【摘 要】
：
Room temperature (about 16 ℃) pretreatment of pubescens by AlCl3 aqueous solution with different concentrations was studied.In the presence of 20 wt％ AlCl3 for pretreatment within 24 h,the degradation of hemicellulose reached 19.5 wt％ without obvious degr
【机 构】
：
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichu
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Room temperature (about 16 ℃) pretreatment of pubescens by AlCl3 aqueous solution with different concentrations was studied.In the presence of 20 wt％ AlCl3 for pretreatment within 24 h,the degradation of hemicellulose reached 19.5 wt％ without obvious degradation of cellulose and lignin (2.7 wt％ and 2.4 wt％,respectively).The extracted hemicellulose from pubescens could be divided into two parts,i.e.,small molecular weight products (saccharides and carboxylic acid,which occupy approximately 28.2％) and oligomers (approximately 71.8％).Low concentration of AlCl3 (＜10 wt％) slightly promoted the formation of oligomers with molecular weight in the range of 200-1000Da,while high concentration of AlCl3 (10-20 wt％) promoted the formation of oligomers in the molecular weight range above 20,000 Da.The conversion of hemicellulose with acceptable selectivity resulted in the cleavage of bond between hemicellulose and lignin yielding three classical Lignin-Carbohydrate complexes.
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