NOVELTY - Production of concentrated alcohol solution from lignocellulosic feedstock comprises producing fermentable sugar solution comprising ammonium salts or combination of ammonium salts and ammonia; fermenting sugar solution to produce fermentation broth (20) comprising alcohol and greater than or equal to 1 g ammonium ions/kg fermentation broth; concentrating alcohol in fermentation broth by distillation; and reducing concentration of ammonia in alcohol-enriched vapor by acid addition, before or during distillation and then further concentrating alcohol present in alcohol-rich vapor by azeotrope breaking process.    USE - Method for production of concentrated alcohol solution from lignocellulosic feedstock (claimed).    ADVANTAGE - By removing or reducing concentration of ammonia to vapor feed, fouling can be reduced or prevented, which can improve the performance of molecular sieves and economic viability of process. By removing ammonia, the pH of alcohol may be lowered to within a range that meets industry standards. When molecular sieves are utilized, not only fouling of resin is reduced or prevented, but also the concentrated ethanol solution meets product specifications required by industry.    DETAILED DESCRIPTION - Production of concentrated alcohol solution from lignocellulosic feedstock comprises:    (A) producing fermentable sugar solution comprising ammonium salts or combination of ammonium salts and ammonia;    (B) fermenting sugar solution to produce fermentation broth (20) comprising alcohol and greater than or equal to 1 g ammonium ions/kg fermentation broth;    (C) concentrating alcohol in fermentation broth by distillation to produce alcohol-enriched vapor; and    (D) reducing concentration of ammonia in alcohol-enriched vapor by acid addition, before or during distillation and then further concentrating alcohol present in alcohol-rich vapor by azeotrope breaking process to obtain concentrated alcohol solution.    At least portion of fermentable sugar solution is produced by hydrolyzing lignocellulosic feedstock.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of a process for obtaining concentrated ethanol from lignocellulosic conversion process.    Fermentation broth (20)    Rectifying column (60)    Molecular sieve (125)    Reflux drum (130)    Phosphoric acid (135)