Refrigeration – Processes – Circulating external gas
Patent
1976-10-06
1978-10-24
Yudkoff, Norman
Refrigeration
Processes
Circulating external gas
62 23, 62 40, 62 41, 62 52, F25J 302
Patent
active
041219171
ABSTRACT:
A process for utilizing liquefied natural gas as a source of refrigeration in an ethylene plant of the type featuring a "front-end" depropanizer and a forecooling recovery section, wherein the forecooling section is operated at lower than conventional temperature and pressure levels while the final separation section is maintained at conventional operating conditions. Liquefied natural gas is heat exchanged with recovered depropanizer column overhead gas in the forecooling section and with overhead of the demethanizer and C.sub.2 splitter columns to condense reflux, thereby closely matching the cooling curve of the ethylene plant with the LNG warming curve to achieve highly efficient utilization of the LNG refrigeration.
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patent: 3849096 (1974-11-01), Kniel
Kniel, L., "LNG Cold Potential Could Cut Ethylene Costs", The Oil Gas Journal, Sep. 15, 1969, pp. 96-99.
Baker Charles Richard
Cheung Harry
Hultquist Steven J.
Union Carbide Corporation
Yudkoff Norman
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