MABERY. — SULPHUR PETROLEUMS. 55 



dilation of them repeated until they collected for the most part withia 

 well deliiied limits. The follovviug weights were collected as repre- 

 senting the quantities of these products in the twenty litres first 

 distilled : — 



The small quantities distilling at temperatures outside of the boiling 

 points of the well known hydrocarbons were not further examined, 

 since it was assumed that they were merely mixtures. The portion 

 collecting at 29°-30° in a vapor density determination gave 2.54 ; re- 

 quired for is opentane 2.49. 



A vapor density determination of the fraction 36°— 37° gave 2.66, 

 which corresponds to the composition of pentane, CgHig. 



Distillation of the portion — 10° was continued until 20 grams col- 

 lected between 7° and 8°. In a vapor density determination by the 

 method of Hofmann, the value 2.01 was obtained ; calculated for butane, 

 C^H^,, 2.01. A considerable portion of this oil collected below 5° ; 

 which consisted chiefly doubtless of the butane that boils at 0°. But 

 since this body has been identified no further attempts were made 

 to separate it more completely. Concerning the butane bulling at 8°, 

 what has been said of the same product separated from Ohio petro- 

 leum applies also here. It is evident from the weights collected of 

 these volatile hydrocarbons that they are present in much smaller 

 quantities than in Ohio petroleum. 



The distillate below 150° in vacuo was fractioned twelve times, col- 

 lecting at first within 5° limits, then within 2°, and finally within 1°, 

 with the aid of Warren condensers containing glass coils and Hempel 

 columns. At the end of the eighth distillation, the last seven under 

 atmospheric pressure, the lower distillates collected as follows, with 

 smaller quantities between these limits : — 



—55° 55°-60° 65°-69° 77°-83° 



Grams 8 25 40 65 



As was mentioned when considering the lower fractions of the Ohio 

 oil, these weights evidently represent only approximately the quan- 

 tities in the crude oil. 



After the eighth distillation, the fractions 55°-60° were further 

 purified, until 15 grams distilled constant at 60°-61°, bar. 749 mm., 

 and a vapor density determination of this product gave 2.96 ; required 

 for isohexane, 2.98. 



