Abstract: This invention provides a manufacturing process which produces highly purified Xenon economically and safely with high recovery efficiency. In this invention liquid oxygen containing Xenon, which is vented from the main condenser in the upper rectification column of the air separating unit, is sequentially fed into multiple adsorptive columns filled with an adsorbent to selectively adsorb the Xenon. By a sequence of adsorbing-desorbing steps, Xenon is gradually condensed and, at the final state, highly purified Xenon is recovered. Hydrocarbons (CmHn) are removed from the product gas by a catalytic process. Xenon at a purity as high as 99.995% and at a yield as high as 95% is obtained by use of the present process.

Abstract: A method of forming a protective coating on a long immersible lance is disclosed. A mold having an inlet port in a peripheral portion thereof is laid on its side so that the inlet port faces upwardly. A long lance is set in the mold with a clearance left between the mold and the lance that corresponds to the required thickness of coating. Then a coating material is cast into the clearance through the inlet port to thereby form a coating on the lance, followed by drying of the coating.