唑基离子液体的脱硫性能研究

Desulfurization performance of azole-based ionic liquids

为了研究在离子液体阴、阳离子上添加功能基团,达到更好地吸收SO_2的效果,以1,1,3,3-四甲基胍和三氮唑为原料,合成了三氮唑胍盐离子液体(简写为[TMG][Triz]),对其脱硫性能进行了系统研究,探讨了离子液体[TMG][Triz]的脱硫性能及脱硫机理。结果表明,离子液体[TMG][Triz]具有良好的脱硫及再生性能。在常压、20℃条件下,1mol离子液体[TMG][Triz]吸收2.964mol的SO_2;随着温度的升高,离子液体[TMG][Triz]的脱硫能力逐渐下降;摩尔吸收比随着SO_2分压的增加而增加;130℃条件下,对吸收饱和后的离子液体进行解吸,解吸率达到95%以上。研究表明,离子液体[TMG][Triz]对SO_2的吸收同时存在化学吸收和物理吸收2种作用,研究结果对提高烟气处理效率具有一定的参考价值。

In order to study the addition of functional groups in ionic liquid anion and cation to achieve better absorbing of SO2,the 1,1,3,3-tetramethylguanidine triazole（[TMG][Triz]）is synthesized using 1,1,3,3-tetramethylguanidine and triazole as raw materials.The desulfurization performance of the synthesized[TMG][Triz]is systematically studied.The desulfurization performance and desulfurization mechanism of the[TMG][Triz]are discussed.The results show that the[TMG][Triz]has good performance of desulfurization and regeneration.At the atmospheric pressure,1 mol of the[TMG][Triz]absorbs 2.964 mol of SO2 at 20 ℃.With the increase of temperature,the desulfurization capacity of the[TMG][Triz]decreases gradually.The molar absorption ratio increases with the increase of SO2 partial pressure,and under the conditions of 130 ℃,the desorption rate of the ionic liquid after saturated adsorption reaches over 95%.The mechanism investigation results show that the interaction of SO2 and[TMG][Triz]is the combination of chemical absorption and physical absorption.The results have a cer-tain reference value to improve the efficiency of flue gas treatment.