ETHYL ALCOHOL FROM WOOD WASTE. 



33 



purposes, therefore, there is no advantage in exceeding 7.5 atmos- 

 pheres (112 to 115 pounds per square inch gauge pressure), for above 

 this point decomposition of sugar sets in. The decomposition of 

 the fermentable sugars was apparently not so great as that of the 

 nonfermentable sugars, and the final alcohol yield was, therefore, not 

 greatly affected; but the increased amounts of volatile acids formed 

 are undesirable because of the possibility of an inhibiting action 

 during: fermentation. 



LENGTH OF TIME OF COOKING. 



When the pressure of 7.5 atmospheres was used as a constant, and 

 when the time of cooking was varied, the following results were 

 were obtained: 



Preliminary Series III. 



Time variable; 1.8 to 1.85 per cent of H2SO4; 400 per cent of H2O; 7.5 atmospheres. 





Time of 

 cook, min- 

 utes. 



Per cent of 



total 



sugars. 



Per cent of 



total 

 sugars fer- 

 mentable. 



Alcohol yields. 



Cook No. 



Per cent of 

 dry wood. 



Gallons ab- 

 solute per 

 ton. 



15 





 

 

 15 

 30 



22.59 

 22.70 

 23.16 

 22. 85 

 22.95 



1 54. 87 



6.096 





16 





21 1 





18 





17 









1 Cook 21 had 300 per cent water instead of 400 per cent. 



Series III. 

 Time variable; 2.50 per cent of H2SO4; 125 per cent of H2O2; 7.5 atmospheres. 





Time of 

 cook, min- 

 utes. 



Per cent of 



total 



sugars. 



Per cent of 



total 

 sugars fer- 

 mentable. 



Alcohol yields. 



Cook No. 



Per cent of 

 dry wood. 



Gallons ab- 

 solute per 

 ton. 



31 





 



21.45 



22.77 



63.66 

 62. 65 



6.859 

 6. 994 



20.75 



45 



21.15 













22. 11 



63.16 



6. 927 



20.95 







32 



10 

 10 



21.32 

 23 40 



69.79 

 67.27 



7.339 

 7.984 



22.20 



47 



24.15 









10 



22.36 



68.53 



7.662 



23.18 







46 



20 

 45 

 90 



23.61 

 21.56 

 18.06 



71.44 

 77.15 

 81.40 



8.537 

 8.295 

 7.387 



25.82 



56 



55 



25 09 

 22.34 



54976°— 22— Bull. 983- 



