Nitrogen Rejection Unit System and Method for Low Nitrogen Concentration Feeds
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United States of America
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Issued Date -
Dec 5, 2024
app pub date -
May 30, 2024
filing date -
May 30, 2024
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Abstract
A system and methods for removing nitrogen from a natural gas or liquid natural gas stream. More particularly, a system and method for removing nitrogen from a natural gas feed stream that uses a two-column system with a first column operating at a pressure that is lower than the operating pressure of the second column. A first nitrogen-enriched vapor stream from the first column is compressed and cooled and the resulting stream is then directed to the second column, which produces a second nitrogen-enriched vapor stream and a second methane-enriched liquid stream. Cooling in the system is provided in heat exchangers that warm a first methane-enriched liquid stream from the first column and the second methane-enriched liquid stream from the second column.
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