METHOD FOR RECOVERING SEALED ARGON GAS FOR WELDING FROM ATMOSPHERIC EXHAUST GAS OF FURNACE

PROBLEM TO BE SOLVED: To recover sealed argon gas for welding from a gas consisting mainly of argon exhausted from a single crystal manufacturing furnace. SOLUTION: The pressure of a gas 1 consisting mainly of argon exhausted from a single crystal manufacturing furnace is elevated and the gas reacts...

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Hauptverfasser:	YAMASHITA YOSHITOMI, OONISHI TOSHIAKI, TSUKADA KATSUHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To recover sealed argon gas for welding from a gas consisting mainly of argon exhausted from a single crystal manufacturing furnace. SOLUTION: The pressure of a gas 1 consisting mainly of argon exhausted from a single crystal manufacturing furnace is elevated and the gas reacts with oxygen in a reactor 5 by catalytic operation to convert it into carbon dioxide and water. Thereafter, the reaction product is cooled and introduced into a PAS 8 using a synthetic zeolite to eliminate nitrogen, carbon dioxide and water by adsorption and if necessary, oxygen concn. is adjusted and then, it is liquified by heat exchange with a highly pure liquified argon used as an atmospheric gas for a single crystal manufacturing furnace by means of a heat exchanger 22.