S from a natural gas stream
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United States of America Patent
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Nov 22, 2016
Grant Date -
Feb 17, 2011
app pub date -
Jun 27, 2008
filing date -
Jun 27, 2007
priority date (Note) -
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Abstract
A method for removing hydrogen sulphide (H2S) from a natural gas stream comprising methane (CH4) and H2S comprises: —cooling the natural gas stream in a heat exchanger assembly (13,16,18); —feeding at least part of the cooled natural gas stream through a feed conduit (19,21) into a cyclonic expansion and separation device (1) in which the cooled natural gas stream is expanded in a nozzle (4) and thereby further cooled to a temperature and pressure below the dew point of H2S and is separated by inducing the cooled natural gas stream to swirl in a tubular separation chamber (9) thereby inducing centrifugal forces to separate the cooled natural gas stream into a cooled low density fluid fraction, which is H2S depleted and methane enriched, and a cooled high density fluid fraction, which is H2S enriched and methane depleted; —feeding the cooled low density fluid fraction to a product gas conduit (33) which is connected to the heat exchanger assembly (14) for cooling the natural gas stream fed to the cyclonic expansion and separation device (1); and —feeding the cooled high density fluid fraction to a fractionating column (8) for further separation.
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