C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 21/04 (2006.01) F25J 3/04 (2006.01) F25J 3/08 (2006.01)
Patent
CA 2289173
For producing ultrapure nitrogen by low-temperature fractionation of air in a rectification system having at least one rectification column, compressed and purified feed air is conducted into a high pressure column, an oxygen-free pressurized nitrogen fraction is produced from the high pressure column, conducted into a low-pressure column and in the low-pressure column carbon-monoxide-free low-pressure nitrogen is produced as overhead gas. The oxygen-free pressurized nitrogen fraction (1) is either taken off in the liquid state from an upper region of the high pressure column or is provided from a liquid tank (22) containing stored oxygen-free nitrogen and the oxygen-free pressurized nitrogen fraction (1) is expanded into the bottom-heated low-pressure column (2). Ascending vapour in the low-pressure column (2) by mass transfer with and an ultrapure nitrogen reflux applied at the top of the low-pressure column (2) and is freed from carbon monoxide using ultrapure nitrogen, withdrawn as carbon-monoxide-free overhead gas (5) at the top of the low- pressure column (2). After a pressure increase the overhead (5), is partially liquefied, and the liquefied part (17, 18) is expanded into a bottom-heated He-Ne-H2 column (4) from which the ultrapure nitrogen (19) is withdrawn in the liquid state.
Kunz Christian
Rottmann Dietrich
Johnson Ernest Peter
Kunz Christian
Linde Aktiengesellschaft
Rottmann Dietrich
LandOfFree
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