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Separator and process for separating volatile compounds from a polymer solution

A separator and polymer technology, applied in the field of separators, can solve the problems that the reaction mixture cannot be separated, keep the liquid level low, increase the efficiency of the separator, etc.

Inactive Publication Date: 2021-07-23
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When dealing with viscous reaction mixtures with flash separators, the problem arises that the high mass transfer resistance caused by the high viscosity of the reaction mixture or solution requires a further increase in separator efficiency
However, such a process layout may still have the problem that for some applications the reaction mixture as explained above cannot be separated to an acceptable degree
However, this solution has the disadvantage that the gas flow entrains too small droplets, which again leads to a reduction in the separation efficiency
However, this method has the disadvantage that a larger flash separator needs to be utilized to ensure that the liquid level is kept as low as possible to minimize entrainment of liquid material
However, it is challenging to separate macromolecules such as comonomers, typical examples of which are 1-octene and vinyl acrylate, from viscous reaction mixtures, especially olefin copolymer melts or solutions

Method used

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  • Separator and process for separating volatile compounds from a polymer solution
  • Separator and process for separating volatile compounds from a polymer solution
  • Separator and process for separating volatile compounds from a polymer solution

Examples

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preparation example Construction

[0072] Preparation of the reaction mixture

[0073] Preferably, the production method comprises a high pressure polymerization process or a solution polymerization process. Most preferably, the production method comprises a solution polymerization process.

[0074] In a preferred embodiment of the present invention, the polymer produced by the production method of the present invention is an olefin polymer, preferably an olefin copolymer, and most preferably an alpha-olefin copolymer. In another preferred embodiment of the invention, the polymer produced by the process of the invention is low density polyethylene.

[0075] high pressure polymerization process

[0076] The polymers, preferably olefin copolymers, can be prepared in a high pressure polymerization process in which an olefin, usually ethylene, is polymerized or copolymerized by a free radical polymerization process. The process includes primary and high pressure compressors, a preheater and a polymerization re...

example 1

[0133] In this example, the same flash separation as in Reference Example 1 has been performed. However, the bottoms stream (the first outlet stream, which is the polymer-rich stream taken from the flash separator) is taken by the melt pump, then directed through a filter, and the polymer is removed to form the first separate stream and a second separate stream. This first split stream is heated to 275°C and reintroduced to the flash vessel.

[0134] It should be noted that as the polymer concentration in the first separated stream decreases, the phase separation temperature of the components of the first separated stream shifts towards higher values. This enables heating of the first separated stream to a higher temperature, which enhances the separation in the flash separator.

[0135] as in image 3 As can be seen in , the amount of the first separation stream, which is part of the bottom stream (first outlet stream) of the flash separator and is reintroduced into the fl...

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PUM

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Abstract

The present invention is concerned with a separator comprising a vessel, a first inlet, a second inlet, a first outlet, a second outlet, and a separation device located downstream of the first outlet, wherein the separation device comprises two outlets, whereas one outlet of the separation device is fluidly connected to the second inlet of the vessel. Furthermore, the present invention is also concerned with a process for separating hydrocarbons from a reaction solution comprising a polymer and said hydrocarbons, comprising the steps of passing the reaction solution through the first inlet into the separator according to the invention, withdrawing a first outlet stream through the first outlet, withdrawing a second outlet stream through the second outlet, separating the first outlet stream in the separation device to produce a first separated stream and a second separated stream, withdrawing the first separated stream from the separation device and passing the first separated stream through the second inlet into the vessel, and withdrawing the second separated stream from the separation device.

Description

[0001] The invention relates to a separator for separating volatile compounds from polymers. Furthermore, the invention relates to a method for separating volatile compounds from polymers using said separator. In particular, the separator and method can be used in solution polymerization processes or high pressure polymerization processes. Background technique [0002] Polyolefins are produced by several different conventional techniques. Typical temperatures range from 50°C to 350°C and pressures vary from 30 bar to 3000 bar. Polyolefins are produced at temperatures at which the polymer dissolves in a liquid or supercritical mixture of unreacted monomer, unreacted comonomer, and optionally solvent. [0003] A polymerization process includes one or more polymerization reactors. Suitable reactors include unstirred or stirred, spherical, cylindrical, and box-like vessels, as well as recirculating loop reactors and tubular reactors. Such reactors typically include injection p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/06B01D3/14C08F2/06C08F6/06C08F6/10C08F6/00
CPCC08F6/003B01D3/06B01D3/143Y02P20/54C08F210/02
Inventor M·A·阿勒-哈吉M·萨塔尔
Owner BOREALIS AG