合成了1-丁基3-甲基咪唑磷酸二丁酯和1-乙基3-甲基咪唑磷酸二乙酯两种磷酸酯类离子液,而且考察了SO2在其中的吸收/解吸特性。发现这两种离子液对SO2均有很好的吸收性能,在25℃、101kPa条件下其吸收容量高达每摩尔离子液吸收2.8mol和2.7mol SO2。此外,通过吸收/解吸实验发现其吸收容量没有明显变化,说明这类离子液对SO2的吸收有较好的稳定性。使用FTIR和1 H NMR对吸收SO2前后的离子液微观结构进行了表征,分析发现其对SO2的吸收是纯物理吸收。与本课题组之前所合成的[Bmim][PF6]和[Emim][BF4]相比,所合成的磷酸酯离子液有更高的吸收容量,这是因为离子液中磷酸盐阴离子(O=P-O)中氧原子上的自由电子与二氧化硫的路易斯酸性硫相互作用促进了吸收能力。
We undertook a pyrolysis research on garlic stalks to solve its difficulty in use. We found that the inorganic salts in biomass played an important role in catalytic pyrolysis. Moreover, we studied the pyrolysis behavior under catalyst and catalyst-free conditions. The results showed that the weightlessness rate of garlic stalks was the highest at 550 ℃ under catalyst-free condition. The oil production rate increased with the increase of temperature and reached the peak at 550 ℃. Subsequently, as the temperature increased, the secondary cracking was intensified and oil production rate was decreased. The oil production rate increased significantly （almost 15%） under catalysis of KOH. However, the oil production rate was the highest at 500-600℃. What＇s more, we found that KOH played a major role in promoting decomposition of surface skin cells and subcutaneous fibrous layer of garlic stalks.
