The invention discloses a method for producing
ethanol by using lychee dregs as raw materials. The method comprises the following steps of: a,
drying and crushing fresh lychee dregs, and screening with a 30-mesh screen; b, immersing the obtained lychee dreg
powder with water of which the weight is 3-6 times that of the lychee dreg
powder; adjusting the pH value to 4.0-4.8; based on the weight of the lychee dreg
powder, adding 30-60U / g of
cellulase and 15-20CBU / g of beta-
glucosidase; performing enzymolysis at 45-50 DEG C for 3-5 hours; and filtering; c, based on the weight of the filtrate, adding 0.08-0.12% of
urea, and sterilizing at 110-120 DEG C for 10-15 minutes; and d, based on the volume of the filtrate, adding 4.5-5.5% of
saccharomyces cerevisiae seed liquid; performing sealed
fermentation for 70-75 hours in an environment with temperature of 30-36 DEG C and
humidity of 75-85%; and distilling and collecting to obtain the
ethanol. Through the method, the carbohydrates in the lychee dregs can be sufficiently used, and the yield of the
ethanol can reach about 8.1kg of ethanol per 100kg of lychee dregs; the
pollution and
discharge are reduced through comprehensive utilization of the lychee dregs; the
energy consumption is reduced; and the method has a wide prospect.