TABLE I 

 Preliminary Alkali Extraction of Resinous Chips 



Experiment Number. 



1 2 3 4 5 6* 7 



Kind of Alkali Used. . . NaOHNaOHNaOHNaOHNaOHNaOHNa2CO3 

 Wt. of Resinous Chips- 

 Grams 2000 1000 1000 1500 1500 1500 1500 



Na2O Used Multiple 



of Theoretical Value. 3.2 1.6 2.17 4.34 3.47 3.0 3.26 



Volume of Liquor c.c. 7000 6000 5000 7000 7000 7150 7000 

 Strength of Liquor 



% Na2O 2.6 0.77 1.25 2.68 2.14 1.82 2.02 



Relieving Pressure 



Pounds Gage 20 30-40 25-30 25 15-20 15-20 30 



Time under Pressure 



Hours 3.5 3 4 3.75 4 3. 5 3. 5 



Crude Turpentine c.c. 113 86 93 139 145 145 128 

 Crude Turpentine 



Gals, per Cord 27.1 41.3 44.6 44.5 46.4 46.4 41.0 



Crude Turpentine 



Index of Refraction 



at 15C 1.47421.47421.47381.47411.47331.4742 



Crude Turpentine 



Specific Gravity at 



15C 0.87530.88540.88490.87430.87700.8774 



Dry, Extracted 



Chips (Rosin-free) 



% of Original Wood 44.8 41.2 40.8 41.7 48.1 



"Humus," Dis- 

 solved % of Actual 



Wood 17.5 24.1 24.8 23.2 11.4 



*Extraction of Smaller Chips. 



Discussion of Table I 



Table 1 contains most of the important data 

 bearing on the preliminary extractions. The rosin 

 determinations have been reserved for later discus- 

 sion (see Table 2.) 



In computing turpentine yield, a factor was 

 worked out for the transformation of volume in 

 cubic centimeters to gallons per cord. A yield of 

 1 c.c. from 100 grams of wood is equivalent to a 



, A . 4,000 

 production of = 4.8 gallons from a cord 



lUU X o.ooO 



of 4,000 pounds. The wood used probably weighed 

 considerably more than 4,000 pounds per cord, but 

 this figure has been chosen as a conservative esti- 

 mate for rich pine. 



The index of refraction was obtained by the use 

 of a Pulfrich refractometer. The readings were 

 made at room temperatures (17-23C.) and the 

 index at 15C. calculated. The positive correction 

 of 0.00047 per degree centigrade was used, in 

 accordance with the recommendation of the govern- 



37 



