38 



WOOD TURPENTINES. 



crude turpentine No. 1, but the odor of the first fraction was quite 

 different from the second, and it was decided to separate a small 

 amount of heads in order to find if the odor of the hearts was im- 

 proved. This crude turpentine is seen to contain about 60 per cent 

 pinene, 8 per cent dipentene, and 32 per cent heavy oils. It was de- 

 cided to attempt to obtain about 4 per cent of heads, which would 

 leave about 64 per cent of turpentine material to be separated as 

 hearts. 



160" 165 170 175 180 185" I9O 195" 

 O .86 .87 .88 9 SO S\ 32 S3 

 O U68 UJ70 1472 U74 U76 1478 U&O 



FIG. 26. Boiling, specific gravity, 

 and index of refraction curves 

 for crude turpentine No. 2. 



160" 165 170 175 180 185 ' I9O 105 . 

 O Zb KJ S .89 50 .91 .92 .93 

 6 1468 WTO U17? 1414 1476 UH8 U80 



FIG. 27. Boiling point, specific 

 gravity, and index of refraction 

 curves for " heads " obtained in 

 refining of crude turpentine No. 2. 



DISTILLATION. 



The crude was run into the still at a speed varying from 24.8 to 

 25 gallons per hour ; the heads were kept as close as possible to 1 gal- 

 lon per hour (varying from 0.5 to 1.5 gallons per hour), and the 

 hearts varied from 15.7 to 16.1 gallons per hour. Except for the 

 rather large variation in the heads, the distillation seemed to run 

 smoothly. 



PRODUCTS. 



The analyses of the products are given in figures 27, 28, and 29. 



