NOVELTY - Raw material of herbaceous plants (1) is pretreated (2) by pulverizing, irradiating ultrasonic wave, adding liquid containing alcohol, liquid ammonia and water, dilute alkali, stirring and heating. The organic liquid is recovered by washing the pretreated product and enzymatic hydrolysis (4) is performed using cellulose enzyme. Liquid Candida sp., Rhizopus oryzae and dried yeast are added to the hydrolyzed product and fermented (8). The fermented alcohol is purified by primary distillation and subsequent distillation using distilling tower.    USE - Conversion of herbaceous plant fiber to fuel alcohol.    DETAILED DESCRIPTION - Raw material of herbaceous plants (1) is pulverized into 100-180 mesh and placed into retort. Ultrasonic wave is irradiated in the pulverized material to loosen and separate the structural keys between the raw material fiber walls, and carbon dioxide is added. A liquid containing alcohol (30-40 wt.%), liquid ammonia (6-10 wt.%) and remaining water is added in an amount of 1.5-3 with respect to the raw material and liquid. Dilute alkali such as sodium hydroxide (3-12 wt.%) is added and stirred, and the mixture is heated to 100-250 degrees C at pressure of 2-6 MPa for 20 minutes-2 hours. The pressure is reduced to normal and temperature is reduced to 30-40 degrees C. The organic liquid is recovered by washing the product at high pressure and high temperature. Cellulose enzyme (0.5-3 wt.%) such as endo- beta -glucanase, exo- beta -glucanase and beta -glucosidase is added to the obtained mixture at 40-60 degrees C and pH of 3.0-6.0, and enzymatic hydrolysis (4) is performed for 8-12 hours. Liquid Candida sp., Rhizopus oryzae and dried yeast are added to the hydrolyzed product at 35-50 degrees C and pH of 3.0-6.0, and fermented (8) at 30-40 degrees C for 50-80 hours. Ammonium sulfate and phosphoric acid are further added during the fermentation process and the fermented mixture is purified by distillation when the tested alcohol concentration reaches 18-25 degrees . Subsequent distillation is performed using distilling tower when alcohol concentration reaches 35-50 degrees and ends until the alcohol concentration reaches 95 degrees . The cellulose enzyme further contains glycuronidase, acetylase, xylanase, beta -xylanase, galactomannan enzyme and glucomannan enzyme.    DESCRIPTION OF DRAWING(S) - The drawing shows the conversion process of herbaceous plant fiber to fuel alcohol. (Drawing includes non-English language text)    Raw material of herbaceous plants (1)    Pretreatment (2)    Plant lignocellulose material complex hydrolase (3)    Hydrolysis process (4)    Fermentation (8)