bmim］Zn2Cl5/NH3溶液的比热容和过量焓

doi:10.3976/j.issn.1002-4026.2016.02.010

山东科学 ›› 2016, Vol. 29 ›› Issue (2): 49-56.doi: 10.3976/j.issn.1002-4026.2016.02.010

bmim］Zn₂Cl₅/NH₃溶液的比热容和过量焓

陈伟¹，梁世强²*，郭永献²

1.青岛科技大学机电工程学院，山东青岛 266061; 2.中国科学院工程热物理研究所，北京 100190

收稿日期:2016-01-19 出版日期:2016-04-20 发布日期:2016-04-20
通信作者: 梁世强。Email:liangsq@iet.cn E-mail:liangsq@iet.cn
作者简介:陈伟（1986-），男，博士，研究方向为吸收式制冷。
基金资助:
国家自然科学基金（51276180）；山东省优秀中青年科学家科研奖励基金（BS2014NJ021）

Heat capacity and excess enthalpy of ［bmim］Zn₂Cl₅/NH₃ binary system solution

CHEN Wei¹,LIANG Shiqiang²*,GUO Yongxian²

1. School of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China;
2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Received:2016-01-19 Online:2016-04-20 Published:2016-04-20

摘要/Abstract

摘要：

测定了离子液体［bmim］Zn2Cl5在T=(323.15~1 173.15) K 范围内的热重曲线，结果显示［bmim］Zn2Cl5 在T<637.15 K时具有很高的热稳定性。通过DSC测试得到［bmim］Zn2Cl5的比热容数据，在T= (251.15~383.15) K 范围内可以用一个圆锥曲线很好地拟合。实验测定了［bmim］Zn2Cl5(2)+NH3(1)二元体系溶液的摩尔过量焓，其中氨的摩尔分数x1=(0.60~0.95)，温度值为T=288.15 K,303.15 K,318.15 K,333.15 K。采用NRTL模型对过量焓数据进行拟合，得出二元可调参数和非随机参数。过量焓数据的测量误差和最大拟合偏差分别小于 4.8% 和 4.3%。在［bmim］Zn2Cl5比热容和［bmim］Zn2Cl5/NH3过量焓数据的基础上，计算了氨质量分数w1 = (0 ~ 1)、温度范围T= (273.15 ~343.15) K条件下［bmim］Zn2Cl5/NH3溶液的焓，所得焓浓图对于研究［bmim］Zn2Cl5/NH3吸收式制冷系统性能至关重要。

关键词: 过量焓, ［bmim］Zn₂Cl₅/NH₃, 离子液体, NRTL模型, 比热容

Abstract:

We measured thermogravimetric curve for ionic liquid ［bmim］Zn₂Cl₅ at T= (323.15~1 173.15) K. Results show that ［bmim］Zn₂Cl₅ has higher thermal stability at T < 637.15 K. We acquired heat capacity data of ［bmim］Zn2Cl5 through DSC scan, which could be well fitted with a conic curve at T= (251.15~383.15) K. We measured mole excess enthalpy of binary system ［bmim］Zn₂Cl₅ (2) + NH₃ (1) for ammonia molar fractions x1 = (0.60 ~ 0.95) at T=288.15 K,303.15 K,318.15 K,333.15 K.We employed NRTL model to fit excess enthalpy data and acquired binary adjustable parameters and nonrandom parameters. Measurement error and maximum fitting deviation of excess enthalpy data are respectively less than 4.8% and 4.3%. Based on heat capacity of ［bmim］Zn₂Cl₅ and excess enthalpy data of ［bmim］Zn₂Cl₅/NH₃, we also calculated the enthalpy of ［bmim］Zn₂Cl₅/NH₃ solution for ammonia mass fractions of w1 = (0 ~1) and temperature scope T=(273.15 ~ 343.15) K. The obtained enthalpyconcentration diagram is essential to the investigation of the thermodynamic performances of ［bmim］Zn₂Cl₅/NH₃ absorption refrigeration system.

Key words: ionic liquid, ［bmim］Zn₂Cl₅/NH₃, NRTL model, heat capacity, excess enthalpy

中图分类号:

TB64

陈伟，梁世强，郭永献. bmim］Zn₂Cl₅/NH₃溶液的比热容和过量焓[J]. 山东科学, 2016, 29(2): 49-56.

CHEN Wei,LIANG Shiqiang,GUO Yongxian. Heat capacity and excess enthalpy of ［bmim］Zn₂Cl₅/NH₃ binary system solution[J]. SHANDONG SCIENCE, 2016, 29(2): 49-56.

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bmim］Zn₂Cl₅/NH₃溶液的比热容和过量焓

Heat capacity and excess enthalpy of ［bmim］Zn₂Cl₅/NH₃ binary system solution

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