442 Richardson and Mackenzie — Natural Naphtha from the 



Temperature 



#wt. 



Sp. 



gr. 20 o /20° 



N D 25° 



-50° 

















50°-75° 



1-2 









1-3830 



75°-100° 



20-0 





0*7029 



1-3956 



100°-125° 



51-9 





0-7286 



1-4061 



125°-150° 



24-6 





0-7462 



1-4168 



Residue 



9'2 









1-4282 



Practically all of the Cuban oil comes over between 75°- 

 150°, half between 100°-125°. The California naphthas boil 

 somewhat lower, a much larger part coming over 50°-100°. 

 The 88° naphtha boils, of course, very much lower, but the 62° 

 naphtha shows almost an identical composition by distillation, 

 the fraction 125°-150° alone being larger. 



Of the original oils, California 64*5°, 62°, and the Cuban oil 

 have the same gravities, though the California index of refrac- 

 tion is higher than the other two. 



A comparison of the different fractions is interesting. The 

 first found in all is 50°-75°. The Cuban oil has the highest 

 refractive index. The two California naphthas and the 6h° are 

 close together, while the 88° naphtha is lowest. In the portion 

 75°-100°, the Calif ornias are nearly equal to the Cuban, while 

 62° and 88° are respectively lower. The gravities do not differ 

 materially, but are in the same order from Cuban to 88°. 

 Fraction' 100°-125° shows a slight variation. 62° and 88° 

 indices are equal and lowest, Cuban is next, with California 

 highest. The gravities do not reveal anything, running Cal.- 

 Cuba-Cal.-62°. The highest fraction, 125°-150°, gives similar 

 constants for the Cuban and 62° naphthas, higher for the Cali- 

 fornia. 



It is hard to make a general summary of these comparisons. 

 The Cuban oil boils identically with 62° naphtha, but higher 

 than the California naphtha. The indices of refraction and 

 specific gravities of its fractions are nearest those of 62° 

 naphtha, but not as high as California naphtha. 



The action of reagents on the original oils was as follows : 



Removed by 





Cone. 



Fuming 



lOg NaOH 



33$ H 2 S0 4 



H 2 S0 4 



H 2 S0 4 



Cuban oil.-. 







0-76^ 



1*8* 



" fraction 145°- 





0-2 f 



2'5<fo 



Cal. naphtha "64-5°" ... 2-0^ 



2-9^ 



3-6 i 



2'9f 



62° naphtha __ T3$ 







i-3 i 



2-5 f 



The refractive indices in each case were not materially 

 changed. 



The Cuban oil has practically no unsaturated compounds, 

 even the 62° naphtha showing more action with acid, while the 



