MABERY. COMPOSITION OF PETROLEUM. 301 



Composition of the Portions of Japanese Petroleum with 



High Boiling Points. 



Japanese petroleum from different sources differs materially in its com- 

 position. From such oils as the Hirei no crystalline solids can be sepa- 

 rated, even at low temperatures. But from others, such as the Amaze, 

 Miyagawa, and Hiyama, crystalline solids separate from the higher 

 fractions. The fraction 310°-315° atmospheric pressure, from Amaze 

 crude oil became solid on cooling. The solid portion was separated by 

 cooling and filtration ; it was washed, pressed, and warmed with gasoline 

 which removed all color. Melting point, 68°. The fractions above 22o° 

 were collected in vacuo under 30 mm. The purified solid from 225°- 

 230° melted at 70°, that from 2o0°-275° at 73°, and that from 2G0°- 

 265° at 74°. The solid from 225°-230° gave, by combustion, values 

 showing it to belong to the series Cn^2n+2. 



0.1535 grm. of the oil gave 0.4890 grm. CO2 and 0.1787 grm. HgO. 



Calculated for „ , 



p TT p XT Found. 



C 85.14 85.70 85.29 



H 14.86 14.30 14.99 



The fraction 250°-260°, 30 mm., from the Amaze oil gave the follow- 

 ing percentages by combustion, also showing the series C„H2„+2 • — 



0.1654 grm. of the oil gave 0.5161 grm. CO2 and 0.2233 grm. H2O. 



C 85.03 



H 15.00 



A combustion of the fraction 265°-270° gave values required for a 

 hydrocarbon of the series C„H2„+2 • — 



0.1750 grm. of the oil gave 0.5469 grm. COo and 0.2346 grm. H2O. 



C 85.21 



H 14.81 



In determining the molecular weight of this liydrocarbon at the boil- 

 ing point of benzol, the following result was obtained: — 



0.4190 grm. of the oil and 24.3 grms. benzol gave a rise in boiling point 

 of 0.126. 



Found. 



367 367 



