Group 18 elements Extraction
المؤلف:
CATHERINE E. HOUSECROFT AND ALAN G. SHARPE
المصدر:
INORGANIC CHEMISTRY
الجزء والصفحة:
2th ed p 493
4-3-2017
1846
Group 18 elements Extraction
In terms of commercial production, He and Ar are the two most important noble gases. Helium is extracted from natural gas by liquefaction of other gases present (He has the lowest boiling point of all the elements), leaving gaseous He which is removed by pumping. Neon is extracted as a byproduct when air is liquefied, being left behind as the only gas. Argon has almost the same boiling point as O2 (Ar, 87K; O2, 90K) and the two gases remain together during the fractionation of liquid air. The O2/Ar mixture can be partially separated by further fractionation; the crude Ar is mixed with H2 and sparked to removed O2 as H2O, excess H2 being removed by passage over hot CuO. Krypton and xenon are usually separated from O2 by selective absorption on charcoal.
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