NOVELTY - Lignocellulosic biomass and aqueous ammonia as substrate are mixed by batch process, to obtain substrate mixture. Lignin is dissociated from the substrate, or the substrate is swollen, and heated, to obtain ammonia-containing saccharification preprocessed material. Ammonia is separated and diffused from preprocessed material, dissolved in water to obtain aqueous ammonia, and aqueous ammonia is recovered while cooling and condensing ammonia diffused from preprocessed material. The ammonia is cooled using cooled thermal medium (b).    USE - Pre-processing method of biomass used for gasoline ethanol blended fuel as automotive fuel.    ADVANTAGE - The method economically and efficiently enables biomass.    DETAILED DESCRIPTION - Lignocellulosic biomass and aqueous ammonia as substrate are mixed by batch process, to obtain substrate mixture. Lignin is dissociated from the substrate at predetermined temperature and time, or the substrate is swollen, and heated at predetermined temperature, to obtain ammonia-containing saccharification preprocessed material. Ammonia is separated and diffused from preprocessed material, dissolved in water to obtain aqueous ammonia, and aqueous ammonia is recovered while cooling and condensing ammonia diffused from preprocessed material. While heating the substrate mixture using heated thermal medium (a) which heats this substrate mixture, by heat exchange with thermal medium (a) in a heat pump (19), and thermal medium (b) which collects the heat of dissolution at the time of making it dissolve in the water and at the time of condensing the ammonia. The ammonia is cooled using cooled thermal medium (b). Bypass circulation path (a) (15) which circumvents the portion which heats the substrate mixture to the circulation path (a) which makes the portion which heats the heat pump and substrate mixture circulate through thermal medium (a) and through which it makes the heat pump circulate. By making bypass circulation path (a) circulate through thermal medium (a), it heats from the predetermined temperature to high temperature. While carrying out the predetermined amount storage of the thermal medium (a) heated by high temperature from the predetermined temperature, the substrate mixture is heated with the thermal medium (a) heated by high temperature from the predetermined temperature until this substrate mixture reaches the predetermined temperature. Bypass circulation path (b) (48) which circumvents the portion which cools the ammonia to the circulation path (b) which makes the portion which cools the heat pump and ammonia circulate through thermal medium (b) and through which it makes the heat pump circulate. By making bypass circulation path (b) circulate through thermal medium (b), it cools at low temperature other than the temperature at the time of making circulation path (b) circulate through thermal medium (b). While carrying out the predetermined amount storage of the thermal medium (b) cooled by low temperature other than temperature when circulating circulation path (b), the concentration of ammonia diffused from ammonia-containing saccharification preprocessed material falls to a predetermined concentration. The ammonia is cooled with thermal medium (b) cooled by low temperature other than temperature when circulating circulation path (b) until the quantity of ammonia falls to a predetermined quantity.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of apparatus for pre-processing biomass.    Preprocessor (1)    Reaction container (2)    Ammonia condenser (3)    Bypass circulation paths (15,48)    Heat pump (19)