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, aud Hiyama, crystalline solids separate from the higher 

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

 crude oil became solid on cooliug. 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 225° 

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

 230° melted at 70°, that from 250°-275° at 73°, and that from 260°- 

 265° at 74°. The solid from 22o°-230° gave, by combustion, values 

 showing it to belong to the series C„H 2n+2 . 



0.1535 grm. of the oil gave 0.4890 grm. CO, and 0.1787 grm. H 2 0. 



Calculated for r , 



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

 ing percentages by combustion, also showing the series C n H;>n+2 : — 



0.1654 grm. of the oil gave 0.5161 grm. CO, and 0.2233 grm. H 2 0. 



C 85.03 



H 15.00 



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

 hydrocarbon of the series C„H 2 «+2 : — 



0.1750 grm. of the oil gave 0.5469 grm. C0 2 and 0.2346 grm. H 2 0. 



C 85.21 



H 14.81 



In determining the molecular weight of this hydrocarbon 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. 



Calculated for C^H^. Found. 



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