Abstract: A process for separating oxygen more than 90% pure from a raw material gas, for example air, containing oxygen and nitrogen as main components, includes at least two adsorption zones, each having an inlet and a discharging end, and containing therein a bed of an adsorbing agent having sieving action which is capable of selectively adsorbing nitrogen from said raw material gas.

Abstract: Processes for removing N.sub.2 from a feed gas comprising CO+N.sub.2 or CO, CO.sub.2 +N.sub.2 through PSA by using at least two adsorption columns containing an adsorbent exhibiting selective adsorb property to carbon monoxide which comprises:(i) a step of pressurizing an adsorption column by the feed gas;(ii) a step of introducing the feed gas into the adsorption column, in which step (i) was previously completed, so as to adsorb CO, or CO+CO.sub.

Abstract: A sensor comprising a solid electrolytic having oxygen ion conductivity to measure the amount of oxygen in molten metal by forming an oxygen concentration cell in which the solid electrolytic element is coated on the surface thereof with mixture which is composed of Al.sub.2 O.sub.3 powders and metallic fluoride powders such as MgF.sub.2 or CaF.sub.2.The present coating does not exfoliate at immersing the sensor into the molten metal and fully maintains wettability of the solid electrolytic element 1 and the molten metal, and since it does not hinder oxygen ion conductivity of the solid electrolytic element 1, the sensor rapidly reaches up to the thermal and electrical equilibrium state, thereby to obtain satisfactory emf wave.

Abstract: A method of producing oxygen rich gas utilizing an oxygen concentrator having a plurality of parallel-connected moisture/nitrogen removing units alternately operated to produce an oxygen-rich gas and connected through respective flow regulating valves to a common buffer tank for storing the gas thus produced.

Abstract: A process for deodorizing an exhaust gas containing at least one smelly material selected from the group consisting of acidic smelly materials, such as hydrogen sulfide, mecaptans, dimethyl sulfide, dimethyl disulfide and the like; basic smelly materials, such as ammonia, amines and the like; and smelly organic material, such as ketones, alcohols, aldehydes, carboxylic acids and the like is disclosed. Vapor-liquid contact of the exhaust gas with a sodium hypochlorite solution is caused in the presence of a catalyst which is a mixture of nickel peroxide and at least one carrier. In the presence of the catalyst, placed in a column, sodium hypochlorite solution falling from the upper portion of the column contacts exhaust gas rising from the lower portion of the column to promote catalyst oxidation reaction.

Abstract: An efficient and economical method for the purification of hydrogen gas is proposed by use of an alloy of a rare earth metal with nickel and/or cobalt plus, optionally, iron, copper or chromium, utilizing the great selectivity of the alloy for the adsorption of hydrogen gas with very little adsorptivity for impurity gases commonly found in an impure hydrogen gas. The purification process is carried out by the pressurized adsorption of hydrogen on the alloy powder, followed by the recovery of high-purity hydrogen gas released from the alloy under reduced pressure or by heating. The alloy in the form of powder is preferably activated prior to use by repeated adsorption-desorption cycles of hydrogen on and from the alloy powder.

Abstract: Thermally insulating containers or the Dewar containers useful for shipping and storage of low-temperature liquefied gases, having double walls made of a metal, the space between the walls being evacuated, are provided, the thermal insulation properties of which are prevented from deterioration by putting in the vacuum space, a getter alloy composed of a ternary alloy expressed by the formula LaNi.sub.x Cr.sub.y, where x is a number from 1 to 6, both inclusive and y is a number from 0.1 to 2, both inclusive, working to adsorb traces of hydrogen coming out of the wall material. The alloy is preferably an activated one. The vacuum thermal insulation can further be improved by the presence of an adsorbent having a large specific area which serves to adsorb traces of gases other than hydrogen.

Abstract: There is disclosed an improved electrical contact structure between a solid electrolyte galvanic cell and a powder reference material for detecting the oxygen content of molten metals. The solid electrolyte galvanic cell has a portion embedded in the powder reference material and the portion is irregularly shaped so as to increase the contact area and strength of the joint between the embedded portion and the powder reference material.