甘蔗生产燃料乙醇工艺探索与应用

以固定化酵母作为发酵菌株,研究了甘蔗生产燃料乙醇的预处理、发酵工艺。获得了最适工艺参数：甘蔗经切断、撕裂、压榨机压榨和板框过滤后得到甘蔗汁,在甘蔗汁中加入1 U/mL的青霉素,发酵及酒母培养的pH值为3.5～4.0,添加0.01%的硫酸镁。32～35℃,发酵21 h,乙醇浓度达到9.5%vol左右,糖醇转化率在96%左右。采用单浓度双流加连续发酵工艺进行生产试验,与淀粉质及纤维质燃料乙醇工艺进行对比,结果表明,甘蔗生产燃料乙醇的连续发酵工艺在生产上是完全可行的,工艺路线简单,生产成本低,是目前最适于大规模推广的燃料乙醇生产工艺。

Study on the Production of Fuel Ethanol by Sugarcane

The pretreatment and fermentation process were studied in fuel ethanol production by sugarcane with immobilized yeast as fermenting strains.The optimum technical parameters were summed up as follows: sugarcane juice was obtained by cutting and tearing and pressing and filtering of sugarcane,and then it was added with 1U/ml penicillin,pH value in the fermentation and wine yeast culture was 3.5～4.0,0.01 % MgSO4 was added,and the optimum fermentation temperature was at 32～35 ℃,after 21 h fermentation,alcohol concentration reached up to 9.5 %vol,and the conversion ratio from sugar to alcohol was 96 %.Meanwhile,continuous fermentation process of sugarcane was compared with that of starch or cellulose.The results showed that continous fermentation of sugarcane was completely feasible in practice,which had the advantages of simple processing route and low production cost.It was the most suitable fuel ethanol production technology at present.