High pressure nitrogen production cryogenic process

Details High pressure nitrogen production cryogenic process High pressure nitrogen production cryogenic process

F - Mech Eng,Light,Heat,Weapons

25

J

162/120

F25J 3/04 (2006.01)

Patent

CA 2028252

ABSTRACT The present invention is a cryogenic process to produce medium to high pressure gaseous nitrogen without the use of a nitrogen product compressor. The process is an improvement to a conventional nitrogen generator with waste expander. The present invention reboils crude liquid oxygen from the main distillation column in two stages at different pressures and uses a small number of trays above one of the reboilers. The use of the trays above one of the reboilers allows collection of a pressurized stream with a composition similar to air. This pressurized stream is recycled to an intermediate stage of the main air compressor.

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