论文部分内容阅读
以三聚氯氰(TCT)、对羟基苯磺酸为原料,合成了水溶性的2,4-二(4-羟基苯磺酸钠)-6-氯-1,3,5-三嗪(DPHACT);通过红外光谱和质谱表征其结构。将DPHACT用于微晶纤维素(MCC)的修饰,并将修饰后的微晶纤维素于130℃、固液比为1∶20的条件下用8%(wt,质量分数,下同)H2SO4水解5h。研究DPHACT用量对纤维素微晶结构和水解性能的影响。实验结果表明,经DPHACT改性后的微晶纤维素水解后还原糖的得率有所提高,当DPHACT相对摩尔含量为6.25%时,微晶纤维素水解后还原糖的得率最大(12.42%);通过分析广角X射线衍射图发现,经DPHACT改性后,微晶纤维素的结晶结构发生了变化:无定形取含量增加,结晶指数下降,晶粒尺寸减小。
Using cyanuric chloride (TCT) and p-hydroxybenzenesulfonic acid as raw materials, a water-soluble 2,4-bis (sodium 4-hydroxybenzenesulfonate) DPHACT); its structure was characterized by IR and MS. DPHACT was used to modify microcrystalline cellulose (MCC), and the modified microcrystalline cellulose was treated with 8% (wt, mass fraction, same below) H2SO4 at 130 ℃ with solid to liquid ratio of 1:20 Hydrolysis 5h. The effects of DPHACT dosage on the structure and hydrolytic properties of cellulose microcrystals were investigated. The experimental results showed that the yield of reducing sugar after hydrolysis by DPHACT microcrystalline cellulose increased. When the relative molar content of DPHACT was 6.25%, the yield of reducing sugar after microcrystalline cellulose hydrolysis was the highest (12.42% ). By analyzing the wide-angle X-ray diffraction pattern, it was found that the crystal structure of microcrystalline cellulose changed after DPHACT modification: the amorphous content increased, the crystallinity index decreased and the grain size decreased.