreacted gas material out from the outlet of a fluidized bed reactor, compressing, condensing and carrying out gas-liquid separation in a circulation pipeline, feeding partial and all liquid material into a rectifying tower, cooling top products and bottom products and introducing into a reactor from different positions above a reactor distribution plate; introducing a residual liquid material and a gas material below a polymerization reactor distribution plate; contacting the gas material and the liquid material in the fluidized bed and the added catalyst to form solid phase polyolefin and continuously or intermittently introducing the solid phase polyolefin from the reactor out. According to the method, co-monomer is further separated by virtue of the rectifying tower and the separated co-monomer is introduced into the different positions of the reactor, so that different reaction environments are caused in the same reactor and the products with excellent properties are obtained.

Description

technical field [0001] The invention discloses an olefin polymerization method and device. In particular, it relates to a method and a device for producing polyolefin and polyolefin copolymer by using a fluidized bed reactor. Background technique [0002] The present invention designs a kind of olefin polymerization operation method, specifically is to introduce polymerization monomer, condensing agent, chain transfer agent etc. into the fluidized bed reactor in the form of gas or liquid, make ethylene, α-olefin in a fluidized bed A method for producing solid-phase polyolefins and polyolefin copolymers through continuous polymerization reactions in different reaction environments in a reactor. [0003] The traditional gas-phase fluidized-bed polymerization reactor consists of a fluidized-bed reactor, a circulating gas compressor, and a circulating gas cooler. It is a closed circulation loop that can produce a variety of polyolefins. Olefin polymers produced in fluidized be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/00C08F10/02C08F2/01C08F2/34
Inventor 王靖岱范小强黄正梁廖祖维胡东芳胡晓波訾灿陈美陈毓明屠高女蒋斌波阳永荣柳莺时强王浩同颜攀杨炎明葛世轶
Owner ZHEJIANG UNIV
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