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Multi-reactor olefin polymerization system composed of liquid-phase loop pipe and horizontal gas phase and polymerization method

A loop reactor and olefin polymerization technology, applied in the field of olefin polymerization, can solve the problems of increasing the difficulty of polymer devolatilization, high cost, lowering the quality of polypropylene, etc. The effect of particle shape

Pending Publication Date: 2020-11-27
迈瑞尔实验设备(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the polypropylene plant using these processes will consume hundreds of tons of hexane every year. These hexanes are not only expensive, but also most of the hexane residues in the powder increase the volatile content of polypropylene, thus greatly increasing the follow-up process. Difficulty in polymer devolatilization, reducing the quality of polypropylene

Method used

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  • Multi-reactor olefin polymerization system composed of liquid-phase loop pipe and horizontal gas phase and polymerization method
  • Multi-reactor olefin polymerization system composed of liquid-phase loop pipe and horizontal gas phase and polymerization method
  • Multi-reactor olefin polymerization system composed of liquid-phase loop pipe and horizontal gas phase and polymerization method

Examples

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Embodiment 1

[0054] This embodiment provides an olefin polymerization system, such as figure 1 As shown, it includes a reaction unit, which includes a liquid phase loop reactor group and a horizontal gas phase stirred reactor group, and the liquid phase loop reactor group is connected with the horizontal gas phase stirred reactor group; The liquid-phase loop reactor group includes two liquid-phase loop reactors R1 and R2, and the liquid-phase loop reactor R1 and the liquid-phase loop reactor R2 are connected in series; the horizontal gas-phase stirred reactor The group includes two horizontal gas phase stirred reactors R3 and R4, and an air lock system is connected in series between the horizontal gas phase stirred reactor R3 and the horizontal gas phase stirred reactor R4.

[0055] The reaction unit also includes a prepolymerization reactor, which is connected to the liquid phase loop reactor group. Specifically, the prepolymerization reactor is connected to the liquid phase loop reactor...

Embodiment 2

[0064] An olefin polymerization method, which adopts the olefin polymerization system of Example 1, said method comprising: in the reaction unit, the catalyst raw material and part of the polymerized monomer first enter the continuous prepolymerization reactor, and then enter the liquid phase loop reactor group , and then enter the horizontal gas-phase stirred reactor group for polymerization to obtain crude polyolefin products. The specific method is as follows:

[0065] S1. Into the 20L catalyst preparation system, add a mixture of white oil and liquid paraffin in an equal volume ratio of 14L, keep stirring at 70°C for 120min under vacuum, then add 10mL, 1mol / L triethylaluminum hexane solution , after continuing to stir for 30min, add 700g Mer-01A polypropylene special catalyst again, stir for 60min, pass jacket cooling water, the temperature in the catalyst configuration system is down to room temperature, then through a set of automatically controlled catalyst feed pump (c...

Embodiment 3

[0072] This embodiment provides an olefin polymerization system, specifically as figure 2 As shown, compared with Example 1, the difference is that the liquid phase loop reactor R1 is connected in parallel with the liquid phase loop reactor R2, and the liquid phase loop reactor R1 is connected to the liquid phase loop reactor R1. The outlets of the loop reactor R2 are all connected to a high-pressure flash evaporator.

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Abstract

The invention discloses a multi-reactor olefin polymerization system composed of a liquid-phase loop pipe and a horizontal gas phase and a polymerization method. A multi-reactor polymerization processincluding continuous pre-polymerization, liquid-phase body loop pipe polymerization and horizontal gas-phase stirring polymerization is adopted; at least six modes of polymerization reactor combination can be realized; therefore, the particle form of the polymer is remarkably improved, and the introduction amount of intermittent prepolymerization hexane along with the catalyst and the fine powdercontent of the polymer are reduced; meanwhile, the wall sticking phenomenon in the operation process of the polymerization reactor is reduced; the rubber phase content of the polymer is improved; theheat and mass transfer efficiency of the polymerization reactor is greatly improved, the occupied area of the polymerization reactor is reduced, and the addition amount of hydrogen is increased, so that the melt index of homo-polypropylene is remarkably improved, and particularly, ternary polypropylene random copolymer with lower heat-seal temperature and block polypropylene copolymer products with higher impact strength can be obtained. And the device is low in comprehensive investment cost, flexible in grade switch-over and high in operation efficiency.

Description

technical field [0001] The invention belongs to the technical field of olefin polymerization, and in particular relates to a multi-reactor olefin polymerization system composed of a liquid phase loop pipe and a horizontal gas phase and an olefin polymerization method using the system. Background technique [0002] The polyolefin industry is a pillar industry of the national economy. The development of the polyolefin industry leads the technological progress of industries such as traditional petrochemical industry, modern coal chemical industry, light hydrocarbon lightening and shale gas development, and determines the benefit growth and sustainability of the above industries. develop! Taking polypropylene as an example, at the end of 2019, the production capacity of polypropylene equipment that has been built and put into operation in my country has reached 23.72 million tons / year. In the same period, the apparent consumption of polypropylene in my country has reached 28.58 ...

Claims

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Application Information

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IPC IPC(8): C08F10/00C08F2/01C08F210/06C08F110/06
CPCC08F10/00C08F210/06C08F110/06C08F2/01
Inventor 刘宏祥
Owner 迈瑞尔实验设备(上海)有限公司