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磷酸是潜在的预处理溶剂,可应用于以木质纤维素为原料来生产生物乙醇或生物基化学品的工厂.实验样品按下述方法准备:分别控制温度在30℃、50℃、70℃下,微晶纤维素溶解于浓度为83.03%的磷酸中;作用10小时,每隔30分钟取一次样.经X-射线衍射技术检测发现样品的结晶衍射峰显著降低,相应的结晶度也呈显著下降趋势.较高的温度可以促进纤维素在磷酸中的溶解,在较低的温度下,纤维素在磷酸中溶解的动力学行为遵循动力学方程:ln1/(1-Tt)kr.在温度30℃、50℃、70℃下,磷酸对纤维素解结晶反应的常数分别为0.059 5 h-1、0.165 0 h-1、0.116 3 h-1,活化能为42.40 kJ/moL.
Phosphoric acid is a potential pretreatment solvent and can be used in factories that produce bioethanol or bio-based chemicals using lignocellulose as raw materials.The experimental samples were prepared as follows: the temperature was controlled at 30 ° C, 50 ° C, 70 ° C , Microcrystalline cellulose was dissolved in the concentration of 83.03% phosphoric acid; role of 10 hours, taken once every 30 minutes like samples.X-ray diffraction analysis showed that the sample significantly reduced the diffraction peaks, the corresponding crystallinity was also significant The higher the temperature can promote the dissolution of cellulose in phosphoric acid, at a lower temperature, the kinetic behavior of the dissolution of cellulose in phosphoric acid follows the kinetic equation: ln1 / (1-Tt) kr at temperature The constants of the reaction of phosphoric acid with cellulose at 30 ℃, 50 ℃ and 70 ℃ were 0.059 5 h-1, 0.1665 h-1 and 0.116 3 h-1, respectively. The activation energy was 42.40 kJ / mol.