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Removing Contaminants from Natural Gas

a technology of natural gas and contaminant, which is applied in the direction of gaseous fuels, water/sludge/sewage treatment, rectification and condensation, etc., can solve the problems of premature failure of such systems, high cost, and high cost of existing dehydration and gas sweetening processes

Inactive Publication Date: 2010-02-04
WOODSIDE ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

H2S is a contaminant of natural gas that must be removed to satisfy legal requirements, as H2S and its combustion products of sulphur dioxide and sulphur trioxide are also toxic.
Furthermore, H2S is corrosive to most metals normally associated with gas pipelines so that processing and handling of a sour gas may lead to premature failure of such systems.
Existing dehydration and gas sweetening processes are extremely complex and expensive.

Method used

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  • Removing Contaminants from Natural Gas
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  • Removing Contaminants from Natural Gas

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Embodiment Construction

[0012]The present invention represents an improvement on the process and device discussed in International patent application publication No. 03 / 062 725.

[0013]Contaminants from a natural gas feed stream is removed by forming a solid of the contaminant and suitably subsequently melting the solid contaminant.

[0014]When the contaminant is water, one embodiment of the present invention relates to a process for dehydrating a natural gas feed stream.

[0015]When the contaminant is a sour species, for example hydrogen sulphide or carbon dioxide, one embodiment of the present invention relates to a process for sweetening the natural gas feed stream.

[0016]In another embodiment of the present invention relates to a process for sequentially dehydrating and sweetening the natural gas feed stream.

[0017]To this end the process for removing contaminants from a natural gas feed stream including water according to the present invention comprises the steps of cooling the natural gas feed stream in a fi...

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Abstract

A process is described for removing contaminants from a natural gas feed stream including water. The process includes the steps of cooling the natural gas feed stream in a first vessel to a first operating temperature at which hydrates are formed, heating the hydrates to a temperature that is above the first operating temperature by introducing a warm liquid to the first vessel so as to melt the hydrates and liberate a dehydrated gas and a water-containing liquid, and removing from the first vessel a stream of dehydrated gas.

Description

RELATED APPLICATIONS[0001]This application claims priority to co-pending U.S. patent application Ser. No. 10 / 772,621, filed Feb. 5, 2004, which claims priority to Australian patent application having serial number 2003900534, filed Feb. 7, 2003. Co-pending U.S. application Ser. No. 10 / 772,621 is herein incorporated by reference in its entirety.FIELD OF INVENTION[0002]The present invention relates to a process for removing a contaminant from a natural gas feed stream.BACKGROUND[0003]Natural gas from either production reservoirs or storage reservoirs typically contains water, as well as other species, which form solids during the liquefaction to produce liquefied natural gas (LNG). It is common practice for the natural gas to be subjected to a dehydration process prior to the liquefaction. Water is removed to prevent hydrate formation occurring in pipelines and heat exchangers upstream of the liquefaction vessel.[0004]If water is not removed, solid hydrates may form in pipe work, heat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D9/04F25J3/00C07C7/00C10L3/10F25J3/06F25J3/08
CPCC10L3/10C10L3/102F25J3/061F25J3/0635F25J3/067F25J2205/20Y02C10/12F25J2215/04F25J2220/64F25J2220/66F25J2220/68F25J2245/02F25J2205/30Y02C20/40
Inventor AMIN, ROBERTGROOTHUIS, CASPER KRIJNO
Owner WOODSIDE ENERGY
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