44 



WOOD TURPENTINES. 



for the proportion of pine oil present, might be compared. It was 

 decided therefore to separate this crude into about 2 per cent heads, 

 88 per cent hearts, and 10 per cent tails, and thus obtain a refined 

 turpentine with more heavy oils than No. 2, the other steam distilled 

 turpentine which was refined. 



DISTILLATION. 



The crude turpentine was run into the still at the rate of 24.8 

 gallons per hour. The speed of the heads varied from 0.2 to 1.0 



I 



iuso 



ty 



1 



0160 165 170 175 160 185 190 195 

 O.86 .87 .88 .89 30 31 32 33 

 9 1468 L470 1472 W74 1476 U78 1480 



FIG. 35. Boiling point, specific 

 gravity, and index of refraction 

 curves for crude turpentine No. 4. 



160 165 170 175 180 185 190 195 

 O6 7 6 .89 90 91 -92 33 

 Q 1468 1470 1472 1.474 1476 1478 U80 



FIG. 36. Boiling point, specific 

 gravity, and index of refraction 

 curves for " heads " obtained in 

 refining of crude turpentine No. 4. 



gallon per hour with an average of about 0.5 gallon per hour, and the 

 hearts varied from 20 to 23 gallons per hour with an average of about 

 21.7 gallons per hour. 



PRODUCTS. 



HEADS. 



The analysis of the heads from this run (fig. 36) showed the 

 presence of only a very small amount of material that differed from 

 the main portion of the turpentine. The first fraction of 1.5 per cent 

 had a slightly lower index of refraction than any of the rest, and the 



