This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...of the total amount of sulphur in the coal which passes into the gas on carbonization, increases with the temperature of distillation, especially that portion which is not evolved as sulphuretted hydrogen. This even increases at a greater rate than the volume of gas made, so that high heats mean not only a greater ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...of the total amount of sulphur in the coal which passes into the gas on carbonization, increases with the temperature of distillation, especially that portion which is not evolved as sulphuretted hydrogen. This even increases at a greater rate than the volume of gas made, so that high heats mean not only a greater amount of sulphur in the total gas from a given weight of coal, but even a greater amount per volume of gas made. For the results of a number of experiments on this point, a paper entitled " Studies in Goal Distillation," by Lewis T. Wright, may be consulted.1' The admixture of a small amount of lime with the coal, prior to distillation, diminishes the quantity of sulphur passing into the gas; in some cases, by as much as one-half its weight under the ordinary conditions. Quality and Quantity of Gas Produced.--The carbonization of coal may now be considered in relation to the quality and quantity of gas produced. The gas evolved shortly after coal is placed in a retort at an ordinary carbonizing temperature, contains the gases occluded in the coal. These are mainly 'Amer. Chem. Jomn., iv., 1.-I-Joum. S00. Chem. Ind., 1888, 59. nitrogen and methane, with small quantities of oxygen, carbonic acid, and other gases; consequently, the "illuminating power " of the gas coming from the retort during the first half hour after charging is very low. Then it rises rapidly, and the gas evolved during the next hour is the best obtained from the charge. If the heat of the retort is low, this period is prolonged, and the gas is even richer. But, from the middle or end of the second hour to the end of the third hour, it may be taken that the_ gas will be considerably poorer, and thence to the end of the distillation that it will be ve...
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