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研究了接近1atm、293~333 K条件下[C6mim][PF6]静态吸收二氧化碳的动力学特性,结果表明,温度和真空度对解吸效率有显著影响。363 K时该离子液体对吸收二氧化碳后解吸率达到66.67%,而真空条件下,室温时的解吸率就能达到95%。探讨了吸收-解吸循环使用次数及保存时间对该离子液体吸收-解吸二氧化碳性能的影响,发现吸收-解吸过程中[C6mim][PF6]的质量损失率低于0.05%,经过58次循环及约240天保存后,其吸收二氧化碳的容量和速率未发生明显改变。同时对其吸收过程的活化能及溶解焓等参数进行了拟合计算:Ea为5 836.93 J/mol,△H为10 957.66 J/mol。
The kinetic characteristics of [C6mim] [PF6] static uptake of carbon dioxide near 1atm and 293 ~ 333 K were investigated. The results show that the temperature and the degree of vacuum have a significant effect on the desorption efficiency. At 363 K, the desorption rate of the ionic liquid reached 66.67% after absorbing carbon dioxide, while under vacuum, the desorption rate reached 95% at room temperature. The effect of the number of absorption-desorption cycles and the storage time on the performance of the ionic liquid absorbing-desorbing carbon dioxide was investigated. It was found that the mass loss rate of [C6mim] [PF6] during adsorption-desorption was less than 0.05%. After 58 cycles After 240 days of storage, its capacity and rate of carbon dioxide uptake did not change significantly. At the same time, the parameters of activation energy and enthalpy of solution were fitted and calculated: Ea was 5 836.93 J / mol and △ H was 10 957.66 J / mol.