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Recovery of ethylene by absorption

An ethylene and polyethylene technology, applied in the system field of improving polyethylene production efficiency, can solve the problems of high cost and high energy consumption

Inactive Publication Date: 2017-07-25
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In either case, traditional processes for recycling monomers require energy-intensive and expensive processes

Method used

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  • Recovery of ethylene by absorption
  • Recovery of ethylene by absorption
  • Recovery of ethylene by absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach A

[0128] Embodiment A. A method for recovering ethylene from a polymerization product stream of a polyethylene production system comprising:

[0129] separating a light gas stream from the polymerization product stream, wherein the light gas stream comprises ethane and unreacted ethylene;

[0130] Contacting the light gas stream with an absorption solvent system, wherein contacting the light gas stream with the absorption solvent system occurs at a temperature in the range of about 40°F to about 110°F, wherein from the light gas At least a portion of the unreacted ethylene of the stream is absorbed by the absorption solvent system; and

[0131] Unreacted ethylene is recovered from the absorption solvent system to obtain recovered ethylene.

[0132] Embodiment B. The method of Embodiment A, wherein the absorption solvent system comprises copper chloride, aniline, and N-methylpyrrolidone.

[0133] Embodiment C. The method of Embodiment A, wherein contacting the light gas stream ...

Embodiment approach O

[0147] Embodiment O. A method of producing polyethylene comprising:

[0148] contacting ethylene and a polymerization catalyst under suitable reaction conditions in a polymerization reactor to produce a polymerization product stream;

[0149] separating a light gas stream from the polymerization product stream, wherein the light gas stream comprises unreacted ethylene;

[0150] contacting the light gas stream with an absorption solvent system in an absorption reactor at a temperature in the range of about 40°F to about 110°F, wherein at least a portion of the unreacted ethylene from the light gas stream absorbed by the absorption solvent system to produce a composition comprising a complex of the absorption solvent system and unreacted ethylene;

[0151] removing unabsorbed gas of said light gas stream from contact with said absorption solvent system;

[0152] recovering unreacted ethylene from the absorption solvent system; and

[0153] The recovered ethylene is contacted ...

Embodiment approach W

[0167] Embodiment W. A polyethylene production system comprising:

[0168] a feed stream comprising ethylene, wherein the feed stream is characterized as being introduced into the polymerization reactor;

[0169] a polymerization product stream, wherein the polymerization product stream is characterized by being discharged from the polymerization reactor and introduced into a separator;

[0170] A light gas stream comprising unreacted ethylene, wherein the light gas stream is characterized by being discharged from the separator, the light gas stream having been separated from the polymerization product stream, wherein the light gas stream is characterized by being introduced into into an absorption solvent system, wherein said absorption solvent system has a temperature in the range of about 40°F to about 110°F;

[0171] an absorbent-ethylene conjugate, wherein the absorbent-ethylene conjugate is characterized by being formed within the absorption solvent system by absorbing ...

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Abstract

A method of recovering ethylene from a polymerization product stream of a polyethylene production system, comprising separating a light gas stream from said polymerization product stream, wherein said light gas stream comprises ethane and unreacted ethylene, and combining the light gas stream with an absorption solvent system contacting, wherein contacting the light gas stream with an absorption solvent system occurs at a temperature in the range of about 40°F to about 110°F, wherein at least a portion of the unreacted ethylene from the light gas stream is absorbed by the absorption solvent system, and recovering unreacted ethylene from the absorption solvent system to obtain recovered ethylene.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application Serial No. 12 / 905,966, entitled "Improved Ethylene Separation," filed October 15, 2010, which is hereby incorporated by reference herein in its entirety for for all purposes. [0003] background technical field [0004] The present disclosure generally relates to the production of polyethylene. More specifically, the present disclosure relates to systems and methods for increasing polyethylene production efficiency by reducing ethylene loss. Background technique [0005] Production of polymers such as polyethylene from light gases requires high purity monomer and comonomer feedstocks. Due to the small difference in boiling points between the light gases in this feedstock, industrial production of high purity feedstock requires the operation of multiple distillation columns, high pressures, and low temperatures. Thus, the energy costs associated w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00C08F6/00C08F10/02
CPCB01D53/1418B01D53/1493B01D2252/20421B01D2252/20468B01D2252/604B01D2256/24C08F6/001C08F110/02C08J11/02C08J2323/06
Inventor J·D·浩托威章艾茀
Owner CHEVRON PHILLIPS CHEMICAL CO LP