LNG production in cryogenic natural gas processing plants
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United States of America Patent
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-
May 10, 2005
Grant Date -
Sep 16, 2004
app pub date -
Mar 7, 2003
filing date -
Mar 7, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for liquefying natural gas in conjunction with processing natural gas to recover natural gas liquids (NGL) is disclosed. In the process, the natural gas stream to be liquefied is taken from one of the streams in the NGL recovery plant and cooled under pressure to condense it. A distillation stream is withdrawn from the NGL recovery plant to provide some of the cooling required to condense the natural gas stream. A portion of the condensed stream is expanded to an intermediate pressure and then used to provide some of the cooling required to condense the natural gas stream, and thereafter routed to the NGL recovery plant so that any heavier hydrocarbons it contains can be recovered in the NGL product. The remaining portion of the condensed stream is expanded to low pressure to form the liquefied natural gas stream.
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