Stirring structure for reinforcing olefin polymerization and method for reinforcing olefin polymerization

An olefin polymerization and agitator technology, which is applied in the field of strengthening olefin polymerization and strengthening the stirring structure of olefin polymerization, can solve the problems of uneven mass transfer and heat transfer, low conversion rate, low stirring efficiency, etc., so as to improve the convective heat transfer efficiency and promote the The effect of uniform mixing and improving heat exchange efficiency

Inactive Publication Date: 2019-01-25
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a stirring structure for strengthening olefin polymerization and a method for strengthening olefin polymerization in order to solve the above problems, so as to solve the problems of uneven mass transfer and heat transfer and low conversion rate of materials in each stage of the current olefin polymerization reaction process , to achieve the purpose of improving the polymerization efficiency
Using coaxial inner and outer double-layer agitators, by adjusting the speed and rotation direction of the inner and outer agitators at different stages of olefin polymerization reaction, it can solve the change of material viscosity, solid content, density, polymer particle size and other states in the process of olefin polymerization The problem of reduced stirring efficiency can prevent the problems of olefin detonation and catalyst deactivation caused by insufficient stirring, and can also prevent the problem of energy waste caused by excessive stirring, and finally achieve the purpose of strengthening olefin polymerization.

Method used

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  • Stirring structure for reinforcing olefin polymerization and method for reinforcing olefin polymerization
  • Stirring structure for reinforcing olefin polymerization and method for reinforcing olefin polymerization
  • Stirring structure for reinforcing olefin polymerization and method for reinforcing olefin polymerization

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for strengthening batch type propylene slurry polymerization, such as figure 1 , including: the reaction kettle body 1 is a 5L vertical kettle body, the inner paddle 2 is an anchor paddle, and the outer layer paddle 3 is a frame paddle. The diameter of the kettle body is 144mm, the outer diameter of the inner paddle is 100mm, the layer spacing is 60mm, the inner diameter of the outer paddle is 110mm, and the outer diameter of the outer paddle is 135mm. The catalyst adopts a metallocene catalyst with a Zr content of 0.36%, the auxiliary agent is triisobutylaluminum, and Al / Zr=220 is controlled. First, open the outer paddle, adjust the rotation speed to 100r / min, and pass 2kg of liquid propylene, 200mg of hydrogen, 100mg of catalyst and a certain amount of triisobutylaluminum into the reaction device, and carry out prepolymerization at 40°C and 2MPa. 15min. After the pre-polymerization is completed, turn on the inner paddle, adjust the rotation speed to 100r / mi...

Embodiment 2

[0031]Change the reactor body in Example 1 into a 10L horizontal kettle body, the diameter of the kettle body is 200mm, the inner paddle is changed into four layers of folding blade paddles, the outer diameter of the inner layer paddle is 110mm, the interlayer distance is 60mm, and the outer layer paddle Inner diameter is 150mm, outer diameter of outer paddle is 180mm, 2kg liquid propylene, 200mg hydrogen, 100mg catalyst Zr content 0.36% change 4kg liquid propylene, 400mg hydrogen, 200mg catalyzer, others are identical with embodiment 1. The polypropylene obtained by the reaction is 3.82kg in total. The polypropylene particle size distribution obtained by the method is uniform, the particle size distribution D90-D10 / D50=1.88, and the fine powder produced is less, and the fine powder rate less than 200 mesh is 1.01%.

Embodiment 3

[0035] A method for strengthening batch-type propylene slurry polymerization, comprising: a reaction kettle body is a 5L vertical kettle body, an inner paddle is a three-layer propulsion type paddle, and an outer layer paddle is an anchor type paddle. The diameter of the kettle body is 144mm, the outer diameter of the inner paddle is 100mm, the layer spacing is 90mm, the inner diameter of the outer paddle is 110mm, and the outer diameter of the outer paddle is 135mm. The Ti content of Ziegler-Natta catalyst is 1.51%, the cocatalyst is triethylaluminum, and the external electron donor is dicyclopentyldimethoxysilane, and Al / Zr=220 is controlled. First turn on the inner and outer paddles, adjust the speed of the inner paddle to 100r / min, and the speed of the outer paddle to 150r / min, and the rotation direction of the two is opposite, and mix 2kg of liquid propylene, 200mg of hydrogen, 50mg of catalyst, 2ml of external electron donor and a certain A certain amount of triethylalum...

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Abstract

The invention relates to a stirring structure for reinforcing olefin polymerization and a method for reinforcing olefin polymerization. The stirring structure comprises a reaction kettle body and an inner-outer double-layer stirrer arranged in the reaction kettle body, wherein the inner-outer double-layer stirrer consists of an inner-layer paddle and an outer-layer paddle arranged outside the inner-layer paddle; the inner-layer paddle and the outer-layer paddle are coaxially mounted in the reaction kettle body; the inner-layer paddle and the outer-layer paddle rotate at different speeds and indifferent directions as required. According to the stirring structure provided by the invention, through different combinations of the paddle types of the inner- and outer-layer paddles and by adjusting the speeds and directions of the inner- and outer-layer paddles in the polymerization process, the processes of slurry polymerization, solution polymerization, emulsion polymerization, suspensionpolymerization and gas-phase polymerization are reinforced, the mass transfer and heat transfer are promoted, the product quality is improved while the conversion rate is increased; moreover, the structure of the reaction kettle is not transformed, thus the investment cost on the equipment is saved.

Description

technical field [0001] The invention relates to the technical field of olefin polymerization, in particular to a stirring structure for strengthening olefin polymerization and a method for strengthening olefin polymerization. Background technique [0002] The olefin polymerization process includes various stages in the process of slurry polymerization, solution polymerization, emulsion polymerization, suspension polymerization and gas phase polymerization, which is a kind of complex reaction. The effect of reaction mixing directly affects the quality of the product. Most of the existing olefin polymerization process is to stir the raw materials at a constant speed with a single paddle, so that some stirring misunderstandings, dead angles, sticking to the bottom, and sticking to the wall will inevitably occur during the polymerization process, resulting in difficulties in mass and heat transfer, thus affecting In addition, most of the stirring forms in the existing olefin po...

Claims

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Application Information

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IPC IPC(8): B01J19/18C08F10/00C08F2/01
CPCB01J19/18C08F10/00C08F2/01
Inventor 吴裕凡王修纲曹育才麦永懿叶晓峰
Owner SHANGHAI RES INST OF CHEM IND
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