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Process that utilizes combined distillation and membrane separation in the separation of an acidic contaminant from a light hydrocarbon gas stream

A technology for pollutants and logistics, applied in distillation separation, separation methods, semi-permeable membrane separation, etc., can solve the problems of low hydrocarbon purity and not particularly pure logistics

Active Publication Date: 2012-04-25
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The '430 patent states that the carbon dioxide and hydrocarbon product streams produced by its process are not particularly pure, but that the hydrocarbons are less than 85% pure

Method used

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  • Process that utilizes combined distillation and membrane separation in the separation of an acidic contaminant from a light hydrocarbon gas stream
  • Process that utilizes combined distillation and membrane separation in the separation of an acidic contaminant from a light hydrocarbon gas stream
  • Process that utilizes combined distillation and membrane separation in the separation of an acidic contaminant from a light hydrocarbon gas stream

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Embodiment Construction

[0010] The invention processes the high-pressure light hydrocarbon gas stream polluted by high-concentration acid pollutants to obtain a high-purity light hydrocarbon gas product stream and a liquid acid product stream with highly concentrated acid pollutants. The method of the invention is particularly useful for treating produced natural gas contaminated with unacceptably high concentrations of acidic contaminants. Thus the feed stream to the process of the present invention may contain light hydrocarbons and acidic contaminants.

[0011] In the natural gas stream envisaged to be treated as the feed stream to the process of the present invention, the light hydrocarbons are generally low molecular weight alkanes molecules such as methane, ethane, propane, butane and pentane, but the low molecular weight alkanes present predominantly therein are selected Those from methane and ethane. More typically, however, the hydrocarbon portion of the feedstream is predominantly methane....

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PUM

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Abstract

Disclosed is a process for separating an acidic contaminant and light hydrocarbon of a light hydrocarbon feed having a large contaminating acidic contaminant content. Among other features, the process uses a combination of distillation and membrane separation arranged in a unique way to yield a high-purity light hydrocarbon product and a high-purity acidic contaminant product.

Description

technical field [0001] The present invention relates to a process for separating acidic contaminants from a light hydrocarbon gas stream to provide a high purity hydrocarbon product and an acidic stream product highly concentrated in acidic contaminants. The method uses a combination of fractional distillation and membrane separation. Background technique [0002] There are a variety of hydrocarbon gas sources containing high concentrations of carbon dioxide (CO 2 ) and other acidic pollutants such as hydrogen sulfide (H 2 S) and carbonyl sulfide (COS), making gases from these sources unsuitable, for example, for introduction into pipelines for sale and transport to end users. Among these sources, gases from natural gas reservoirs may have such high concentrations of acid contaminants that conventional methods of removing acid contaminants are not economical or even technically feasible, thus rendering these reservoirs unproducible. [0003] In the prior art, various proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/40B01D53/22B01D61/00B01D3/00
CPCF25J3/0209Y02C10/12B01D2257/308B01D2256/24B01D3/145F25J2230/60F25J2205/40B01D53/229F25J2240/02F25J2220/66C10L3/102B01D53/226F25J2200/02B01D2258/06F25J2270/90B01D2257/304F25J2205/80C10L3/10B01D3/143F25J2205/04Y02C10/10F25J2200/74B01D2257/504F25J2200/40F25J3/0233F25J3/0266Y02C20/40Y02P70/10
Inventor Z·迪亚兹S·舒P·J·威廉姆斯
Owner SHELL INT RES MAATSCHAPPIJ BV
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