36 



BULLETIN 983, U. S. DEPARTMENT OF AGRICULTURE. 



the steam consumption in cooking is greatly decreased. Second, 

 there is difficulty in obtaining a juice sufficiently concentrated to 

 ferment and distill economically, because, if an excess of liquor is 

 present in the digester, a large portion of the sugar is dissolved 

 therein. Third, there is difficulty in handling a dripping, digested 

 sawdust from which the acid liquor must be separated. The follow- 

 ing table shows the results obtained by decreasing the ratio of 4 

 parts of water to 1 of dry wood down to equal parts of each. 



120 



100 



80 



60 



40 



< 

 AC 



3 



a 20 



K\J5% 



Vo 



ACI 



b"v 



12 3 4 5 6 



YIELD OF ALCOHOL IN Vo OF DRY WEIGHT OF WOOD 



10 



Fig. 5.— Series III and Ilia, showing variation in alcohol with varying cooking periods at two different 

 acid concentrations, Cooking pressure, 7.5 atmospheres. 



Series IV. 

 Water to wool ratio variable; 1.80 to 1.83 per cent of H«S0 4 ; 7.5 atmospheres; minute. 



Cook No. 



26 

 21 

 22 

 34 

 30 



Per cent 

 H 2 0. 



400 

 300 

 250 

 125 

 100 



Per cent 

 of total 

 sugars. 



22.24 

 23.16 

 23.75 

 21.96 

 21.09 



Alcohol yields. 



Per cent 



of total 

 sugars fer- p pr „ pnt 

 mentable. ' 1 



dry wood. 



56.19 

 54.87 

 55.31 

 59.29 

 60.68 



6.154 

 6.096 

 6.648 

 6.805 

 6.440 



Gallons 

 absolute 

 per ton. 



18.61 

 18.44 

 20.11 

 20.58 

 19.48 



Series IVo. 

 1.40 per cent of H^SO^ 7-5 atmospheres; minute. 





Per cent 

 H 2 0. 



Per cent 

 of total 

 sugars. 



Per cent 

 of total 

 sugars fer- 

 mentable. 



Alcohol yields. 



Cook No. 



Per cent of 

 dry wood. 



Gallons 

 absolute 

 per ton. 



43 



200 

 100 



21.84 

 23.00 



57.94 

 57.16 



6.369 

 6.665 



19.62 



44 



20.16 







