Integrated nitrogen removal in the production of liquefied natural gas using dedicated reinjection circuit
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United States of America Patent
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Nov 14, 2017
Grant Date -
Oct 29, 2015
app pub date -
Apr 24, 2014
filing date -
Apr 24, 2014
priority date (Note) -
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Abstract
A method and apparatus for liquefying a natural gas feed stream and removing nitrogen therefrom to produce a nitrogen-depleted LNG product, in which a natural gas feed stream is passed through main heat exchanger to produce a first LNG stream, which is separated to form a nitrogen-depleted LNG product and a recycle stream composed of nitrogen-enriched natural gas vapor, and in which the recycle stream is passed through main heat exchanger to produce a first LNG stream, separately from and in parallel with the natural gas feed stream, to produce a first at least partially liquefied nitrogen-enriched natural gas stream that is separated to provide a nitrogen-rich vapor product.
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