Study on Ethanol Production by Solid Fermentation of Sweet Sorghum Stalk and Seeds

Sweet sorghum stalk (sugar content as 11 g/100 g) was used as raw materials to produce ethanol by solid fermentation and the relative procedures were as follows: stalk minced to 1～2 cm in size by mincing machine and seed grinded to 60 comminution degree, 30 min sterilization under 0.1 MPa, inoculation with 10 % yeast, then 48 h stable placement at 28 ℃. Alcohol content in fermented grains was above 5 g/100 g and the average yield of ethanol was 87.9 %. The addition of 20 % sorghum seeds for fermentation could achieve 89.5 % yield of ethanol and alcohol content could reach above 9 g/100 g after the fermentation.