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苎麻和红麻是我国传统纤维作物,皮部纤维在造纸、纺织等工业具有广泛用途,但剥皮后剩余的茎秆部分并没有被有效利用。由于其中含有较多纤维素,可望被生物转化生产燃料乙醇。比较了几种不同化学预处理方法对苎麻秆和红麻秆纤维素酶解性能的改善效果,进而选择碱法预处理后原料,进行半同步糖化发酵产乙醇实验。结果表明,苎麻秆和红麻秆经4%NaOH和0.02%蒽醌-2-磺酸钠盐(AQSS),在170℃下处理1 h,继而在固形物底物浓度18%时发酵168 h,发酵液中乙醇浓度达到51 g/L。采用少量多次补料至20%的底物浓度,乙醇浓度都能达到63 g/L,纤维素转化率分别为77%和79%。红麻秆经5.2%NaHSO3和0.2%H2SO4,在170℃下处理1 h,补料至20%的底物浓度时,乙醇浓度可达到65 g/L,纤维素转化率为72%。
Ramie and kenaf are the traditional fiber crops in our country. The skin fibers have a wide range of uses in paper making, textile and other industries. However, the remaining stems after skinning are not effectively used. As it contains more cellulose, it is expected to be bioconverted to fuel ethanol. The effects of several chemical pretreatment methods on the enzymatic hydrolysis of ramie stalk and kenaf stalk cellulose were compared, and then the raw materials were selected by alkali pretreatment to produce ethanol by semi-synchronous saccharification and fermentation. The results showed that ramie stalk and kenaf stalk were treated with 4% NaOH and 0.02% anthraquinone-2-sulfonic acid sodium salt (AQSS) at 170 ℃ for 1 h, then fermented at 18% solid substrate concentration for 168 h , Ethanol concentration in fermentation broth reached 51 g / L. A small amount of multiple feeding to 20% substrate concentration, ethanol concentration can reach 63 g / L, cellulose conversion rates were 77% and 79%. When the kenaf stalk was treated with 5.2% NaHSO3 and 0.2% H2SO4 at 170 ℃ for 1 h, the concentration of ethanol reached 65 g / L and the conversion of cellulose was 72%.