摘要
测定了离子液体N-乙基吡啶四氟硼酸盐([EPy]BF4)+有机盐[丁二酸钠(CH2COONa)2/柠檬酸铵C6H5O7(NH4)3/柠檬酸钠C6H5O7Na3]+水双水相体系在303.15、308.15和313.15K下的双节线及系线数据。基于相图中的杠杆定律通过质量法研究双水相体系的系线,并用Othmer-Tobias方程、Bancroft方程等经验方程以及NRTL活度系数模型对数据进行关联。采用有效排除体积和Setschenow-type的拟合参数深入研究三种有机盐的盐析能力。结果表明,双节线的三个经验式拟合效果良好,但较多参数的经验式会导致部分参数失去意义;双水相体系的系线满足经验方程,数据可靠性较好,且均方根偏差表明系线数据很好地符合NRTL模型;低温更有利于该双水相体系的形成;三种盐都能和[EPy]BF4离子液体形成双水相体系,且C6H5O7Na3的盐析能力更优。本文提供的数据为离子液体的回收循环利用提供了理论参考依据。
The binodal curve and tie-line data of N-ethylpyridinium tetrafluoroborate([EPy]BF4)+organic salts[sodium succinate((CH2COONa)2)/ammonium citrate(C6H5O7(NH4)3)/sodium citrate(C6H5O7Na3)]ionic liquid-based aqueous two-phase systems have been studied.The tie-line data were determined using gravimetric method based on the lever rule.Then,the Othmer-Tobias,Bancroft equations and NRTL model were used to fit the data.The effective excluded volume of salt and Setschenow-type equation were used to investigate the salting-out ability of the three salts.As a result,all the three empirical equations fit the binodal curves well,but some redundant parameters may be meaningless.The tie-lines data were satisfactory correlated to the equations,and show that the data is reliable.The root-mean-square deviation(RMSD)indicates tie-lines data fit NRTL model very well.The two-phase systems are easier to form at lower temperatures.All the three salts can form aqueous two-phase system with[EPy]BF4,and C6H5O7Na3 possesses stronger salting-out ability.The data provided in this article provides a theoretical reference for the recycling of ionic liquids.
作者
林绪亮
徐帅
徐少杰
袁慢景
陈金珠
李宇亮
秦延林
LIN Xuliang;XU Shuai;XU Shaojie;YUAN Manjing;CHEN Jinzhu;LI Yuliang;QIN Yanlin(School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,Guangdong,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Ministry of Education,School of Water and Environment,Chang’an University,Xi’an 710064,Shaanxi,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第11期5067-5079,共13页
CIESC Journal
基金
广东省自然科学基金杰出青年项目(2019B151502038)
国家自然科学基金项目(21706038,22078025,22078069)
长安大学研究生科研创新实践项目(300103703058)。
关键词
离子液体
相平衡
盐析
分离
双水相
ionic liquids
phase equilibrium
salting-out ability
separation
aqueous two-phase system
