Method of purifying a neon-helium mixture

Details Method of purifying a neon-helium mixture Method of purifying a neon-helium mixture

1975-02-05

1976-06-15

Adee, John

Gas separation

Means within gas stream for conducting concentrate to collector

55 58, 55 66, 55 68, B01D 5302

Patent

active

039634620

ABSTRACT:
A method of purifying a neon-helium mixture containing 2 to 7 vol.% of neon, 1 to 3 vol.% of helium, 0.5 to 1.5 vol.% of hydrogen, 88.5 to 96.5 vol.% of nitrogen, traces of oxygen and traces of hydrocarbons having from 1 to 5 carbon atoms by freeing said mixture from nitrogen, oxygen, hydrogen and hydrocarbons, which comprises removing nitrogen by dephlegmation at a temperature of from 67.degree. to 77.degree.K. and a pressure of 4 to 7 kgf/sq.cm. to give a mixture containing 68 to 74 vol.% of neon, 22 to 74 vol.% of helium, 1.5 to 2 vol.% of hydrogen, 1 to 8 vol.% of nitrogen and trace amounts of oxygen and hydrocarbons. The latter mixture is passed at a pressure of from 4 to 7 kgf/sq.cm. through microporous adsorbents having 3 to 9-A micropores, adsorbing the remaining nitrogen, oxygen, hydrogen and hydrocarbons. Then said impurities are desorbed by gradually reducing the pressure of the mixture from 4 to 7 kgf/sq.cm. down to 10.sup.-.sup.1 to 10.sup.2 mm Hg. The adsorption and desorption steps are effected with the microporous adsorbents being thermostated with liquid nitrogen.

REFERENCES:
patent: 3616602 (1971-11-01), Hays
patent: 3838553 (1974-10-01), Doherty

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