ETHYL ALCOHOL FKOM WOOD WASTE. 



Series II. 

 125 per cent of H2O; 2.5 per cent H28O4; cooking time, 15 minutes. 



29 



Cook No. 



Pressure 

 (atmos- 

 pheres)". 



Yield of 



total 

 sugars. 



Per cent of 

 total sugars 

 ferment- 

 able. 



Alcohol 

 (per cent of 

 dry wood). 



58 



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 

 above but for 0, 10, and 20 minutes. The 15-minute cook was not made, but may easily be derived from 

 above series. 



the 

 the 



ID 



9 

 8 



CO 



u 



as 7 



X 

 0. 



b 



z 



OS * 

 3 

 CO 



CO 

 yj <* 



OS 

 CL 



2 



1 







































































































































































































































































2 4 6 8 1C 12 14 16 18 20 22 



YIELD IN % OF TOTAL SUGAR ON DRY WEIGHT OF WOOD 



24 



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 



