A method for preparing olefin polymers using multi-temperature reaction zones

An olefin polymer and a technology for olefin polymerization, which are applied in the field of preparing olefin polymers by using multi-temperature reaction zones, can solve the problems of unsuitable reaction exothermic polyethylene, low heat transfer efficiency in the descending section, mutual interference of gases, etc. Heat removal ability, improved space-time yield, and the effect of not easy to stick or agglomerate

Active Publication Date: 2017-06-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process has the following problems: on the one hand, the heat transfer efficiency of the descending section in the moving bed state is not high, which is not suitable for the production of polyethylene with a large reaction heat release; on the other hand, this process still cannot solve the two problems well. The problem of gas interference in the reaction area
These unfavorable factors restrict the application of this technology in the production process of ethylene polymerization where the heat of polymerization reaction is relatively large

Method used

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  • A method for preparing olefin polymers using multi-temperature reaction zones
  • A method for preparing olefin polymers using multi-temperature reaction zones
  • A method for preparing olefin polymers using multi-temperature reaction zones

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Experimental program
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Effect test

Embodiment 1

[0102] in such as figure 1 In the shown fluidized bed reactor 2 with nitrogen fluidization, at first, a small amount of catalyst and cocatalyst are continuously input in an amount of 0.1 kg / h through the pipeline 11, and ethylene is input through the pipeline 14, and 1 through the pipeline 15. -Butene raw material gas and pipeline 16 input a small amount of isopentane condensing agent to start the initial olefin polymerization reaction in the fluidized bed reactor to generate a small amount of polyethylene. Then gradually increase the consumption of catalyst and cocatalyst to 5kg / h, and gradually increase the consumption of isopentane, and keep the fluidization gas velocity constant. Along with the progress of reaction, continue to input ethylene through pipeline 14, pipeline 15 continues to input 1-butene raw material gas, thereby constitute circulating medium in fluidized bed reactor, described circulating medium comprises hydrogen, nitrogen, ethylene, 1 -Butene and isopent...

Embodiment 2

[0112] in such as figure 1 In the shown fluidized bed reactor 2 with nitrogen fluidization, at first, a small amount of catalyst and cocatalyst are continuously input in an amount of 0.1 kg / h through the pipeline 11, and ethylene is input through the pipeline 14, and 1 through the pipeline 15. - Hexene raw material gas and pipeline 16 input a small amount of isopentane condensing agent to start the initial olefin polymerization reaction in the fluidized bed reactor to generate a small amount of polyethylene. Then gradually increase the consumption of catalyst and cocatalyst to 5kg / h, and gradually increase the consumption of isopentane, and keep the fluidization gas velocity constant. Along with the progress of reaction, continue to input ethylene through pipeline 14, pipeline 15 continues to input 1-hexene raw material gas, thereby constitute circulating medium in fluidized bed reactor, described circulating medium comprises hydrogen, nitrogen, ethylene, 1 - Hexene and isope...

Embodiment 3

[0122] in such as figure 1 In the shown fluidized bed reactor 2 with nitrogen fluidization, at first, a small amount of catalyst and cocatalyst are continuously input in an amount of 0.1 kg / h through the pipeline 11, and ethylene is input through the pipeline 14, and 1 through the pipeline 15. -Butene and 1-hexene raw material gas and pipeline 16 input a small amount of isopentane condensing agent to start the initial olefin polymerization reaction in the fluidized bed reactor to generate a small amount of polyethylene. Then gradually increase the consumption of catalyst and cocatalyst to 5kg / h, and gradually increase the consumption of isopentane, and keep the fluidization gas velocity constant. Along with the progress of reaction, continue to input ethylene by pipeline 14, pipeline 15 continues to input 1-butene and 1-hexene raw material gas, thereby constitute circulating medium in fluidized bed reactor, described circulating medium comprises hydrogen, Nitrogen, Ethylene, ...

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Abstract

The invention discloses a method for preparing olefin polymer by utilizing multiple temperature reaction areas. The method provided by the invention comprises the following step of forming a plurality of olefin polymer reaction areas with different temperatures in a fluidized bed reactor by utilizing a circulating medium, wherein the circulating medium comprises an olefin monomer and a condensing agent. By utilizing the method, preparation of high-performance olefin polymer product by utilizing a single reactor is realized. The method is high in heat transfer efficiency. The olefin polymer prepared by utilizing the method is low in density, wide in distribution, uniform in degree of crystallinity and the like and can be widely applied to various fields of thin-film materials and the like.

Description

technical field [0001] The invention relates to a method for preparing olefin polymers, in particular to a method for preparing olefin polymers using multi-temperature reaction zones. Background technique [0002] As we all know, olefin polymers are widely used in various fields, and its rigidity, toughness and lightness are irreplaceable by many materials. To improve and enhance the performance of olefin polymers is the goal that researchers are constantly pursuing. [0003] In the traditional olefin polymerization process, the typical method is to use reactors in series to polymerize to produce polyolefin with double / broad peak molecular weight distribution. This method can make the product have excellent performance and processing performance, so as to achieve high product yield Performance. For example, patent WO2009 / 076733A1 discloses "a process for producing ultra-high molecular weight polyethylene by slurry method", olefins form lower molecular weight polymers at hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F210/16C08F2/01
Inventor 王靖岱阳永荣吴文清黄正梁韩国栋蒋斌波廖祖维孙婧元范小强胡晓波陈毓明杜焕军王晓飞胡东芳时强柳莺陈美杨炎明王浩同
Owner ZHEJIANG UNIV
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