Societies and Academies

    Abstract

    LONDON. Society of Chemical Industry (London Section), February 5.—Mr. R. J. Friswell in the chair.—Carburetted water gas in the Bunsen burner: M. Chikashigé. Carburetted water gas is now prepared in the Kyoto University by injecting heavy petroleum oil with steam into a water-gas generator filled with ignited coke. The gas produced is passed through a superheater loosely packed with fire-bricks, and then through a scrubber, after which treatment it enters the gas holders. The mean composition of the gas differs little from that of coal gas, and the products of combustion closely resemble those of coal gas. The carburetted gas has no effect on the ordinary laboratory vessels, and the products of combustion, unlike those of plain water gas, are not more injurious in insufficiently ventilated laboratories than those of coal gas.—The loss of nitre in the chamber process, part ii. J. K. H. Inglis. The loss of nitre, which usually amounts to about 3 per cent. of the sulphur burnt, can best be traced by complete analyses of the flue gases. The analysis cannot be carried out by means of aqueous absorbents owing to the formation of complicated bodies by the interaction of nitrous acid and sulphur dioxide. But the analysis may be conveniently made by the fractional distillation of the gases, first at the temperature of liquid air and subsequently at higher temperatures. The results showed that only about 4 per cent. of the lost nitre was lost as nitrous oxide and 43 per cent. as nitrogen peroxide. In the first experiments the temperature of liquid air was insufficient to effect the separation of nitric oxide from the flue gases owing to the vapour pressure of nitric oxide. Some further experiments were therefore made at a lower temperature obtained by making liquid air boil under diminished pressure. The amount of nitrogen oxides found was no greater than in the earlier experiments, and this might therefore mean that nitric oxide is not present in the flue gases.—The removal of nitrous acid from concentrated nitric and sulphuric acid: O. Silberrad and B. J. Smart. The experiments were made to determine to what extent the reaction between nitrous acid and amines or amides occurs in concentrated acids. Nitric acid containing a small percentage of nitrous acid was taken either alone or in admixture with sulphuric acid. The addition of hydrazine occasions an explosion, and with this exception substances such as urea, lead peroxide, oxamide, methylamine nitrate, and amido guanidine are very inert towards nitrous acid in presence of concentrated nitric acid, although they react readily in dilute solution. The observation of Franchimont that urea nitrate decomposes with evolution of carbon dioxide and nitrous oxide was confirmed.

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