Refrigeration – Processes – Circulating external gas
Patent
1982-05-24
1983-10-18
Sever, Frank
Refrigeration
Processes
Circulating external gas
62 39, F25J 302
Patent
active
044103425
ABSTRACT:
A method and apparatus is disclosed for separating a liquid product from a hydrocarbon-containing feed gas, such as natural gas, including introducing the feed gas to a heat exchanger; cooling the feed gas in the heat exchanger to condense a portion of the feed gas to form a first vapor fraction and a rich liquid fraction; flowing the first vapor fraction at a predetermined inlet pressure through an expansion valve to reduce the pressure of the first vapor fraction to a pressure at or below 1/3 of the expansion valve inlet pressure; flowing the rich liquid fraction through a second expansion valve to reduce the pressure of the rich liquid fraction to a pressure at or below 1/3 of the second expansion valve inlet pressure; introducing the cooled first vapor fraction and the cooled rich liquid fraction into the heat exchanger for indirect heat-exchange with the feed gas to cool the feed gas; removing the rich gas from the heat exchanger; condensing a portion of the rich gas to form a liquid product and a rich vapor fraction; and adding the rich vapor fraction to the feed gas and recycling the rich vapor fraction, in admixture with the feed gas, to the heat exchanger.
REFERENCES:
patent: 3373574 (1968-03-01), Fisher
patent: 3675435 (1972-07-01), Jackson et al.
Sever Frank
United States Riley Corporation
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