Efficient air fractionation

Details Efficient air fractionation Efficient air fractionation

1976-10-27

1978-07-11

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 38, F25J 304

Patent

active

040999459

ABSTRACT:
In a process for the fractionation of air wherein the air is subjected to rectification in a high-pressure column and a low pressure column, wherein in a liquefaction cycle, nitrogen is withdrawn in the gaseous phase from the head of the high-pressure column and is liquefied by heating, compression, recooling, and expansion and recycled as liquid to the high-pressure column and wherein a gas, e.g., air is withdrawn from the high pressure column, is preheated, and is then expanded through a low-pressure expansion turbine, the improvement which comprises cooling the gas expanded in the low-pressure expansion turbine in indirect heat exchange with at least a portion of the nitrogen which is heated in the liquefaction cycle.

REFERENCES:
patent: 2526996 (1950-10-01), Crawford
patent: 3083544 (1963-04-01), Jakob
patent: 3605422 (1971-09-01), Pryor et al.

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