Method for preparing fuel ethanol from corn straws

The invention discloses a method for preparing fuel ethanol from corn straws, which comprises the following steps: carrying out enzymolysis on a cooked corn straw cellulose raw material, adding Angel high-temperature-resistant yeast into the prepared straw enzymatic hydrolysate to carry out low-sugar fermentation, starting to add the straw enzymatic hydrolysate when the total sugar concentration in the fermentation liquid is reduced to 0.7-1.1%, and the total sugar concentration in the fermentation liquid is maintained to be 2.2-3.2%. According to the invention, a low-sugar fermentation method is adopted for preparation, the period of ethanol fermentation is effectively shortened, the ethanol concentration is increased, and the sugar liquor conversion rate is increased, so that the comprehensive utilization rate of the corn straw cellulose raw material is effectively increased. 本发明公开了一种利用玉米秸秆制备燃料乙醇的方法，包括以下步骤：将蒸煮过的玉米秸秆纤维素原料进行酶解，制成的秸秆酶解液加入安琪耐高温酵母进行低糖发酵，当发酵液中的总糖浓度降至0.7-1.1％时开始添加秸秆酶解液，维持发酵液中的总糖浓度在2.2-3.2％。本发明采用低糖