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Method for producing polyethylene

A polyethylene and product technology, applied in the field of polyolefin production, can solve problems such as sticking to the wall, achieve the effects of enhanced fluidity, lower material viscosity, and avoid sticking to the wall

Inactive Publication Date: 2018-07-10
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a method for producing polyethylene to solve the problem of wall sticking in the production process of polyethylene in the prior art

Method used

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  • Method for producing polyethylene

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Embodiment 1

[0038] According to the method of the present invention, polyethylene is produced as follows:

[0039] A polyethylene tubular reactor with four reaction zones is used. The ethylene material is preheated by a reaction preheater, so that the temperature of the preheated reaction material reaches 170°C. The pressure of the polyethylene tubular reactor was set at 250MPa.

[0040] The reaction temperature of the first and second reaction zones of the polyethylene tubular reactor is set to 302°C, and the first-stage polymerization reaction is carried out in the first and second reaction zones to obtain the first polymerization product; the third and second The reaction temperature of the four reaction zones is set at 290° C., and the second-stage polymerization reaction is carried out in the third and fourth reaction zones to obtain the polymerization product polyethylene.

[0041] During the polymerization reaction, the heat exchange jacket of the reactor is fed with exchange wat...

Embodiment 2

[0043] Carry out the production of polyethylene according to the method for embodiment 1, difference is, carry out first-stage polymerization reaction at 307 ℃ in the first, second reaction zone, obtain the first polymerization product; In the 3rd, the 4th reaction zone at 285 The second-stage polymerization reaction is carried out at ℃ to obtain the polymerization product polyethylene.

Embodiment 3

[0045] The production of polyethylene was carried out according to the method of Example 1, the difference was that, during the first and second stages of polymerization, with the injection rate of 80g / h, oxygen was introduced into the reactor as a polymerization inhibitor.

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Abstract

The invention provides a method for producing polyethylene. The method comprises the following steps: adding reaction materials into a high-pressure polyethylene reactor; carrying out a first-stage polymerization reaction on the reaction materials at 302-307 DEG C to obtain a first polymerization product; and carrying out a second-stage polymerization reaction on the first polymerization product at 285-290 DEG C to obtain the polymerization product polyethylene. According to the method, the reaction temperatures of the first-stage reaction and the second-stage reaction in a high-pressure polyethylene reaction are adjusted, and the reaction temperatures of the two stages are relatively controlled to be in a range of 302-307 DEG C and in a range of 285-290 DEG C, so that the molecular weightof the polymer obtained in the first-stage reaction is reduced, the viscosity of the materials of the first-stage reaction is reduced, the flowability is enhanced, and thus the occurrence of adhesionto a wall is avoided.

Description

technical field [0001] The invention relates to the field of polyolefin production, more specifically, to a method for producing polyethylene. Background technique [0002] The polymerization reaction in the ethylene high-pressure method is a free radical polymerization reaction, and the reaction process includes chain initiation, chain growth, chain transfer and chain termination. The high-pressure polymerization production process of ethylene can use both tank-type polymerization reactors and tubular polymerization reactors. In the high-pressure polyethylene production process, the pressure is usually controlled at 110-350MPa. [0003] In the tube-type high-pressure low-density polyethylene device, due to the characteristics of the reaction tube type, the type of initiator, and the heat exchange medium, it is easy to produce high-viscosity and poor-fluidity high-molecular-weight materials during the reaction, and the high-viscosity materials are easy to stick to the inner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F2/00C08F2/38C08F2/40C08F2/01
CPCC08F110/02C08F2/001C08F2/00C08F2/38C08F2/40C08F2/01
Inventor 黄起中徐海波马雷孙爱光贺飞张先松邓方文唐明辉廖向东孙浩
Owner CHNA ENERGY INVESTMENT CORP LTD
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