Abstract: The disclosure is directed to an improved catalytic combustion arrangement for use, for example, in a gas stove or the like, which has a heat insulation diffusion layer is provided in a catalytic mat layer for the improvement of combustion rate around the catalytic mat, and, through employment of two sets of thermo-couples, a heating burner for the catalytic mat is adapted to burn only during starting of combustion, and to be automatically extinguished upon arrival at a steady combustion state for continuous combustion only by the catalytic mat, with a simultaneous indication of such combustion.

Abstract: A gas purification system has: a first treatment apparatus, which purifies an untreated feed gas, containing toxic ingredients such as HCN gas, H.sub.2 S gas and NH.sub.3 gas, into a primary treated gas by causing the feed gas to contact with an alkaline absorbent liquid; an absorbent-liquid-resuscitation apparatus, which refreshes the absorbent liquid, after absorbing the toxic ingredients, by bubblingly introducing a resuscitation gas; and a second treatment apparatus, which further purifies the primary treated gas into a secondary treated gas by strippingly capturing any possible remnant NH.sub.3 gas still present in the former. The resuscitation gas and the toxic-ingredient-absorbed absorbent liquid are forcibly converged by premix nozzles into combined gas/liquid jets as are injected into the absorbent-liquid-resuscitation apparatus.

Abstract: A system for generation of electricity which comprises warming an intermediate heat exchange medium, cooled and liquefied as the result of having been used for warming LNG to vaporize, with water or sea water to vaporize, introducing the vaporized intermediate heat medium into a turbine equipped with an electric power generator for driving and using again the intermediate heat medium discharged from the turbine for warming LNG to vaporize while the intermediate heat medium discharged from the turbine is contacted with the condensed liquid of the intermediate heat medium with intervention of a packing material.

Abstract: The present invention relates to apparatus for measuring calorific value and Wobbe index of gas by determining the specific gravity of the gas, and apparatus for controlling the calorific value of the gas in accordance with the specific gravity. The specific gravity of the gas is related to the sonic speed in the gas which is determined by means of electric equipment. The electric equipment contains a pair of acoustic tubes, in one of which is contained gas being measured, and in the other of which is contained standard gas. Each of the acoustic tubes is provided at opposite ends thereof with a microphone and a speaker, and a pair of amplifiers, one each associated with a respective microphone and speaker. Howling occurs in each acoustic tube. Consequently a signal having a beat frequency is obtained by mixing and detecting the outputs from the amplifiers, and the beat frequency is representative of the specific gravity of the gas being measured.

Abstract: Thermoshrinkable or thermoexpansive tubes for corrosion prevention or lin of piping are disclosed which have their inner and/or outer walls covered with at least one protective cover to keep them clean from dust, dirt, water or any other foreign matter which might interfere with adhesion to the pipe connection, thus causing corrosion or poor lining.

Abstract: A method for reactivation of a platinum group metal catalyst which comprises treating the platinum group metal catalyst lowered in catalytic activity as the result of having been used for the catalytic reaction of hydrocarbons optionally containing an oxygen atom with at least one agent selected from an inorganic alkaline substance and a reducing substance in an aqueous medium.

Abstract: A method for reactivation of a platinum group metal catalyst which comprises treating the platinum group metal catalyst lowered in catalytic activity as the result of having been used for the catalytic reaction of hydrocarbons optionally containing an oxygen atom with at least one agent selected from an inorganic alkaline substance and a reducing substance in an aqueous medium.

Abstract: A method for producing pitch and coke which comprises heating a starting oil material in the presence of a powdery carbonaceous substance at a temperature of 350.degree. to 600.degree. C under an increased pressure of at least 2 kg/cm.sup.2 gauge to produce pitch, coke and oil and separating the pitch and coke from the oil, said starting oil material being distillation residue of crude oil having a Conradson carbon residue of 1 to 25 weight percent and containing 20 to 80 weight percent of substances boiling at a temperature of at least 600.degree. C and less than 10 weight percent of substances boiling at a temperature lower than 350.degree. C, said powdery carbonaceous substance having a Conradson carbon residue of at least 50 weight percent and being added to the starting oil material in such an amount that Conradson carbon residue of the carbonaceous material is in the range of one-tenth to ten times that of the starting oil material.

Abstract: A method of treating a waste combustion gas from a coke oven comprising the steps of deoxidizing the waste gas, introducing the deoxidized gas into a dry-quenching unit as a gas for quenching red-hot coke, recovering the sensible heat of the red-hot coke given to the gas discharged from the dry-quenching unit for use as a heat source for generating steam and thereafter discharging the gas.

Abstract: In producing cracked gas and cracked oil by thermally cracking a heavy hydrocarbon within a reactor in which a granular solid, steam and oxygen form a fluidized bed or moving bed, a process which is characterized in that the heavy hydrocarbon is supplied to the upper portion of the reactor and part of the granular solid is discharged from the bottom of the reactor and thereafter fed again to the upper portion of the reactor, to thereby maintain the upper portion at a temperature of not higher than 550.degree.C.