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System and process for enhancing ethylene polymerization

An ethylene polymerization and ethylene technology, applied in the field of polymer preparation, can solve the problems of insufficient mixing between materials and low polymerization efficiency, and achieve the effects of improving mixing efficiency, increasing phase boundary area, and improving polymerization efficiency.

Active Publication Date: 2021-03-16
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the present invention provides a system and process for strengthening ethylene polymerization to overcome the problem of low polymerization efficiency caused by insufficient mixing of materials in the prior art

Method used

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  • System and process for enhancing ethylene polymerization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] The above-mentioned system and the above-mentioned process are used to prepare polyethylene, wherein the catalyst in the step 2 is titanium tetrachloride.

[0093] The viscosity reducing agent in the described step 2 selects n-hexane for use.

[0094] The comonomer in step 3 is selected from short-chain α-olefins.

[0095] In the step 3, oxygen is selected as the initiator, and the initiator content is 0.003% of the ethylene content.

[0096] In the step 5, the polymerization temperature is 230° C., and the reaction pressure is 140 MPa.

[0097] The obtained polyethylene was tested, and it was found that the PDI of the product polyethylene was 1.93, and the conversion rate of ethylene was 93.5%.

Embodiment 2

[0099] The above-mentioned system and the above-mentioned process are used to prepare polyethylene, wherein the catalyst in the step 2 is diethylaluminum chloride.

[0100] The viscosity reducing agent in the described step 2 selects n-hexane for use.

[0101] The comonomer in step 3 is vinyl acetate.

[0102] In the step 3, oxygen is selected as the initiator, and the initiator content is 0.004% of the ethylene content.

[0103] In the step 5, the polymerization temperature is 245° C., and the reaction pressure is 160 MPa.

[0104] The obtained polyethylene was tested, and it was found that the PDI of the product polyethylene was 1.81, and the conversion rate of ethylene was 94.8%.

Embodiment 3

[0106] The above-mentioned system and the above-mentioned process are used to prepare polyethylene, wherein the catalyst in the step 2 is a mixed solvent of titanium tetrachloride and diethylaluminum chloride.

[0107] The viscosity reducing agent in the described step 2 selects n-hexane for use.

[0108] The comonomer in step 3 is selected from acrylate.

[0109] Oxygen is selected as the initiator in the step 3, and the initiator content is 0.006% of the ethylene content.

[0110] In the step 5, the polymerization temperature is 255° C., and the reaction pressure is 180 MPa.

[0111] The obtained polyethylene was detected, and it was found that the PDI of the product polyethylene was 1.55, and the conversion rate of ethylene was 96.7%.

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Abstract

The invention relates to a system and process for enhancing ethylene polymerization. The system comprises a feeding unit, a reaction unit connected with the feeding unit, a micro-interface generator arranged in the feeding unit, and a discharging unit connected with the reaction unit. According to the invention, ethylene is crushed to form micron-scale bubbles, the ethylene micron-scale bubbles are mixed with a solvent to form a gas-liquid emulsion, the thickness of a liquid film is reduced, the mass transfer resistance is reduced, and the initiator is crushed to form the micron-scale micron-scale bubbles, thus the initiator micron-sized bubbles and the gas-liquid emulsion are mixed to form a mixed material, so that the effect of enhancing mass transfer within a relatively low preset operation condition range is achieved; and meanwhile, all the micron-sized bubbles can be fully mixed with a solvent to form a gas-liquid emulsion, ethylene and an initiator in the system can be ensured tobe in full contact with solvent alkene by fully mixing a gas phase and a liquid phase, and the polymerization efficiency of the system is further improved.

Description

technical field [0001] The invention relates to the technical field of polymer preparation, in particular to a system and process for strengthening ethylene polymerization. Background technique [0002] Polyethylene (PE) is the most commonly used plastic polymer in the world, with an annual consumption rate of more than 50 billion pounds per year. More than 70 percent of Porex products use polyethylene. Based on a repeating linear molecular structure – CH2-CH2-, PE is a semi-crystalline polymer whose strength and toughness are enhanced before tensile failure. In general, PE is a strong, lightweight thermoplastic with excellent chemical resistance. Corrosion resistance, excellent electrical insulation (especially high-frequency insulation), can be chlorinated, modified by irradiation, and can be reinforced with glass fiber. Low-pressure polyethylene has high melting point, rigidity, hardness and strength, low water absorption, good electrical properties and radiation resis...

Claims

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Application Information

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IPC IPC(8): C08F10/02C08F210/16C08F210/02C08F218/08C08F220/10C08F2/01B01J10/00B01J4/00B01J4/02B01J19/14
CPCC08F10/02C08F210/16C08F210/02B01J10/002B01J4/008B01J4/02B01J19/14B01J2204/002C08F2/01C08F218/08C08F220/10B01J4/00B01J10/00Y02P20/52
Inventor 张志炳李磊周政张锋孟为民王宝荣杨高东罗华勋杨国强田洪舟曹宇
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD