Dual mixed refrigerant natural gas liquefaction

Details Dual mixed refrigerant natural gas liquefaction Dual mixed refrigerant natural gas liquefaction

1983-10-25

1985-10-08

Sever, Frank

Refrigeration

Processes

Circulating external gas

62 40, 62335, F25J 102

Patent

active

045457956

ABSTRACT:
A process and apparatus is described for liquefying natural gas using two closed cycle, multicomponent refrigerants wherein a low level refrigerant cools and liquefies the gas by indirect heat exchange and a high level refrigerant cools and partially liquefies the low level refrigerant by indirect multistage heat exchange. The high level refrigerant is phase separated in order to use lighter refrigerant components to perform the final lowest level of refrigeration while the liquid phase of the separation is split and then expanded for refrigeration duty in order to avoid multiple flash separations wherein heavier components are used to provide the lower levels of refrigeration.

REFERENCES:
patent: 4094655 (1978-06-01), Krieger
patent: 4112700 (1978-09-01), Forg
patent: 4274849 (1981-06-01), Garier et al.
patent: 4339253 (1982-07-01), Caetani et al.
Paradowski, H. and Sguera, O., "La Liquefaction des Gas Associes", 7th International Conference on LNG, May 15-19, 1983, (Abstract in English).

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