Refrigeration – Processes – Circulating external gas
Patent
1986-04-01
1987-10-06
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 32, 62 42, F25J 302
Patent
active
046980814
ABSTRACT:
A process for separating the gas components contained in liquified natural gas wherein a small amount of heavier reflux liquid (propane, butane, pentane, iso-butane and iso-pentane) is recycled to the top of a demethanizer column. This alters its chemical equilibrium causing methane to vaporize in large quantities and to separate from the liquified feed stream. A fractionator receives the heavier demethanized liquid end product from the demethanizer column and through distillation separates the lighter ethanes and propanes from the heavier reflux liquid, a portion of the latter being recycled to the demethanizer column.
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Capossela Ronald C.
Edwards Robert J.
Hoelter Michael L.
McDermott International Inc.
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