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High-pressure polymerization process of ethylenically unsaturated monomers in polymerization reactor

A polymerization reactor and high-pressure polymerization technology, applied in chemical instruments and methods, chemical/physical/physicochemical fixed reactors, methods for chemically changing substances using atmospheric pressure, etc., can solve time-consuming and low-yield problems And other issues

Active Publication Date: 2021-07-23
BASELL POLYOLEFINE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such operations are time-consuming and often also result in a decrease in yield during the initial start-up phase, which is believed to be caused by oxygen ingress during purging with nitrogen.
Oxygen contamination can also lead to some unwanted properties such as gelling, broader molecular weight distribution and reactor fouling

Method used

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  • High-pressure polymerization process of ethylenically unsaturated monomers in polymerization reactor
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Embodiment Construction

[0067] The process of the present invention relates to a process for polymerizing ethylene and optionally one or more comonomers to obtain ethylene-based polymers in a high-pressure polymerization system which allows to significantly reduce the duration of reactor shutdown. Therefore, the effective operating time of an apparatus for polymerization or copolymerization of ethylenically unsaturated monomers can be significantly increased.

[0068] It should be understood that the use of "and / or" is defined inclusively such that the term "a and / or b" should be understood to include the following groups: "a and b", "a or b", "a", "b". Preferably, "and" in most cases "a and / or b" refer to two entities "a" and "b", wherein at least one of said entities is present in said embodiment.

[0069] It should be noted that the terms "above" and "top" refer to the arrangement of elements in the high pressure polymerization system, as assembled and as used and according to the gravity of the e...

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Abstract

A process for polymerizing ethylene in a high-pressure polymerization system comprising a continuously operated polymerization reactor and a reactor blow down system comprising an emergency valve, a reactor blow down vessel containing an aqueous medium and a reactor blow down dump vessel, wherein the process comprises monitoring the polymerization system with respect to an occurrence of a disturbance, opening the emergency valve in case of a disturbance to allow the content of the polymerization system to expand into the reactor blow down vessel, contacting content in the reactor blow down vessel with the aqueous medium to obtain an aqueous polymer slurry, separating the polymer slurry and gaseous components and transferring the polymer slurry to the reactor blow down dump vessel.

Description

technical field [0001] The present invention relates to a process for polymerizing or copolymerizing ethylenically unsaturated monomers to obtain ethylene-based polymers in a high pressure polymerization system comprising a continuously operating polymerization reactor. Background technique [0002] Polyethylene is the most widely used commercial polymer. It can be prepared in several different ways. Polymerization under elevated pressure in the presence of free radical initiators was the first discovered method to obtain polyethylene and is still a valuable method with high commercial relevance for the preparation of low density polyethylene (LDPE). [0003] A typical set-up of plants for the production of low-density polyethylene also includes other equipment besides the polymerization reactor, which may be an autoclave or a tubular reactor or a combination of these reactors. To pressurize the reaction components, a set of two compressors is usually used, a primary compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/01C08F2/02C08F10/02B01J19/24B01J8/00
CPCC08F2/01C08F2/02C08F10/02B01J3/03B01J8/003B01J2219/00123B01J2219/00162B01J2219/00245C08F2400/04B01J3/002B01J3/02B01J19/002B01J19/2415B01J2219/00033B01J2219/0027
Inventor D·利特曼A-A·菲内特C·沃尔夫M·多伊埃灵J·莫尔布特D·海鲁林G·梅伊E·诺伊曼
Owner BASELL POLYOLEFINE GMBH
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