Method of purifying a neon-helium mixture

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 h...

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Bibliographische Detailangaben
Hauptverfasser:	IGNATOV, JURY YAKOVLEVICH, GOLOVKO, GEORGY ANATOLIEVICH
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMBINED HEATING AND REFRIGERATION SYSTEMS COMPOUNDS THEREOF HEAT PUMP SYSTEMS HEATING INORGANIC CHEMISTRY LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING METALLURGY MIXTURES BY PRESSURE AND COLD TREATMENT NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL REFRIGERATION OR COOLING SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	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 DEG to 77 DEG 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 101 to 102 mm Hg. The adsorption and desorption steps are effected with the microporous adsorbents being thermostated with liquid nitrogen.