ZHANG Jian, ZHANG Wen-xue, YANG Jian, YOU Ling, Kenji Kida, ZHANG Chao
This study supplied a reference on pretreatments of lignocellulosic materials for producing ethanol. Using rice straw or distillers' grains as feed stock,the pretreatment methods of diluted butanone solution,liquid ammonia,steam explosions,and the concentrated sulfuric acid hydrolysis were compared,and the detoxification methods of water washing and drying were discussed. The highest ethanol yields of the various pretreatment methods could appear,when the detoxification methods of drying,no detoxification,recovery of water washing,and neutralization followed the diluted butanone solution,liquid ammonia,steam explosions,and the concentrated sulfuric acid hydrolysis,respectively. Among them,using the diluted butanone solution explosion,the total sugar yields of distillers' grains and rice straw were 86% and 88% after enzymatic hydrolysis,and the highest ethanol yields were 25. 2 g /100g distillers' grains dry matter and 26. 3 g /100g rice straw dry matter,respectively. The diluted butanone solution explosion had higher ethanol yield than that of the liquid ammonia or steam explosions,but lower than that of the concentrated sulfuric acid hydrolysis. The study further cleared a novel pretreatment method of diluted solution explosions through comparisons,and offered a reference on choice of pretreatment methods for conversion of biomass energy.
