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Multi - stage membrane separation process

A technology for logistics and pollutants, used in separation methods, dispersed particle separation, chemical instruments and methods, etc.

Inactive Publication Date: 2010-12-08
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to date no methods have been developed for the rapid and easy removal of these compounds from natural gas streams containing large amounts of acidic pollutants

Method used

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  • Multi - stage membrane separation process
  • Multi - stage membrane separation process
  • Multi - stage membrane separation process

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Embodiment Construction

[0014] The process of the present invention separates a hydrocarbon stream containing acidic contaminants, particularly a natural gas stream, into two relatively pure streams, a hydrocarbon stream and a stream containing acidic contaminants. The method uses relatively inexpensive membranes. When compared to conventional treatment methods such as amine absorption including regeneration, the membrane unit requires a relatively small operating area, requires a small amount of energy and requires only a small amount of operational effort. Furthermore, the requirements for maintenance and inspection are modest.

[0015] The feed stream to the process of the invention will have a pressure of 30-120 bara. In particular, the pressure of the feed stream is 40-100 bara, preferably 50-90 bara. Suitably, the temperature of the feed stream is from -30 to 120°C, suitably from -20 to 100°C, preferably from 0 to 50°C.

[0016] Acidic pollutants in the feed stream are especially carbon diox...

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Abstract

The invention concerns a process for the removal of gaseous acidic contaminants, especially carbon dioxide and / or hydrogen sulphide, in two or more stages from a gaseous hydrocarbonaceous feedstream (1) comprising hydrocarbons and said acidic contaminants, [mu]sing one or more membranes in each separation stages. The gaseous hydrocarbonaceous feedstream is especially a natural gas stream. The process is especially suitable for feedstreams comprising high amounts of acidic contaminants, e.g. between 10 and 95 vol. % of carbon dioxide and / or hydrogen sulphide, especially between 15 and 70 vol. %. In a first stage (2) a clean or almost clean hydrocarbon stream (3) is separated from the feedstream, the hydrocarbon stream suitably containing less than 5 vol% of acidic contaminants. The remaining stream (4) comprises the acidic contaminants and a certain amount of hydrocarbons. In a second stage (6) a pure or almost pure stream of acidic contaminants (8) is separated from the remaining stream (7), where after the then remaining stream is combined with the feed for the first stage (1), the acidic contaminants stream suitably containing less than 5 vol% of hydrocarbons.

Description

technical field [0001] The present invention involves removal in two or more stages from gaseous hydrocarbon feed streams containing hydrocarbons and gaseous acidic pollutants, particularly carbon dioxide and / or hydrogen sulfide, using one or more membranes in each separation stage The method of acid pollutants. Background technique [0002] Natural gas is the main energy source. Its importance has grown over the past few decades and is expected to grow even further in the coming decades. A major concern in natural gas production is the presence of acidic contaminants. Many natural gas fields are known to contain several percent acid contamination, and many gas fields are known to contain significant amounts of acid contamination such as 10-50 vol% or sometimes even more such as up to 90 vol%. Typically, the presence of several volume percents of carbon dioxide and / or hydrogen sulfide will not cause major problems, since conventional techniques are known for removing thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D61/36C10L3/10
CPCY02C10/10B01D2317/022B01D2257/306B01D2257/504B01D53/225B01D2257/308B01D2317/025C10L3/12B01D2256/24C10L3/102B01D2257/304C10L3/10Y02C20/40
Inventor Z·迪亚兹H·A·吉尔斯E·M·梵贾尔瓦德A·奈迈耶E·J·普伊克
Owner SHELL INT RES MAATSCHAPPIJ BV