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Method of recovering unreacted ethylene in ethylene oligomerization process

A technology of ethylene oligomerization and unreaction, which is applied in separation methods, chemical recovery, chemical instruments and methods, etc. It can solve the problems of high operating cost and insignificant difference in boiling point, and achieve the effect of improving the recovery rate

Pending Publication Date: 2022-02-15
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the circulation is performed by the above method, since the difference in boiling point between the adduct having a boiling point lower than ethylene and ethylene is not significant, a distillation column having several tens of stages is required, and the running cost is high

Method used

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  • Method of recovering unreacted ethylene in ethylene oligomerization process
  • Method of recovering unreacted ethylene in ethylene oligomerization process
  • Method of recovering unreacted ethylene in ethylene oligomerization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] Pressure and temperature were adjusted as shown in Table 1 below, and simulated using Aspen plus V8.6 (AspenTech).

[0156] Such as figure 2 As shown, the ethylene oligomerization reaction unit including the ethylene recovery process was designed. The reactants exiting the ethylene oligomerization reactor at 60°C and 60 bar included 9% by weight of unreacted ethylene, 1% by weight of methane, 22% by weight of C4 or higher olefins, 68% by weight of methane Cyclohexane.

[0157] The reactants were transferred to a heat exchanger and cooled to 5 °C, the cooled reactants were transferred to a distillation column as a second separation unit, and the first recovery stream comprising unreacted ethylene and methane was obtained from The upper layer of the distillation column flows out, while methylcyclohexane and C4 or higher olefins are separated in the lower layer. At this time, the pressure of the distillation column was 20 bar, and the temperature of the upper layer was...

Embodiment 2 and Embodiment 3

[0162] As shown in Table 1 below, ethylene oligomerization was performed in the same manner as in Example 1 except that the operating conditions of the first separation device were changed according to the composition of the first recovered stream. The results are shown in Table 2 below.

[0163] [Table 1]

[0164]

[0165] [Table 2]

[0166]

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Abstract

Provided is a method of recovering unreacted ethylene in an ethylene oligomerization process and reusing the ethylene as a raw material, and more particularly, to a method of recovering unreacted ethylene with an increased recovery rate of reuse. When the method of the present invention is used, most of unreacted ethylene may be dissolved in a solvent to be recovered without loss, and a low boiling point reaction product which is not dissolved in the solvent is removed to prevent an unreacted product from being concentrated in a reactor.

Description

technical field [0001] The present invention relates to a method for recovering unreacted ethylene in an ethylene oligomerization process and reusing ethylene as a raw material, more particularly, to a method for recovering unreacted ethylene with an increased recovery rate for recycling method. Background technique [0002] 1-Hexene or 1-octene is an important commercial feedstock widely used in polymerization processes as a monomer or comonomer for the preparation of linear low density polyethylene and purified by products resulting from the oligomerization of ethylene get. [0003] The reactor effluent from the ethylene oligomerization reaction includes unreacted ethylene as well as 1-hexene and 1-octene, and in order to increase the overall reaction yield, the separation of unreacted ethylene from the reactor effluent is included. ethylene and return it to the reactor. [0004] Usually, such as image 3 As shown, the reactor effluent is transferred to a gas-liquid sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C11/04C07C2/08B01J19/00
CPCC07C7/04C07C11/04C07C2/08B01J19/0046B01J19/0053B01J2219/00452C07C11/02Y02P20/582B01D3/06B01D3/143
Inventor 朴赞宪方填皖孙成烈宋寅浃郑宇城韩嵲
Owner SK INNOVATION CO LTD