Abstract: A stainless cast alloy steel suitable for ground joint portions, airtight portions, sliding portions, etc., used at low temperatures comprising: from about 0.03 to about 0.15% by weight of C; up to about 2% by weight of Si; up to about 2% by weight of Mn; from about 18 to about 26% by weight of Cr; from about 5 to about 13% by weight of Ni, the remainder being Fe and unavoidable trace impurities; wherein a ferrite phase is present in an amount of from about 10 to about 40% by volume, based on the volume of the stainless cast alloy steel.

Abstract: During use of a contact apparatus to remove harmful components, such as sulfur and nitrogen oxides, from waste gas, dust particles are deposited on the interior of the gas-solid contact zone and reduce efficiency of the apparatus. The dust particles can be removed by passing through the contact apparatus a current of a carrier gas supporting solid particles of, for example, siliceous sand. The particles have a diameter of 50 to 2000 .mu.m and the actual linear velocity of the carrier gas in the gas-solid contact zone is from 2 to 15 m/sec. The carrier gas can be the waste gas itself so that dust removal can be carried out without interrupting use of the apparatus. The solid particles can be removed from the carrier gas and recycled for further dust removal.

Abstract: The present invention provides an oil detecting element capable of accurately detecting oil floating on water. The oil detecting element comprises a water-repellent, oil-passing filtering member for preventing water coming into the element. Oil can be detected by detecting change in electric resistance of a conductive particle layer due to its contact with oil arriving through the member. According to an embodiment of the invention, the water-repellent, oil-passing filtering member is impregnated with a material which is toxic to water life such as algae and shells to prevent settling of these water life on the surface of the element and thereby to prolong the life of the element. Examples of an oil detector incorporating the oil detecting element and including an electrical circuit which detects change in electric resistance of the element upon its contact with oil and actuates a suitable alarming device such as a buzzer are described.

Abstract: A process for the dry distillation of used rubber in a fluidized bed-forming oven comprises heating used rubber under agitation in the presence of solid particles to temperatures sufficient to make the rubber pulverized and further heating the thus-obtained rubber particles to temperatures sufficient to pyrolyze the rubber particles while forming a fluidized bed thereof and burning a part thereof in the stream of an oxygen-containing fluidizing gas.

Abstract: The present invention provides an apparatus, and a method for the regeneration of spent wet active carbon, which apparatus comprises a drier for substantially drying the spent carbon, a heating furnace provided with at least one burner and at least one duct, and a regeneration chamber consisting of at least one set of inner cylinder and outer cylinder installed concentrically and vertically inside said heating furnace to penetrate the top and bottom walls of the furnace, wherein said inner and outer cylinders have respectively a multiplicity of holes penetrating the side walls thereof, said inner cylinder is connected with a supply tube for a regeneration gas capable of effecting regeneration of the dried carbon-to-be-regenerated upon contact therewith, the upper end of said outer cylinder is connected with said drier so as to receive said dried carbon therefrom while the lower end thereof forms an outlet for the regenerated carbon, and said duct is connected with the drier so as to facilitate direct or indir

Abstract: An apparatus for facilitating the contact between solid particles and a fluid, which apparatus comprises a multi-layered network structure composed of a plurality of network structures consisting of a plurality of square nets of equal size held at regular intervals by means of spacers extending parallel to the nets separate fluid flow, said spacers concurrently forming plural elongated compartments with rectangular cross-section in conjunction with two adjacent nets, a bottom member placed at the lower ends of said nets alternately between two adjacent nets and edge holders for said nets as fixed parallel to said spacers, a housing to accommodate said multi-layered network structure and solid particles packed in said compartments of alternate layers of the multi-layered network structure; thereby a fluid being passed through fluid flow passages formed as alternate layers between said packed layers contacts solid particles.

Abstract: A process of manufacturing a methane-containing gas, which comprises introducing a hydrocarbon feed material containing hydrocarbons having at least 2 carbon atoms per molecule and steam preheated to a temperature in the range of 250.degree.-600.degree. C into a steam reforming reactor (or reactors) packed with a nickel-containing catalyst comprising nickel and magnesia and further containing a copper-chromium mixture in the form of oxide or a copper-chromium-manganese mixture in the form of oxide and effecting steam reforming reaction of said hydrocarbons while maintaining the temperature of the catalyst bed of said reactor(s) in the range of 300.degree. to 600.degree. C.

Abstract: A process of manufacturing a methane-containing gas, which comprises introducing a feed hydrocarbon having at least 2 carbon atoms per molecule and steam preheated at a temperature in the range of 250.degree. - 600.degree. C into a steam reforming reactor (or reactors) packed with a nickel-containing catalyst which has been prepared so that a solid solution consisting of a nickel oxide and magnesia is contained therein and further a copper-chromium oxide or a copper-chromium-manganese oxide is contained therein and effecting steam reforming reaction of said hydrocarbons while maintaining the temperature of the catalyst bed of said reactor(s) in the range of 300.degree. - 600.degree. C.

Abstract: A process for the removal of nitrogen oxides from a waste gas containing said oxides in conjunction with sulfur oxides which comprises contacting said waste gas with ammonia as a reducing agent at temperatures of from 250.degree. to 550.degree. C in the presence of a catalyst wherein an active component containing iron or copper as the active metal and a sulfate of aluminum are supported on a silica carrier.

Abstract: A process for manufacturing a methane-containing gas, which comprises introducing a hydrocarbon feed material containing hydrocarbons having at least 2 carbon atoms per molecule and steam preheated to a temperature in the range of 250.degree. to 600.degree. C into a steam reforming reactor (or reactors) packed with a catalyst comprising a nickel component and a magnesia component supported on a carrier, and effecting a steam reforming reaction of said hydrocarbons while maintaining the temperature of the catalyst bed of said reactor(s) in the range of 300.degree. to 600.degree. C.

Abstract: In conducting the butt welding of a coated steel produced by applying a diffusion coating with aluminum or chromium on the surface of a chromium-molybdenum steel as the base metal, adoption of a process comprising welding the diffusion-coating side of said coated steel with a ferritic high chrome steel to begin with, next welding it with a molybdenum steel or chromium-molybdenum steel selected on the bases of the content of chromium and the content of molybdenum in the base metal, and lastly welding it with the same material as the base metal, varieties of such drawbacks as would ordinarily arise from the weld zone can be avoided.

Abstract: The present invention relates to a method of manufacturing a gas rich in methane by subjecting two varieties or more of hydrocarbons having more than 2 carbon atoms per molecule and different mean molecular weights to steam-reforming process comprising at least two stages, wherein a mixture consisting of hydrocarbons whose means molecular weight is relatively small and steam is introduced to the nickel-containing catalyst bed for the first stage at a temperature in the range of 350.degree. to 550.degree.C, and subsequently, the resulting product is mixed with hydrocarbons whose mean molecular weight is larger than that of the preceding hydrocarbon -- along with steam, if necessary -- and is introduced to the nickel-containing catalyst bed at a temperature in the range of 300.degree. to 550.degree.C for the second stage.