Zhang Jianmin, Zhang Suojiang, Dong Kun, Zhang Yanqiang, Shen Youqing, Lv Xingmei
Research Laboratory of Green Chemical Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, PO Box 353, Beijing 100080, P. R. China.
Chemistry. 2006 May 15;12(15):4021-6. doi: 10.1002/chem.200501015.
A new type of "task specific ionic liquid", tetrabutylphosphonium amino acid [P(C4)4][AA], was synthesized by the reaction of tetrabutylphosphonium hydroxide [P(C4)4][OH] with amino acids, including glycine, L-alanine, L-beta-alanine, L-serine, and L-lysine. The liquids produced were characterized by NMR, IR spectroscopies, and elemental analysis, and their thermal decomposition temperature, glass transition temperature, electrical conductivity, density, and viscosity were recorded in detail. The [P(C4)4][AA] supported on porous silica gel effected fast and reversible CO2 absorption when compared with bubbling CO2 into the bulk of the ionic liquid. No changes in absorption capacity and kinetics were found after four cycles of absorption/desorption. The CO2 absorption capacity at equilibrium was 50 mol % of the ionic liquids. In the presence of water (1 wt %), the ionic liquids could absorb equimolar amounts of CO2. The CO2 absorption mechanisms of the ionic liquids with and without water were different.
一种新型的“任务特定离子液体”，四丁基鏻氨基酸[P(C4)4][AA]，是通过氢氧化四丁基鏻[P(C4)4][OH]与包括甘氨酸、L-丙氨酸、L-β-丙氨酸、L-丝氨酸和L-赖氨酸在内的氨基酸反应合成的。所制备的液体通过核磁共振、红外光谱和元素分析进行表征，并详细记录了它们的热分解温度、玻璃化转变温度、电导率、密度和粘度。与将二氧化碳鼓泡通入离子液体本体相比，负载在多孔硅胶上的[P(C4)4][AA]实现了快速且可逆的二氧化碳吸收。经过四个吸收/解吸循环后，吸收容量和动力学未发现变化。平衡时的二氧化碳吸收容量为离子液体的50摩尔%。在有水（1重量%）存在的情况下，离子液体能够吸收等摩尔量的二氧化碳。有水和无水情况下离子液体的二氧化碳吸收机制不同。
