【摘要】 由N,N-二甲基乙酰胺、氯化胆碱、乙二醇或丙三醇以不同的摩尔比(1:1:3,1:1:4)合成了一系列三元低共熔离子液体(nDMA:nCC:nethylene glycol=1:1:3,1:1:4,nDMA:nCC:nglycerol=1:1:3,1:1:4)。在293.15~323.15 K温度下,间隔10℃,0~600.0 k Pa压力范围内,用等温饱和法测量了CO2在三元体系中的溶解度。CO2在体系中的溶解度随压力增大呈线性增大趋势,随温度升高而减小。计算了亨利常数,结果表明,CO2在由N,N-二甲基乙酰胺,氯化胆碱,乙二醇以摩尔比1:1:3合成的三元体系,温度为293.15 K下,亨利常数最小,最小值为2.174 MPa·kg·mol-1。报道了关于CO2吸收的热动力学性质,包括焓变、熵变、Gibbs自由能变。其中,焓变为负值,说明此吸收为放热过程。更多还原

【Abstract】 A series of novel ternary deep eutectic solvents(TDESs) were synthesized from N,N-dimethyl acetamide(DMA), choline chloride(CC) and ethylene glycol or glycerol with different mole ratios(nDMA:nCC:nethylene glycol=1:1:3, 1:1:4, nDMA:nCC:nglycerol=1:1:3, 1:1:4). Solubilities of CO2 in TDESs were determined in the temperature range T=293.15—323.15 K with 10℃ intervals under pressure ranging from 0 to 600.0 k Pa using the isochoric saturation method. The solubility of CO2 in the liquids increased linearly with increasing pressure and decreased with increasing temperature. Henry’s constants were calculated, while TDES obtained from DMA, CC and ethylene glycol with mole ratio 1:1:3 showing the lowest value of 2.174 MPa·kg·mol-1 at 293.15 K. Thermodynamics of CO2 absorption were also calculated, including enthalpy, entropy, Gibbs free energy. The negative enthalpy demonstrated that the process was exothermic.更多还原