摘要
为改善CO_2-离子液体(ILs)制冷吸收体系热力学性质参数报道数据较少的缺陷,选择使用Soave(SRK)方程,Wong-Sandler(WS)混合法则和通用化学活度系数(UNIQUAC)模型对新型制冷吸收工质对CO_2结合1-乙基-3-甲基咪唑双三氟甲磺酰亚胺盐(CO_2-[emim][Tf_2N])体系的相平衡数据进行关联,可得CO_2-[emim][Tf_2N]制冷吸收剂体系的超额吉布斯自由能(G^E)、超额焓(H^E)等热力学性质。结果表明:CO_2-[emim][Tf_2N]制冷吸收剂体系的G^E和H^E均受温度、压力和CO_2液相摩尔分数的影响,G^E的变化范围为-878.774—-260.195 J/mol,H^E的变化范围为-296.532—-26.494 5 J/mol,由G^E,H^E均为负值可知混合过程放热,符合热力学变化规律,由此可知CO_2-[emim][Tf_2N]制冷吸收剂体系具有成为吸收制冷循环新工质的基本特征,为CO_2-[emim][Tf_2N]用于吸收式制冷体系提供了依据。
For the lack of data in thermodynamic properties of CO 2-ILs refrigeration absorption system,the Soave(SRK)equation,Wong-Sandler(WS)mixed rule and the model of the universal chemical activity coefficient(UNIQUAC)were used to associate the phase equilibrium data of the CO 2-[emim][Tf 2N]system,the excess Gibbs free energy(G E)and excess enthalpy(H E)of the CO 2-[emim][Tf 2N]absorption refrigeration system were obtained.The results show that the G E and H E of CO 2-[emim][Tf 2N]refrigeration system are affected by temperature,pressure and the molar fraction of CO 2.The G E is-878.774--260.195 J/mol,the H E is-296.532--26.494 5 J/mol.For the negative value of G E and H E,the mixing process is exothermic,in line with the thermodynamic change rule.Hence,the CO 2-[emim][Tf 2N]absorption refrigeration system has the basic characteristics of becoming new working pair for the absorption refrigeration cycle,providing a basis for CO 2-[emim][Tf 2N]used as absorption refrigeration system.
作者
何丽娟
黄艳伟
李虹琰
潘鹏
HE Li-juan;HUANG Yan-wei;LI Hong-yan;PAN Peng(Institute of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)
出处
《化学工程》
CAS
CSCD
北大核心
2018年第4期46-50,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(51566014
51106068)
内蒙古自然科学基金资助项目(2015MS0547)
