PROCESS FOR SEPARATING OFF NITROGEN
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United States of America Patent
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Issued Date -
Feb 24, 2011
app pub date -
Aug 5, 2010
filing date -
Aug 6, 2009
priority date (Note) -
Abandoned
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Abstract
The invention relates to a process for separating off C.sub.2+-hydrocarbons from a feed fraction containing essentially nitrogen and hydrocarbons, wherein a) the feed fraction (1, 20) is partially condensed (E1, E1', E3) and separated by rectification (T) into a C.sub.2+-hydrocarbon-rich fraction (11) and a C.sub.2+-hydrocarbon-depleted fraction (2), b) the C.sub.2+-hydrocarbon-depleted fraction (2) is partially condensed (E2) and separated into a liquid fraction which forms at least in part the reflux (3) for the separation by rectification (T), and a C.sub.2+-hydrocarbon-depleted gas fraction (4), and c) the C.sub.2+-hydrocarbon-depleted gas fraction (4) is separated in a double-column process (N) into a nitrogen-rich fraction (8') and a methane-rich fraction (7''). According to the invention, the liquid fraction obtained in process step b) is fed (10) at least in part likewise to the double-column process (N) and separated therein into a nitrogen-rich fraction (8') and a methane-rich fraction (7'').
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