Refrigeration – Using electrical or magnetic effect – Thermoelectric; e.g. – peltier effect
Patent
1991-04-26
1992-08-18
Bennet, Henry A.
Refrigeration
Using electrical or magnetic effect
Thermoelectric; e.g., peltier effect
62 9, 62 40, F25J 100, F25J 102
Patent
active
051395479
ABSTRACT:
The present invention relates to a process for liquefaction of a nitrogen stream produced by a cryogenic air separation unit. Cold liquid natural gas (LNG) is employed as refrigerant.
A critical feature step of the invention is that the temperature of the vaporizing LNG should be maintained at a temperature lower than the critical temperature of the nitrogen stream being liquefied.
The process involves compressing the nitrogen stream to at least 350 psi in a multistage compressor wherein interstage cooling is provided by heat exchange against vaporizing LNG. Further cooling and flashing of a portion of the liquid nitrogen stream serves to produce a quantity of liquid nitrogen that is free of hydrocarbon contamination and suitable for recycle to the air separation unit.
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Yamanouchi et al., Chem. Engr. Progress, Jul. 1979.
Agrawal Rakesh
Ayres Calvin L.
Air Products and Chemicals Inc.
Bennet Henry A.
Jones II Willard
Kilner Christopher B.
Marsh William F.
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