[aP_(4443)][Gly]-H_2O两元体系物性测定及CO_2吸收性能

Property Measurement of [aP_(4443)][Gly]-H_2O Binary System and Its Absorption to Carbon Dioxide

采用两步法合成了双氨基功能化季鏻类离子液体3-丙胺基-三丁基鏻甘氨酸盐([aP4443][Gly])、3-丙氨基-三丁基鏻丙氨酸盐([aP4443][Ala])和3-丙氨基-三丁基鏻缬氨酸盐([aP4443][Val]),研究了[aP4443][Gly]与水构成的两元体系的粘度和电导率的变化.结果表明,在298.15～343.15K温度范围内,随阴离子烷基链增长离子液体粘度增大、电导率减小;随温度升高、含水量增加,[aP4443][Gly]-H2O两元体系的粘度减小、电导率增大.CO2吸收实验表明,添加水后离子液体[aP4443][Gly]对CO2的吸收速率均提高;当水摩尔分数小于0.50时,饱和吸收量增大;当水摩尔分数从0.50增大到0.75时,饱和吸收量减小,说明添加适量水可大幅改善[aP4443][Gly]吸收CO2的行为.

The viscosity and conductivity of 3-aminopropyl-tributylphosphonium aminoethanic acid salt（[aP4443][Gly]）,（3-aminopropyl）tributylphosphonium L-a-aminopropionic acid salt（[aP4443][Ala]）,and（3-aminopropyl）tributylphosphonium L-a-amino-4-methylvaleric acid salt（[aP4443][Val]）,and binary system of [aP4443][Gly]-H2O were investigated from 298.15 to 343.15 K respectively.It was found that the viscosity of these pure ionic liquids increased with the alkyl length,and the conductivity decreased.For the binary system with different water mole fractions of 0.00,0.25,0.50,0.75,either increasing water amount or temperature could lead to decrease in viscosity and increase in conductivity.As the mole fraction of water was less than 0.50,the saturated absorption of carbon dioxide kept increasing while decreasing between 0.50 and 0.75,which means that appropriate content of water could improve the absorption behavior.