. American chemical journal . S ^- Temp. o° 150° 200° 140° 200° 2^0^ 260° Normal pressure. 50 tnm. pressure. Fractionation of Crude Petroleum. 529. Temp. 0° 150° 140° 100° 130° 260° Normal pressure. 50 mm. pressure. 530 Gilpin and Cram. The area between the two curves represents the proportionof hydrocarbons soluble in sulphuric acid. This, it will beseen, is greatest for the oils of highest specific gravity. On referring to Tables III. and V. it will be noticedthat for several tubes the oil of grade A is heavier thanthat of grade B and sometimes of grade C. Tubes wherethis irregularity
. American chemical journal . S ^- Temp. o° 150° 200° 140° 200° 2^0^ 260° Normal pressure. 50 tnm. pressure. Fractionation of Crude Petroleum. 529. Temp. 0° 150° 140° 100° 130° 260° Normal pressure. 50 mm. pressure. 530 Gilpin and Cram. The area between the two curves represents the proportionof hydrocarbons soluble in sulphuric acid. This, it will beseen, is greatest for the oils of highest specific gravity. On referring to Tables III. and V. it will be noticedthat for several tubes the oil of grade A is heavier thanthat of grade B and sometimes of grade C. Tubes wherethis irregularity is marked are 48, 62, 68, 72, 74, and 80 ofTable III., and 112 and 114 of Table V. A slight irregularityappears in 20, 21, 24, 27, 40, 71, and 85 of Table III. andin 99 of Table V. Where the oils in these cases are not colorless,the color is strongest in those whose specific gravity is greatest,so that although oil of the grade A has passed through themost earth it is yet more strongly colored than oil of gradeB or C. No reason for this variation has been established. Itshould be remembered, however, that the different oils risein the earth
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