摘要:
A hot-gas blowing fan suitable for recirculation of fuel in a solid oxide fuel cell is presented, which comprises a completely gas-tight sealing means and a cooling means using air and which is of a simple structure without employing any utility other than a power source. A completely gas-tight sealing means is formed by disposing a non-magnetic partition wall 11 in a clearance between a fan shaft side magnetic coupling 9 and a motor shaft side magnetic coupling 10 so that the non-magnetic partition wall 11 and a casing 12 hermetically seal a space surrounding a rotating shaft 6 from the outer field, and an air cooling means is constituted by a heat receiving portion 28, a heat transporting portion 29 and an air-cooling/radiating portion 30.
摘要:
In a scroll type compressor, the center and outer periphery portions of the spiral elements are provided with relief for preventing the mutual contact of the spiral elements. Both of the spiral elements come to contact with each other at the intermediate portion thereof. The relief at the center portion is formed within the range defined by the winding angle Y=32(X−1) where X is the winding turn of each of the spiral elements. The range of the intermediate portion is 380°. This construction serves to prevent the excessive pressure increase of the operation chamber at the center portion so that the brake down of the spiral elements may be prevented without lowering the efficiency of the compressor.
摘要:
A forging die has an inner cylinder of a hard material which is composed of 8-40 vol. % of a metal phase including Ni and Mo as major components and the remaining amount of a ceramic phase including Mo.sub.2 NiB.sub.2 and/or (Mo, W).sub.2 NiB.sub.2, and an outer cylinder of metal, wherein the outer periphery of the inner cylinder is in a state of interference fit to the outer cylinder.
摘要:
A low-dusting powdery alginate impression material for dental purposes comprises (a) an alginate, (b) a gelation agent, (c) a gelation controlling agent, (d) a filler, (e) at least one of an oxide, hydroxide and fluoride of a metal and (f) lanolin with or without at least one lanolin derivative, and may further include pigments and perfumes, which provides increased dimensional accuracy, improved manipulatability, improved storage stability, improved dimensional stability and improved surface smoothness.
摘要:
A catalyst composition consisting essentially of(A) a crystalline aluminosilicate zeolite having a silica/alumina mole ratio of at least 10, at least 50% of all its cation sites bing occupied by an alkali metal cation (component A), and(B) a refractory inorganic oxide having (b-1) platinum and (b-2) tin and/or indium supported thereon (component B). A process for cracking non-aromatic hydrocarbons in the presence of the catalyst composition, and a process for isomerizing C.sub.8 aromatic hydrocarbons, particularly xylenes, by applying the catalyst composition in combination with a conventional isomerization catalyst.
摘要:
An improved mouth guard composition comprises an ethylene/vinyl acetate copolymer and a thermoplastic polycarprolactone having a molecuar weight of 10,000-100,000, optionally with polyvinyl acetate, colorants and perfumes.
摘要:
A process for electrolyzing an aqueous solution of an alkali metal chloride by feeding said aqueous solution of an alkali metal chloride into the central space of a hollow quadrilateral frame holding an anode therein, defining an anode compartment, and feeding water or a dilute aqueous solution of an alkali metal hydroxide into the central space of a hollow quadrilateral frame holding a cathode therein, defining a cathode compartment, said anode compartment and said cathode compartment being separated by a cation exchange membrane, in a filter-press type electrolytic cell wherein:(a) each hollow quadrilateral frame is provided with an inlet passage to the central space of said frame for the introduction of an electrolyte and an outlet passage from the central space of said frame for removal of an electrolyzed product;(b) an anode or a cathode is held in each said frame and electrically connected to a power source or an adjacent counter electrode, each said anode or cathode being respectively made of a metal plate having at the central part thereof notched rectangular portions being alternatively bent to project in parallel to said metal plate and displaced therefrom, said notched rectangular portions being defined by adjacent longitudinal parallel cuts through said metal plate; and(c) a gas and liquid permeable non-electrode porous layer made of inorganic particles is formed on the cation exchange membrane in a thickness thinner than that of the membrane on at least one surface of said membrane, wherein said at least one surface of the cation exchange membrane having the porous layer thereon is separated from the anode or cathode facing said porous layer.
摘要:
Sodium bicarbonate is produced in an apparatus comprising a reactor system for the production of sodium bicarbonate which comprises a housing having a plurality of reaction zones being placed in sequence from a last zone to a first zone, each being in liquid and gas flow communication with each adjacent zone; carbon dioxide inlet means being disposed at the bottom of the last zone so that carbon dioxide introduced into said last zone moves upwardly through said zone, and is discharged through a gas-liquid separator at the top of said zone and is then introduced into the bottom of the next adjacent zone, until said gas reaches the top of the first zone where it is discharged through a carbon dioxide gas outlet; inlet means for feeding an ammoniacal brine or a mother liquor to be carbonated into the top of the first zone, counter-currently to the upward movement of the carbon dioxide gas in said first zone, wherein said brine or mother liquor is passed downwardly through said first zone and flows sequentially into each of said adjacent zones in countercurrent contact with the upward moving CO.sub.2 in each of said zones; recirculation means being associated with each zone which directs the downward flow of liquid within said zone, said means having a liquid inlet situated at the top of said zone and a liquid outlet at the bottom of said zone; CO.sub.2 sparger means situated at the bottom of each zone through which CO.sub.2 is introduced into each zone at sufficient force such that a portion of the liquid within said zone is forced upwardly into proximity of the inlet to the recirculation means so that a portion of the liquid is continually introduced into said recirculation means; a gas-liquid separator disposed between each of said adjacent zones which prevents the upwardly forced liquid from re-entering the preceding zone by redirecting said upwardly forced liquid back to said zone, and which permits the unabsorbed CO.sub.2 to be removed from said zone; means for introducing said CO.sub.2 discharged from said gas-liquid separator into the next adjacent zone; and product outlet means disposed in proximity to the bottom of said last zone for recovery of the crystallized sodium bicarbonate-containing slurry.
摘要:
A filter-press type electrolytic cell comprising alternatively arranged frames and diaphragms fastened together to form alternating anolyte compartments and catholyte compartments, wherein said frames comprise two oppositely disposed hollow members one of which has an inlet and the other an outlet for the flow of electrolyte solutions said inlet or outlet being on the outside surface thereof and each of said members having holes on the inside surface thereof which surfaces face each other, whereby the appropriate electrolyte is passed from said member having said inlet into the anolyte or catholyte compartment formed in the frame and the electrolyzed product is discharged from said anolyte or catholyte compartment into said member having said outlet.
摘要:
A process for the recovery of oxides of sulfur from combustion waste gases, which comprises cooling said waste gases and forming entrained particles of sodium compounds, consisting essentially of sodium carbonate, by spray contact with sodium hydroxide or sodium carbonate, converting sodium carbonate in the particles to sodium sulfate by passing said oxides of sulphur containing waste gases and said sodium compound particles over plate-like packings, whereby said particles are comminuted to a finer particle size form so as to enhance the reaction of said sulfate particles with the oxides of sulfur in said waste gases, collecting entrained particles of said sodium compounds in a dust collector.