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离子液体1-乙基-3-甲基咪唑醋酸盐([EMIM][A_C])广泛应用于化学分离过程,但其在高压下的比定压热容数据比较缺乏。本文基于流动型量热法建立了一套可适用于高压流体比定压热容测量的实验系统,温度、压力、比定压热容的扩展不确定度分别为0.05 K,13 kPa和0.98%。利用该实验系统对[EMIM][A_C]在T=(303~393)K、p=(0.1~16)MPa范围内的比定压热容进行了测量。基于测量结果,建立了一个可以精确计算[EMIM][A_C]比定压热容的新公式。
Ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM] [A_C]) is widely used in chemical separation processes, but its specific pressure-heat-mass capacity data at high pressure are relatively scarce. Based on the flow-type calorimetry method, a set of experimental systems that can be applied to high-pressure fluid specific heat capacity measurement are established. The extended uncertainty of temperature, pressure and specific heat capacity are 0.05 K, 13 kPa and 0.98% . The specific heat capacity of [EMIM] [A_C] in the range of T = (303 ~ 393) K, p = (0.1 ~ 16) MPa was measured by this experimental system. Based on the measurement results, a new formula was established to accurately calculate the [EMIM] [A_C] constant pressure heat capacity.