Province of Santa Clara, Cuba. 



443 



California naphtha, besides 3 per cent nitrogen bases, has 6' 5 

 per cent unsaturated hydrocarbons. 



The California petroleums do not contain hydrocarbons of 

 the series C n H 2n+2 .* The source of the 62° naphtha cannot be 

 determined, but it in all probability contains both paraffins 

 and naphthenes. The Cuban oil evidently is not composed 

 entirely of naphthenes, which are characterized by higher 

 gravity and index of refractions, nor yet of paraffins. 



To further investigate its composition, a fractional distilla- 

 tion was made, with an 18-column Young dephlegmator con- 

 densing with an ice-salt mixture. 









Table VI. 









Fraction Distillation Cuban Oil. 





Temperature 





% 



Specific gravity 



N D 0° 



N D 25° 



-30° 





1-6 



0'589 0°/4 ° 



1-3706 





30°-35° 





0-5 





1-3703 







35°-50° 





0-3 





1-3772 





50°-65° 





1-0 







1-3905 





65°-75° 





3-6 



0-685 



1-3975 



1-3860 



75°-85° 





3'8 



0-7266 20°/20 c 



1-4140 



1-4020 



85°-95° 





6'8 



0*7270 



1-4155 



1-4032 



95°-105° 





19-2 



0-7308 



1-4172 



1-4061 



105°-115° 





7*2 



0-7387 







1-4112 



115°-125° 





17-2 



0-7392 







1-4121 





Us 



ing a 



Jf-bulb JTempel fractionator. 





125°-135° 





6-8 



0-7477 







1-4162 



135°-]45° 





7-2 



0-7517 







1-4181 



Residue 





8-1 



0-7768 







1-4302 



Fraction -30°. 



Sp. 



gr. 0-589 (0°/4°), 



N D 0° 



1-3706. n- 



Butane boils 



at 



1°, 1 



betram ethyl methane 



at 10°: 



dimethyle- 



thylmethane at 30°, with sp. gr. 0*6385 (14°). This fraction 

 must be composed of paraffin hydrocarbons as must also 



Fraction 30° — 35° N D 0° 1-3703 



Fraction 35° — 50° N D 0° 1-3772 ; calc. N D 25° 1-365 



n-Pentane boils at 38° and has a refractive index of 1-3649 ; 

 trimethylethylmethane boils at 49'6° and N D 25'5°=l-3602. 

 This fraction also, by its index, is composed only of paraffin 

 hydrocarbons. 



Fraction 50°-65°. 3ST D 0° 1-3905 ; calc. N" D 25° 1-379. Di- 

 iso-propyl boiling at 58° has N D 25°=l-3648. The index here 

 is slightly high for pure paraffins. 



Fraction 65°-75°. Sp. gr. 0-685 (0°/4°), N D 25°=l-3860. 



* Richardson, VI International Congress of Applied Chemistry, iv-a, 243. 



