Ghose T K, Pannir Selvam P V, Ghosh P
Biochemical Engineering Research Center, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi-110016, India.
Biotechnol Bioeng. 1983 Nov;25(11):2577-90. doi: 10.1002/bit.260251108.
The effects of moderate-temperature aqueous butanol pretreatment of rice straw on several organic catalysts have been studied. Maximum delignification was obtained with an aromatic organic acid catalyst. Presoaking of straw in aqueous improved delignification, particularly in high solid-liquid rations. However, due to the difficulty of penetration of lignin into the solvent phase, an increase in the solid-liquid ratio appears to affect delignification. A two-stage catalytic solvent process involving presoaking at 80 degrees C followed by delignification at 120 degrees C resulted in 83% removal of lignin in aqueous-butanol, whereas 75% lignin removal was possible in ethanol. Higher reduction in the crystallinity was possible with etanol. Lignin produced by the solvent process offers desirable physical properties for polymer applications compared to Kraft lignin.
研究了稻草中温水相丁醇预处理对几种有机催化剂的影响。使用芳香族有机酸催化剂可实现最大程度的脱木素。稻草在水中预浸泡可改善脱木素效果，尤其是在高固液比情况下。然而，由于木质素难以渗透到溶剂相中，固液比的增加似乎会影响脱木素。两阶段催化溶剂法，即先在80℃下预浸泡，然后在120℃下进行脱木素，可使水相丁醇中83%的木质素被去除，而在乙醇中则可去除75%的木质素。乙醇可使结晶度有更高程度的降低。与硫酸盐木质素相比，溶剂法生产的木质素在聚合物应用中具有理想的物理性能。
