Abstract: A method of burning exhaust gases containing gaseous silane in which the exhaust gases containing gaseous silane to be introduced into a combustion chamber are diluted with an inert gas so that the concentration of silane gas is reduced to less than 30% by volume and the diluted exhaust gases are fed from a nozzle to the combustion chamber and burnt through reaction with air in the combustion chamber while the region between the head of the nozzle top end and the base portion of the burning flame is shielded with an inert gas atmosphere.An inert gas mixing pipe is connected for dilution to an exhaust gas feed section, an enclosure pipe is fitted to the outer circumference of an exhaust gas introduction pipe introduced into the combustion chamber to constitute a double pipe structure, and the enclosure pipe is connected at the rear end thereof to an inert gas feed pipe and slightly protuded at the top end thereof ahead of the top end for the exhaust gas introduction pipe.

Abstract: A process and system are set forth for improving an oxygen-enriched Claus plant by recycling effluent from the first condenser back to the reaction furnace to moderate oxygen induced high temperatures and thus allow additional oxygen-enrichment and attendant throughput in the Claus plant.

Abstract: A process for the removal of acid gases which are reactive with ethylene oxide from a gas mixture containing carbon dioxide, comprises contacting the gas mixture with ethylene carbonate containing sufficient amount of ethylene oxide, whereby the ethylene oxide reacts chemically with the acid gases to produce reaction products which are more easily removable from the gas mixture.

Abstract: A process for the removal of and analysis of phosphine and arsine impurities in silane gas. Silane gas which normally contains the impurities of AsH.sub.3 and PH.sub.3 is contacted with a solution of NaAlH.sub.4 in dimethoxyethane, other ether or amine to remove the impurities therefrom. The dimethoxyethane or other ether solution may then be hydrolyzed with water or alcohol to evolve hydrogen gas from the NaAlH.sub.4 and to re-evolve phosphine and arsine which may then be quantitatively determined by gas chromatography, atomic absorption, or other means.

Abstract: A process for the production of silicon nitride by reaction of silicon dioxide, carbon and nitrogen at temperatures above about 1300.degree. C. whereby a partial pressure of nitrogen above 1 bar is maintained during the reaction.

Abstract: Decontaminating an aluminum melt by chlorination wherein the melt is blanketed with a layer of molten flux containing calcium oxide to consume any Cl.sub.2 and/or AlCl.sub.3 offgasses from the melt.