甘蔗渣活性氧固体碱蒸煮的脱木素动力学

Delignification Kinetics of Active Oxygen Solid Base Cooking of Bagasse

中文关键词:  甘蔗渣  活性氧固体碱蒸煮  脱木素  动力学

Key Words:bagasse  active oxygen solid base cooking  delignification  kinetics

中文摘要:

      探讨了甘蔗渣活性氧固体碱蒸煮的脱木素过程及脱木素动力学。通过建立合适的动力学模型，求出相关的动力学参数。研究结果表明，升温阶段的50～140℃为初始脱木素阶段，140～170℃为大量脱木素阶段。在高温条件下进行保温时，80 min内木素脱除较快，保温时间超过80 min后，木素脱除不明显。氧脱木素对脱木素反应的级数为1.30,H2O2用量对脱木素反应的级数为0.044,氧压对脱木素反应的级数为0.32,反应活化能为98.57 kJ/mol，指前因子为1.12×109。

Abstract:

      The delignification process in active oxygen solid base cooking of bagasse and its kinetics were researched.The parameters in the established model were calculated. The research result showed that the cooking temperature from 50℃ to 140℃ in the temperature rising period was the initial lignin removal stage, while the bulk lignin removal stage was from 140℃ to 170℃ in the temperature rising period.The lignin removal was quite fast in the first 80 min when the temperature maintained at the maximum temperature, however delignification was not obvious after 80 min.The reaction order fitted was 1.30 for kappa number, 0.044 for H2O2 concentration, and 0.30 for oxygen pressure, respectively.The activation energy E was 98.57 kJ/mol and factor A was 1.12×109.