Economic Feasibility Analyses 

 HCI (30%) 



HCI (>40%) 



3573 



WOOD, 



> PREHYDROLYSIS 



XYLOSE 

 ACETIC ACID 



i 



CELLULOSE 



LIGNIN 



FURFURAL 

 REACTOR 



FURFURAL 

 ACETIC ACID 



> HYDROLYSIS 



HCI 

 RECOVERY 



HCI 



■♦►LIGNIN 



GLUCOSE 



FERMENTATION 



~1~ 



ETHANOL 



i 



DISTILLATION 



1.0 TON (2000 LBS.) 

 WOOD 

 (O.D. WEIGHT) 



ANHYDROUS 

 ETHANOL 



TOTAL INTERMEDIATE PRODUCTS 



0.88 TON 

 UNRECOVERED COMPONENTS AND 



PROCESS LOSSES 0.24 TON 



Figure 28-37.— (Top) Simplified process flow sheet for hydrolysis of wood with super- 

 concentrated hydrochloric acid (HCI). (Bottom) Material balance for a wood hydroly- 

 sis plant, based on 1.0 ton of bark-free wood from southern hardwoods, ovendry- 

 weight basis. The process can handle wood with bark attached, but resulting product 

 mix will be different. (Drawings after Nguyen and Goldstein 1981.) 



