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Method and apparatus for polymerizing ethylene at ultra-high pressure

An ethylene polymer and pressure technology, applied in chemical instruments and methods, pressure vessels used in chemical processes, mixers, etc., can solve problems such as reducing metal integrity, inspection difficulties, and risk of large thread cracks

Active Publication Date: 2017-04-26
WESTLAKE LONGVIEW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore threading the wall bulkhead to the inner surface of the column by studs or bolts is not considered a viable option as even rolled threads (as opposed to cut threads) pose too much risk of cracking and check difficulty
Similarly, welding a wall bulkhead to the inner surface of a column will reduce the integrity of the quenched and forged metal, making it weaker or harder and more prone to cracking

Method used

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  • Method and apparatus for polymerizing ethylene at ultra-high pressure

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Embodiment Construction

[0013] As used herein, "ethylene polymer" means a polymer prepared by homopolymerizing ethylene or by copolymerizing ethylene having at least one other compound capable of copolymerizing with ethylene. Suitable monomers are thus ethylene and mixtures of ethylene with any other comonomers which can conventionally be copolymerized with ethylene in the presence of free radical initiators under ultrahigh pressure conditions. Examples of such comonomers include acrylic acid and its esters, such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and tert-butyl acrylate, as well as 2-ethylhexyl acrylate and the corresponding methyl Acrylates; vinyl esters, such as vinyl acetate, vinyl propionate and vinyl pivalate; methacrylic acid and its esters; vinyl ethers; vinyl ketones; acrylonitrile; acrylamide; unsaturated hydrocarbons, e.g., Propylene, Butene, or Hexene; Carbon Monoxide; Sulfur Dioxide; and mixtures thereof.

[0014] A particularly useful ethylene poly...

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Abstract

The present invention relates to a method and a plant for the preparation of ethylene polymers by free-radical polymerization at ultra-high pressure. The polymerization is carried out in an autoclave reactor in the presence of a free radical initiator. The autoclave reactor is characterized by having one or more elongated partitions (5) secured to the inner reactor wall (12).

Description

technical field [0001] The present invention relates to a method and a plant for the preparation of ethylene polymers by free-radical polymerization at ultra-high pressure. Background technique [0002] LDPE with polar co-monomer (co-monomer) of ethylene and co-monomer can pass through free base polymerization to produce. These reactions are often carried out in thick-walled autoclave reactors specially designed to withstand extreme operating conditions. [0003] In order to control temperature and polymer concentration, vigorous agitation was required to establish uniformity throughout the reactor. If areas within the reactor are not sufficiently agitated, polymerization in such localized areas can rise above that in the rest of the vessel, and the temperature can rise in those areas to form hot spots and cause runaway decomposition. [0004] To improve mixing, radial impeller agitators have been developed. These mixers performed better than previous generation mixers, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/03B01J3/04B01J19/00B01J19/18C08F2/01C08F110/02C08F10/02
CPCB01J3/03B01J3/04B01J19/006B01J19/18C08F110/02B01J2219/00768B01J2219/00779B01J2219/00777B01J2219/00094B01F35/531C08F2/00C08F2/01C08F2500/08
Inventor B.J.萨尔蒙A.G.万德斯W.S.斯特拉泽
Owner WESTLAKE LONGVIEW
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