Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1997-07-07
2000-08-08
Doerrler, William
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62621, F25J 300
Patent
active
060984252
ABSTRACT:
A process for separation of gases into two components of different boiling points, for example in the separation of ethane from natural gas, comprises a first separation tower V1 and a second separation tower V2. Liquid in stream 5 from a bottom of the first tower is expanded and cooled and is then communicated in stream 6 to the second tower at a lower pressure. Gas from the second tower is communicated back to the first tower so that the first component in stream 10 is extracted from the top of the first tower and the second component in stream 11 is extracted from the bottom of the second tower. A third tower V3 acts as a recycle fractionator upon the gas in stream 7 extracted from the top of the second tower with that gas being compressed into the third tower which is at high pressure. The liquid in stream 5 from the bottom of the first tower is used to cool a condenser E6 at the top of the first tower V1 and to cool the material from the recycle fractionator V3 as it is returned to the top of the first tower.
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Battison Adrian D.
Doerrler William
Thrift Murray E.
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