. American chemical journal . stend to collect at the top of the tube and the unsaturatedhydrocarbons at the bottom. The increasing amount dissolved by sulphuric acid in theheavier oils may be seen in the following curves. The abscissasrepresent temperatures and the ordinates volumes. The samedistance upon the X axis is taken to represent a distillate,regardless of the number of degrees over which it may havebeen collected. The upper curve represents the percentageof the total volume which distilled between given temperatures;the lower curve, the percentage of the total volume recoveredwhich w
. American chemical journal . stend to collect at the top of the tube and the unsaturatedhydrocarbons at the bottom. The increasing amount dissolved by sulphuric acid in theheavier oils may be seen in the following curves. The abscissasrepresent temperatures and the ordinates volumes. The samedistance upon the X axis is taken to represent a distillate,regardless of the number of degrees over which it may havebeen collected. The upper curve represents the percentageof the total volume which distilled between given temperatures;the lower curve, the percentage of the total volume recoveredwhich was not absorbed by sulphuric acid (i. e., the parafiinehydrocarbons). For the upper curve the ordinates wereobtained by dividing the number of cubic centimeters inthe distillate by the total volume of oil recovered. For thelower curve the ordinates were obtained by dividing-the numberof cubic centimeters in the distillate not absorbed by sulphuricacid by the total volume of oil recovered. Fractionation of Crude Petroleum. 527. Temp. 150° 200° 140° 100° 2J0° 260° Normal pressure. 50 mm. pressure. 52i Gilpin and Cram. •2 1^
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