ETHYL ALCOHOL FROM WOOD WASTE. 
Series II. 
125 per cent of H2O; 2.5 per cent H2SO4; cooking time, 15 minutes. 
29 
58 
Cook No. 
Pressure 
(atmos- 
pheres). 
Yield of 
total 
sugars. 
Per cent of 
total sugars 
ferment- 
able. 
Alcohol 
(per cent of 
dry wood). 
6.0 
7.5 
9.0 
22.82 
23.50 
21.08 
60.48 
69.36 
78.90 
6.768 
(2) 
8.260 
57 
—8.222 
2 Not an actual cook. The data are interpolated from cooks Nos. 45, 46, and 47, which are similar to the 
above but. for 0, 10, and 20 minutes. The 15- minute cook was not made, but may easily be derived from th e 
above series. 
in 
in 
9 
8 
CO 
Hi 
02 7 
X 
Q. 
CO C 
b 
Z 
*s 
z 
u 4 
CO 
CO o 
UJ J 
OS 
0. 
2 
1 
- 
2 4 6 8 10 12 14 16 18 20 22 24 
YIELD IN % OF TOTAL SUGAR ON DRY WEIGHT OF WOOD 
Fig. 2.— Series lb, showing the variation of yield of total sugars with varying pressures of cooking. Cook- 
ing period, minutes (instantaneous). 
From the above results a maximum is observed in total sugar 
yields at 7.5 atmospheres gauge-pressure and the temperature cor- 
responding thereto, which was 174° C. or 344° F. Above this point 
decomposition set in, and if la series is compared with lb, it is seen 
that this decomposition was naturally much greater in the 15-minute 
cook than in the instantaneous (0-minute) cook. Below the above 
temperature, as was to be expected, the yield was not so great, 
because the speed of reaction and the yield of the final product is a 
function of the temperature. The higher the temperature the greater 
the speed of the reaction and the greater the yield in a given time, so 
