A method of recovering olefins in a solution polymerisation process

A solution and polymer technology, applied in separation methods, chemical instruments and methods, chemical liquid solidification, etc., can solve problems such as difficult control of polymer density

Active Publication Date: 2020-09-22
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer density control becomes difficult if inert components are not removed

Method used

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  • A method of recovering olefins in a solution polymerisation process

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Experimental program
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Embodiment

[0066] Computer simulations were performed using Aspen 8.8 computer software. In the simulation, ethylene and 1-hexene were polymerized in n-octane in a polymerization reactor. A product stream is withdrawn from the polymerization reactor. The product stream undergoes three subsequent flash steps. A portion of the vapor stream from each flash step is directed to the first fractionator. The overhead stream from the first fractionator is sent to the second fractionator. The overhead stream from the second fractionator is sent to the third fractionator. In an embodiment of the invention, a portion of the bottoms stream from the third fractionator is recovered as a sweep stream from line 40 . In the comparative example, a portion of the overhead stream from the first fractionator was recovered as a sweep stream from line 36 . Table 1 compares the purge flow at different locations.

[0067] Table 1

[0068] purge flow CE IE Total mass flow(kg / h) 176.8 17...

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Abstract

The present invention relates to a process for removing hydrocarbons comprising the steps of: (A) passing a stream of a solution into a separator wherein a liquid phase comprising polymer and a vapourphase coexist; (B) withdrawing a vapour stream and a concentrated solution stream from the separator; (C) passing at least a part of the vapour stream into a first fractionator; (D) withdrawing a first overhead stream and a first bottom stream from the first fractionator; (E) passing the first overhead stream to a second fractionator; (F) withdrawing a second overhead stream and a second bottom stream from the second fractionator; (G) passing the second overhead stream to a third fractionator; (H) withdrawing a third overhead stream and a third bottom stream from the third fractionator; characterised in that at least a part of the third bottom stream is withdrawn as a purge stream.

Description

technical field [0001] The present invention relates to a solution polymerization process. More specifically, the present invention relates to the separation and removal of inert components in reaction mixtures downstream of the polymerization process. Background technique [0002] It is known to produce olefin polymers in a solution polymerization process in which unreacted monomer and comonomer and solvent are separated from solution and recycled to the polymerization process. [0003] WO-A-2009 / 013217 discloses a method for separating a hydrocarbon-containing feed stream downstream of an olefin polymerization process. The separation of olefin monomers, comonomers and hydrocarbon diluents is described. [0004] WO-A-2009 / 090254 discloses a method for recovering unreacted monomer from a slurry or gas phase polymerization process. [0005] Despite said prior art, there is still a need for an efficient method of separating and recovering comonomer-derived inert components ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/06C08F6/00
CPCC08F2/06C08F6/003C08L23/0815C08F10/00C08F2/01C08F10/02B01D3/143B01J19/06C08F6/005C08F6/04C08F210/16
Inventor 穆罕默德·哈吉·阿里埃里克·埃里克松古汉·马蒂瓦南尤卡·雷塞宁亨利·苏莱施特萨梅尔·维贾伊塞缪尔·西廷
Owner BOREALIS AG
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