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. 1897 edition. Excerpt: ...qualities of the oil. As shown by the slight changes in specific gravity after the action of ordinary concentrated sulphuric acid, the action of this acid in the usual method of refining does not include to any considerable extent the removal of the aromatic hydrocarbons. Its beneficial action seems to concern more especially the decomposition-products of distillation and certain constituents present in minute quantities, such as the unsaturated hydrocarbons, the oxygen, and nitrogen compounds. It scarcely need be mentioned that this applies to the action of sulphuric acid in the cold. When heated, without doubt a part of the aromatic hydrocarbons would be removed, to the detriment of the burning qualities. The formation of barium salts from all the distillates treated with fuming sulphuric acid proves the presence in appreciable amounts of a wide range of aromatic hydrocarbons. Without reference to the percentages of carbon and hydrogen, the low specific gravity of the hydrocarbons described above is sufficient to show that they are not naphtenes. The following comparison of the unpurified distillates and the purified hydrocarbons as regards their specific gravity with the naphtenes separated by Markownikoff from the Russian oil will perhaps make these differences more clearly understood. Baku naphtenes: B. P. Specific gravity. C,.H I6o0-i62 0.795 (o) C..H,, I8o-i820 0.8119 (o) CH i960-i97 0.8055 (14) Pennsylvania hydrocarbons, C H, 2: Specific gravity at ao B. P. Purified. Unpurified. C10H, I63-i64 0.7479 0.7684 C,H I73-I74 0.7467 6.7502 CH I96-I97 0.7381 0.7673 CH 2i4-2i6 0.7676 0.7745 Another important result of this study is the evidence that the main body of...