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Device for producing low-density polyethylene

A low-density polyethylene and ethylene technology, which is applied in the field of high-pressure reactors, can solve problems such as the influence of chemical reaction processes, and achieve the effects of increasing the polymerization rate of branched long chains, improving the degree of branching of long chains and their performance

Inactive Publication Date: 2015-07-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The zoning phenomenon and back-mixing phenomenon caused by the multi-layer stirring structure in the LDPE tank reactor form non-ideal flow, which will have a great impact on the chemical reaction process

Method used

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  • Device for producing low-density polyethylene
  • Device for producing low-density polyethylene
  • Device for producing low-density polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] exist figure 1 A plant for the production of low density polyethylene is shown producing coating grade low density polyethylene. Such as figure 2 As shown, there is a straight blade turbine blade and a baffle in the tank reactor 3, which are located at 1 / 2 of the height of the tank reactor, forming two reaction zones, and there are 15 double blades in each reaction zone. Pitch paddles, and an anchor paddle at the end of the lowest reaction zone.

[0067] The reaction raw material ethylene is boosted to 30MPa through the first compressor 1, mixed with the recycled ethylene from the oligomer separator 8, and then enters the second compressor 2 to boost the reaction pressure to 300MPa, and the ethylene coming out of the second compressor 2 is divided into Four streams are introduced into the reactor at the upper part 12, the middle part 13 and the lower part 14 of the reactor top 11 and the reactor side respectively, and the free radical initiator di-tert-butyl peroxide...

Embodiment 2

[0070] exist figure 1 A plant for the production of low density polyethylene is shown producing coating grade low density polyethylene. Such as figure 2 As shown, there are two straight blade turbine blades and two baffles in the tank reactor 3, which are located at 1 / 3 and 2 / 3 of the height of the tank reactor, forming three reaction zones, and in each reaction zone There are also 10 two-bladed pitched propellers and an anchored propeller at the end of the lowest reaction zone.

[0071] The reaction raw material ethylene is boosted to 30MPa through the first compressor 1, mixed with the recycled ethylene from the oligomer separator 8, and then enters the second compressor 2 to boost the reaction pressure to 300MPa, and the ethylene coming out of the second compressor 2 is divided into Four streams are introduced into the reactor at the upper part 12, the middle part 13 and the lower part 14 of the reactor top 11 and the reactor side respectively, and the free radical initi...

Embodiment 3

[0074] exist figure 1 A plant for the production of low density polyethylene is shown producing coating grade low density polyethylene. Such as figure 2 As shown, there are three straight-bladed turbine paddles and three baffles in the tank reactor 3, which are located at 1 / 4, 2 / 4 and 3 / 4 of the height of the tank reactor, forming four reaction zones. There are also 8 two-bladed pitched paddles in the reaction zone, and an anchored paddle at the end of the lowest reaction zone.

[0075] The reaction raw material ethylene is boosted to 30MPa through the first compressor 1, mixed with the recycled ethylene from the oligomer separator 8, and then enters the second compressor 2 to boost the reaction pressure to 300MPa, and the ethylene coming out of the second compressor 2 is divided into Four streams are introduced into the reactor at the upper part 12, the middle part 13 and the lower part 14 of the reactor top 11 and the reactor side respectively, and the free radical initia...

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Abstract

The invention discloses a device for producing low-density polyethylene. The device is a high-pressure reactor; two or more reaction kettle divisions are formed in the high-pressure reactor according to different types and quantities of stirring paddles; through the adoption of the high-pressure reactor, low-density polyethylene which is high in long-chain branching degree can be obtained for preparation of a higher-performance polyethylene product. Particularly, straight-blade turbine paddles and baffles can be utilized for the high-pressure reactor, that is, through the arrangement of a plurality of the straight-blade turbine paddles and baffles in the high-pressure reactor, a plurality of the reaction kettle divisions are formed, so that the reaction system micro-mixing in such reaction kettle divisions is strengthened, the long-chain branching reaction rate is increased, and high-performance long-chain low-density polyethylene suitable for coating is obtained.

Description

technical field [0001] The invention relates to a high-pressure reactor for producing low-density polyethylene, in particular to a method for producing low-density polyethylene by using a tank reactor under high temperature and high pressure conditions. The difference in the number forms a stirring structure of multiple reactor zones to prepare low-density polyethylene with a high degree of long-chain branching. Background technique [0002] Low-density polyethylene (LDPE) has a branched chain structure, low melting point, wide molecular weight distribution, strong melt strength, and has excellent film processing performance and good blending performance. and other fields are widely used. LDPE can be used alone, blended or coextruded in a variety of packaging, construction, agricultural, industrial and consumer applications. [0003] When producing LDPE, ethylene is usually polymerized in a tubular reactor or a tank reactor at a temperature exceeding 100 degrees Celsius an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F2/01C08L23/06
Inventor 黄正梁陈毓明廖祖维王靖岱蒋斌波阳永荣郑海俊范小强陈美胡东芳屠高女
Owner ZHEJIANG UNIV