48 



WOOD TURPENTINES. 



the first 10 per cent of the distillate contains a small amount of 

 material with properties somewhat different from the rest of the 

 distillate, and this was further indicated by the odor of the first 

 fractions. As with turpentines No. 2 and No. 4, however, it is 

 probable that there is so little of this material present that it is not 

 only impracticable but unnecessary to attempt its separation. 



HEARTS. 



The hearts (fig. 43) are seen to be almost free from heavy oils, 

 only about 2 per cent of material with a gravity of 0.890 being 



100 



90 



80 



70 



50 



u 



r 



30 



20 



160 165 170 175 180 185 190 195 

 O .86 .87 8 39 91 9\ 9Z 93 

 O 1468 1470 U72 IATA 1476 U78 U80 



FIG. 43. Boiling point, specific 

 gravity, and index of refraction 

 curves for " hearts " obtained in 

 refining of crude turpentine No. 5. 



L&GE ND 



O SFfECIF C G 2, 



ee 



175' 180- IBS* 190- 19? 20CT 205* 

 Off, BT 8 89 90 31 3Z 

 1/172 1474 U76 W78 M80 MC2 U64 



FIG. 44. Boiling point, specific 

 gravity, and index of refraction 

 curves for " tails ' ; obtained in 

 refining of crude turpentine No. 5. 



present, and the low gravity and index of the residue indicating that 

 even this 2 per cent is largely composed of substances similar to the 

 last few fractions of the distillate. A very nearly complete separa- 

 tion of hearts free from tails was therefore accomplished in this run. 



TAILS. 



The tails, however, are seen (fig. 44) to contain probably 15 per 

 cent of hearts material, so that the separation of tails free from 

 hearts was not complete. 



