Huang Guolin, Shi Jeffrey X, Langrish Tim A G
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia.
Bioresour Technol. 2007 Apr;98(6):1218-23. doi: 10.1016/j.biortech.2006.05.002. Epub 2006 Jun 22.
The mechanisms and kinetics of NH(4)OH-KOH mixture pulping rice straw were studied. When aqueous ammonia was mixed with a small amount of caustic potash (ratio of 1:5), three distinct delignification phases were observed in the pulping process: a bulk delignification phase from the beginning of the cooking period to 100 degrees C, a supplementary delignification phase from 100 degrees C to 155 degrees C lasting a further 45 min, and a residual delignification phase until the end of the cooking period. There were two silica removal phases; the first phase was from the beginning of the cooking period to 100 degrees C and the second phase was from 100 degrees C to the end of the cooking period. The rate of delignification reaction was first order with respect to residual lignin and 0.3 order with respect to [OH(-)]. The silica removal was pseudo-first-order with respect to residual silica and 0.6 order with respect to [OH(-)]. The activation energies of the delignification and removal of silica reactions were 35.6 and 30.9 kJ/mol, respectively.
研究了氢氧化铵-氢氧化钾混合液蒸煮稻草的机理和动力学。当氨水与少量苛性钾混合（比例为1:5）时，在蒸煮过程中观察到三个不同的脱木素阶段：从蒸煮开始到100℃为大量脱木素阶段，从100℃到155℃持续45分钟为补充脱木素阶段，直到蒸煮结束为残余脱木素阶段。有两个二氧化硅去除阶段；第一阶段是从蒸煮开始到100℃，第二阶段是从100℃到蒸煮结束。脱木素反应速率对残余木素为一级反应，对[OH⁻]为0.3级反应。二氧化硅去除对残余二氧化硅为拟一级反应，对[OH⁻]为0.6级反应。脱木素和二氧化硅去除反应的活化能分别为35.6和30.9 kJ/mol。
