CAJ | 학술논문

在温度为298～343 K,质量分数为10%～90%的条件下,使用BT2.15型Calvet微量量热仪测定了离子液体[Emim]Br水溶液的定压比热容数据,并建立了体系的比热容与温度和浓度的经验关联式,拟合的平均偏差为0.42%.通过比热容实验数据,计算了溶液体系的超额摩尔比热容,发现相对于理想溶液呈正偏差,并随着浓度和温度的增加而增大.
재온도위298～343 K,질량분수위10%～90%적조건하,사용BT2.15형Calvet미량량열의측정료리자액체[Emim]Br수용액적정압비열용수거,병건립료체계적비열용여온도화농도적경험관련식,의합적평균편차위0.42%.통과비열용실험수거,계산료용액체계적초액마이비열용,발현상대우이상용액정정편차,병수착농도화온도적증가이증대.
The heat capacities of the ionic liquid [Emim] Br (1-etbyl-3-methylimidazolium bromide) and its aque-ous solutions with concentrations of 10%-90% have been measured in the temperature range 298 K to 343 K using a Calvet microcalorimeter. An equation for the dependence of the heat capacity on temperature and concentration was derived. The average deviation between the values given by this equation and the experimental values was 0.42%. Based on the experimental data, the excess molar heat capacities (c_p~E) for the [Emim] Br aqueous solu-tions were calculated, and positive values were observed over the mole fraction range studied. The values of C_p~E were found to increase with increasing mole fraction and temperature.