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目前,纤维素水解产生可发酵糖的效率很低,是纤维素-乙醇转化的瓶颈问题.拟以化学改性的方法改变纤维素结晶结构从而提高其水解效率.首先以三聚氰氯(TCT)、苯胺为原料,合成2-氯-4,6-二苯氨基-1,3,5-三嗪(DACT),通过红外光谱、核磁共振谱图表征其结构.将DACT用于微晶纤维素羟基的修饰,并将修饰后的纤维素于50℃、固液比为1∶20(W/V)比为条件下用70 wt%硫酸水解60 min,研究DACT用量对纤维素结晶结构和水解性能的影响.水解实验结果表明DACT的相对物质的量的百分含量(以葡萄糖环计)为30%左右时,改性纤维素经酸催化水解后还原糖得率最高,广角X射线衍射证实该水解结果可归因于化学改性令纤维素的结晶结构发生变化,利于纤维素水解产生可发酵糖.
At present, the efficiency of cellulase hydrolysis to produce fermentable sugars is very low, which is the bottleneck of cellulose-ethanol conversion.It is proposed to modify the crystalline structure of cellulose by chemical modification to improve its hydrolysis efficiency.Firstly, using cyanuric chloride (TCT ) And aniline as starting materials, the structure of 2-chloro-4,6-diphenylamino-1,3,5-triazine was synthesized and its structure was characterized by FTIR and NMR spectra. The hydroxyl groups of the modified cellulose were hydrolyzed with 70 wt% sulfuric acid for 60 min at 50 ℃ and the ratio of solid to liquid was 1:20 (W / V) Hydrolysis results show that when the relative content of DACT (in terms of glucose ring) is about 30%, the yield of reducing sugar is the highest after acid-catalyzed hydrolysis of modified cellulose, while wide angle X-ray diffraction Confirmed that the hydrolysis results can be attributed to the chemical modification of the crystalline structure of cellulose changes, which will help cellulose hydrolysis produce fermentable sugar.