Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1998-06-26
1999-09-28
Capossela, Ronald
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62631, 62929, F25J 300
Patent
active
059569719
ABSTRACT:
This invention relates to a process for producing pressurized liquid rich in methane from a multi-component feed stream containing methane and a freezable component having a relative volatility less than that of methane. The multi-component feed stream is introduced into a separation system having a freezing section operating at a pressure above about 1,380 kPa (200 psia) and under solids forming conditions for the freezable component and a distillation section positioned below the freezing section. The separation system produces a vapor stream rich in methane and a liquid stream rich in the freezable component. At least a portion of the vapor stream is cooled to produce a liquefied stream rich in methane having a temperature above about -112.degree. C. (-170.degree. F.) and a pressure sufficient for the liquid product to be at or below its bubble point. A first portion of the liquefied stream is returned to the separation system to provide refrigeration to the separation system. A second portion of the liquefied stream is withdrawn as a pressurized liquefied product stream rich in methane having a temperature above about -112.degree. C. (-170.degree. F.).
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Bowen Ronald R.
Cole Eric T.
Thomas Eugene R.
Capossela Ronald
Exxon Production Research Company
Lawson G. D.
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