F - Mech Eng,Light,Heat,Weapons – 25 – J
Patent
F - Mech Eng,Light,Heat,Weapons
25
J
F25J 3/04 (2006.01)
Patent
CA 2049519
ABSTRACT OF THE DISCLOSURE A process of producing nitrogen by cryogenic separation of air in a single distillation column process, which comprises: a) cooling a feed air substantially free of impurities in a main heat exchanger, such that feed air exchanges heat with outgoing products, b) passing said feed air to a bottom reboiler exchanger at the bottom of a distillation column, in fluid connection with said reboiler, where said feed air is condensed by heat exchange with vaporizing liquid to form liquefied air, thereby providing a reboil to said distillation column, c) passing said liquefied air from said bottom reboiler to the distillation column on at least one theoretical tray above the reboiler but below the top tray, thereby separating said liquefied air in said column into a nitrogen-rich vapor stream at the top, and an oxygen-rich liquid stream at the bottom of said column, d) condensing a portion of the nitrogen-rich stream in an overhead condenser to form liquefied nitrogen and returning a portion of the same to the top of the column to provide reflux for distillation, recovering a second portion of the nitrogen-rich stream from the top of the distillation column as a vapor product, and warming the same in said main heat exchanger, and recovering the remaining portion of liquefied nitrogen as product, e) vaporizing a portion of the oxygen-rich liquid fraction in the reboiler against condensing air to provide a reboil for distillation, and removing a remaining portion of the oxygen-rich liquid as a bottom stream from the distillation column, f) subcooling said oxygen-rich liquid bottom stream in a subcooler by outgoing product, and expanding said oxygen- rich liquid bottom stream at reduced pressure, g) vaporizing said oxygen-rich stream in said overhead condenser, and warming the same in said subcooler and said main heat exchanger, said stream exiting said cold box as an oxygen-rich stream by-product, and h) expanding said nitrogen-rich stream from said main heat exchanger to lower pressure in an expander to provide process refrigeration, then warming said nitrogen-rich stream exiting from the expander in said main heat exchanger, said nitrogen-rich stream then exiting said main heat exchanger as product.
Liquid Air Engineering Corporation
Swabey Ogilvy Renault
LandOfFree
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