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A system and method for olefin polymerization

A technology for olefin polymerization and polymerization of monomers, applied in the field of olefin polymerization systems, can solve the problems of high energy consumption, increased investment, difficulty in separation and recovery, etc.

Active Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the patent still adopts the slurry reaction in the last stage reaction, compared with the gas phase reaction, there are more materials that need to be recovered when the reaction is discharged, the separation and recovery are more difficult, the energy consumption is large and the investment needs to be increased.

Method used

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  • A system and method for olefin polymerization
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  • A system and method for olefin polymerization

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Embodiment 1

[0075] like figure 1 As shown, polyethylene with ultra-wide molecular weight distribution is produced in three series-connected reactors with an output of 300,000 tons / year, and the production rate distribution of the three reactors is 50:5:45. In the process, the Ziegler-Natta catalyst, diluent isobutane, ethylene, and hydrogen enter the first reactor 1—the loop reactor, with a reaction temperature of 95° C. and a pressure of 4.0 MPa. The feed rate of ethylene is 19962kg / hr, and the feed rate of hydrogen is adjusted so that the hydrogen / ethylene molar ratio in the slurry is 0.234. The output of polyethylene in the reactor effluent was 18750kg / hr, and the mass fraction of polymer in the slurry was 45%.

[0076] After the loop reactor effluent is decompressed, its temperature becomes 65°C, the pressure is 1.25MPa, and it contains 35.5% gas phase composition, and then enters the second reactor 4—the stirred tank reactor. The reaction temperature of the reactor is 75° C., and ...

Embodiment 2

[0080] The operating conditions and material composition selection of the first reactor 1 and the third reactor 6 are the same as in Example 1, and by adjusting the separation capacity of the intermediate separation unit 10, the operating conditions of the second reactor 4—the stirred tank reactor are controlled , to achieve the purpose of producing the second type of ultra-wide molecular distribution polyethylene.

[0081] The reaction temperature of the second reactor is 75° C., and the pressure is 1.6 MPa. No comonomer is added to the reactor, the fresh feed only contains ethylene, and the flow rate is 1098kg / hr. The amount of diluent isobutane entering the reactor is controlled by the separation unit 10 to ensure normal operation of the slurry reaction. The hydrogen / ethylene molar ratio in the reactor was 0.106. The flow rate of polyethylene in the reactor effluent is 20625kg / hr, and the mass fraction of polymer in the slurry is 43%.

[0082] The reactor effluent is the ...

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Abstract

The invention provides an alkene polymerization system and method. The system comprises more than three reactors connected in series. The first reactor is one or more than two annular pipe reactors; the second reactor is one or more than two stirring kettle reactors; and the third reactor is one or more than two gas-phase fluidized-bed reactors. A catalyst and a reaction material enter a first reactor and is subjected to a polymerization reaction; the reaction product with the catalyst enters the second reactor, the material is supplemented into the second reactor, and a reaction is carried out; the product from the outlet of the second reactor enters the third reactor, the material is supplemented into the third reactor, and a reaction is carried out; and a final product is obtained in the third reactor. The system and method provided by the invention is used for producing ultra-wide-molecular-weight-distribution polyolefin with excellent mechanism performances and processing performances.

Description

technical field [0001] The present invention relates to the field of polymer polymerization, and furthermore, relates to a system and method for olefin polymerization. Background technique [0002] The processability and mechanical properties of polyolefin resin are contradictory. Increasing the molecular weight will help to improve the mechanical properties of the resin, but at the same time it will make the processing of the resin difficult. The broad peak (sometimes also called bimodal or multimodal) polyolefin resin can achieve a balance of material processability and mechanical properties, and the low molecular weight part can ensure that the resin has good processability, while the high molecular weight part gives the material long-term durability. Mechanical properties, such as high tensile properties, high toughness and impact strength, etc. Reactor series combination process is currently the most widely used industrial method for producing polyolefin resins with br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/00C08F2/01
Inventor 骆广海阳永荣王靖岱王树芳张瑞琪李晓霞蒋斌波何乐路
Owner CHINA PETROLEUM & CHEM CORP
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