期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 82, 期 2, 页码 174-181出版社
WILEY
DOI: 10.1002/jctb.1648
关键词
lignocellulosic materials; ethanol; wet oxidation; pretreatment; enzymatic hydrolysis
Wet oxidation (WO) pretreatment of sugarcane bagasse, rice hulls, cassava stalks and peanut shells was investigated. WO was performed at 195 degrees C for 10 min, with 2 g kg(-1) of Na2CO3 and under either 3 or 12 bar of oxygen. Oxygen pressure and the type of raw material used had a major effect on the fractionation of the materials, formation of sugars and by-products, and cellulose enzymatic convertibility. Cellulose content in the solid fraction increased after pretreatment of all materials, except rice hulls. The greatest increase, from 361 g kg(-1) to almost 600 g kg(-1), occurred for bagasse. The solubilisation of individual components was different for each material. Bagasse xylan was solubilised to a large extent, and 45.2% of it was recovered as xylose and xylo-oligosaccharides in the liquid fraction. In the prehydrolysates of rice hulls around 40% of the original glucan was recovered as gluco-oligosaccharides, due to hydrolysis of starch contained in grain remains. The formation of by-products was modest for all the materials, but increased with increasing oxygen pressure. The highest yield of acetic acid (34-36 g kg(-1) of raw material) and furfural (0.7-1.8 g kg(-1)) occurred for bagasse. The pretreatment enhanced the enzymatic convertibility of cellulose giving the best result (670.2 g kg(-1)) for bagasse pretreated at the highest oxygen pressure. However, for the other materials the pretreatment conditions were not effective in achieving cellulose conversions above 450 g kg(-1). Some enzymatic conversion of xylan was observed.
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