CPC F25J 3/0238 (2013.01) [C10G 5/04 (2013.01); C10G 5/06 (2013.01); F25J 3/0209 (2013.01); F25J 3/0233 (2013.01); C10G 2300/1025 (2013.01); C10G 2300/4056 (2013.01); F25J 2200/02 (2013.01); F25J 2200/30 (2013.01); F25J 2200/76 (2013.01); F25J 2205/04 (2013.01); F25J 2205/60 (2013.01); F25J 2215/62 (2013.01); F25J 2290/80 (2013.01)] | 8 Claims |
1. A natural gas liquid plant bolt-on unit, comprising:
an absorber configured to condense an ethane content from an overhead gas stream from a demethanizer using a cold lean residue gas to produce a liquid portion and a vapor portion, wherein the demethanizer is configured to receive the liquid portion as a first reflux;
a reflux exchanger configured to receive at least a portion of the vapor portion and use the portion of the vapor portion to provide cooling within the reflux exchanger; and
a flow control valve configured to direct between about 70% to 90% of the vapor portion to a subcool exchanger to provide cooling to a portion of a feed stream that is directed to the demethanizer and configured to direct about 10% to about 30% of the vapor portion to the reflux exchanger to provide the cooling within the reflux exchanger to cool a residue gas stream that is directed to the absorber.
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