摘要:
Solid biomass having a moisture content in a range of 30 to 95 mass % is brought into contact with ammonia gas at a pressure in a range of 0.5 to 4 MPa and held at 50 to 200 degrees C. Subsequently, the solid biomass is rapidly decompressed to be blasted. The ammonia gas evaporated by decompression is recovered and recycled. The ammonia gas can be brought into contact with the entire solid biomass evenly and in a short time. Since absorption heat of the ammonia gas is generated, energy consumption required for additional heating can be reduced.