TAYABAS PETROLEUM. 5 



ticity of the sample of oil (Laboratory Nos. 5G695 and 68192) originally 

 examined. For this reason and also because it more nearly represents 

 the fresh oil from the oil bearing strata, sample No. 2 was selected for 

 further study. 



OIL SAMPLE NO. 2. 



Physical and chemical properties. — Color slightly brownish, wine-red 

 by transmitted light and bluish flourescent by reflected light. It is 

 particularly mobile and free from water and sediment. No deposit of 

 solid hydrocarbons occurs when cooled to — 15°. The specific gravity 

 is 0.8325 (39° Baume) at 15°. Flash point (Abel's closed cup) 0°. 



The crude oil possesses no objectionable odor and gives negative quali- 

 tative tests for sulphur. 



Fractional distillation test. — One hundred cubic centimeters of the 

 crude oil measured at 15° were transferred to a distilling flask and 

 carefully fractioned under the exact conditions prescribed by Engler. 



The initial boiling temperature was taken when the first drop of 

 distillate fell from a 75-centimeter condensing tube of 75° inclination. 

 The average results of duplicate distillations are given : 



Specific gravity 

 at 15°. 

 Initial boiling point 91°. 



Gasoline fraction 91° to 150° 39 per cent 0.770 



Kerosene fraction 150° to 300° 44.5 per cent 0.850 



Residium above 300° by difference 16.5 per cent. 



UNSATURATED HYDROCARBONS. 



The unsaturated hydrocarbons present in the crude oil and the gasoline 

 and kerosene fractions were determined as follows : 



Twenty-five cubic centimeters of oil measured at room temperature 

 were transferred to a 100 cubic centimeter, graduated glass-stoppered cylin- 

 der, 25 cubic centimeters of sulphuric acid (specific gravity 1.84) were 

 added and the mixture shaken until no more reduction in the oil volume 

 was observed. The volume of oil absorbed by the sulphuric acid was 

 taken to represent unsaturated hydrocarbons. Under the conditions of 

 the test the crude oil, the gasoline and kerosene fractions contained 30, 

 16 and 24 per cent of unsaturated hydrocarbons, respectively. 



NATURE OF THE UNSATURATED HYDROCARBONS. 



One liter of the crude oil was shaken for eight hours with 0.5 liter 

 of a mixture consisting of 1.5 volumes of sulphuric acid (specific gravity 

 1.84), and 1 volume of fuming sulphuric acid (50 per cent S0 3 ). Under 

 these conditions 700 cubic centimeters of oil were separated, leaving 300 

 cubic centimeters, or 30 per cent of the original volume, absorbed by the 

 acid. 



