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离子液体1-乙基-3-甲基咪唑醋酸盐([EMIM][Ac])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][Ac]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][Ac]比定压热容的新公式.“,”Ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM][Ac]) is widely used in the process of chemical separation,but its cp data are scarce,especially in high pressure regions.A flow calorimeter is developed for the isobaric heat capacities of fluid at high pressure.The total uncertainties of temperature,pressure and isobaric heat capacity are estimated to be 0.05 K,13 kPa and 0.98％ respectively.Isobaric heat capacity of [EMIM] [Ac] was measured in the temperature range from 303 K to 393 K and from 0.1 to 16 MPa.Based on the experimental results,an accurate model is proposed for predicting the isobaric heat capacity of [EMIM] [Ac].