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Multistage polymerization method and device of propylene

A polymerization method and propylene technology, applied in the field of polymer material preparation, can solve the problems of small difference in monomer composition, limited improvement of polymer mechanical properties and processing properties, etc., and achieve low volatile organic content, excellent mechanical properties, wide range Effect of Molecular Weight Distribution

Pending Publication Date: 2018-01-19
ZHEJIANG SATELLITE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing propylene polymerization process, each reactor is mainly operated in series, or single reactor operation, only one catalyst system can be used, and the difference in monomer composition between reactors is small, and the mechanical properties and processability of the polymer are limited.

Method used

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  • Multistage polymerization method and device of propylene

Examples

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Embodiment 1

[0042] Example 1 see figure 1 , the propylene multi-stage polymerization device of the present invention, comprising:

[0043]The prepolymerization reaction unit 1 comprises two parallel prepolymerization reactors 11, 11', propylene coolers 10, 10' corresponding to the prepolymerization reactors, and the prepolymerization reactors 11, 11' are provided with material inlets and Outlet, the propylene cooler 10, 10' is connected to the material inlet of the prepolymerization reactor 11, 11';

[0044] Liquid-phase polymerization reaction unit 2, comprising two liquid-phase polymerization reactors 21, 21', two propylene condensers 22, 22', two liquid-separation tanks 23, 23' respectively corresponding to the two pre-polymerization reactors 11, 11' , two circulating air blowers 24, 24'; wherein, liquid phase polymerization reactor 21, 21' is provided with material inlet and outlet, gas phase propylene outlet, liquid phase propylene inlet, gas phase propylene inlet; liquid separation...

Embodiment 2

[0070] Example 2 The process of producing broad molecular weight distribution, high crystallization impact copolymer polypropylene is as follows:

[0071] Normal-temperature liquid-phase propylene (25°C, 3.5-4.5MPag) is cooled to 5-10°C through propylene coolers 10 and 10', and enters prepolymerization reactors 11 and 11' respectively. Carry out the prepolymerization reaction, wherein, the catalyst system A that can improve the molecular weight distribution of the polymer is added in the prepolymerization reactor 11, and the catalyst system B that improves the crystallinity of the polymer is added in the prepolymerization reactor 11', and the catalysts are all in the propylene polymerization reaction common catalysts.

[0072] The residence time of the catalyst in each pre-polymerization reactor is 12-17 minutes. The pre-polymerization reactor is operated with a full tank, and the catalyst and propylene are mixed evenly through the stirrer. The reaction temperature is 22-28 °C...

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Abstract

The invention discloses a multistage polymerization method and device of propylene. The method comprises the following steps: firstly, separately carrying out pre-polymerization reaction, and then carrying out liquid-phase polymerization reaction, wherein the liquid-phase polymerization reaction is provided with two reaction zones, and material composition in the two reaction zones and reaction systems are identical or different; then carrying out gas-phase polymerization reaction and fourth-stage gas-phase polymerization reaction. According to the multistage polymerization method and device disclosed by the invention, a parallel-connected pre-polymerization way and a parallel-connected liquid-phase polymerization reaction way are adopted, differential control on the reaction systems is realized, and reaction time is improved, so that polymers have wider molecular weight distribution, have higher molecular weight and have lower melt indexes; melt index differences of all sections of polymers can be further expanded, and the processing performance and mechanical performance of the polymers are improved. By utilizing the method and the device disclosed by the invention, polypropylenehomopolymers, binary polypropylene random copolymers and ternary polypropylene copolymers or impact-resistant polypropylene copolymers with high rubber content can be produced; the prepared polymersare uniform in distribution of particle sizes, and have low volatile organic compound content, wide molecular weight distribution and excellent mechanical performance and processing performance.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and in particular relates to a multi-stage polymerization method and device for propylene. Background technique [0002] In the existing propylene polymerization process, each reactor is mainly operated in series or single reactor, and only one catalyst system can be used, and the difference in monomer composition between reactors is small, and the improvement of polymer mechanical properties and processability is limited. . Contents of the invention [0003] The purpose of the present invention is to provide a multi-stage polymerization method and device for propylene, which adopts parallel prepolymerization and parallel liquid phase polymerization reaction modes to differentially control the reaction system, reduce the monomer content in the polymer, and control the polymer content. Volatile organic compound content, uniform polymer particle size distribution, excellent mechanical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F2/01C08F2/02C08F2/34C08F210/06C08F210/16C08F110/06
Inventor 郑碧磊陈秀平王彩霞范昌海杨卫东
Owner ZHEJIANG SATELLITE ENERGY CO LTD
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