In this study, deep eutectic solvents (DESs) were prepared using choline chloride as hydrogen bond acceptor (HBA) and ethylene glycol (EG) or glycerol (GLY) or urea (U) as hydrogen bond donor (HBD) and were evaluated as solvents in the extraction of benzene from n-hexane. Six of such solvents were prepared using different molar ratios of HBA: HBD and code named DES1, DES2, DES3, DES4, DES5 and DES6. Liquid–liquid equilibria (LLE) data for the ternary systems of n-hexane-benzene-DESs were measured at 303 K and 101.3 kPa. Solubility data and mutual solubilities between n-hexane and DES were measured using the traditional cloud point method. The tie lines were obtained using titration and refractive index measurements on both phases (n-hexane phase and DES-phases). The ternary systems exhibit type-1 phase behavior. The Othmer-Tobias and Hands equations were applied to examine the reliability of the LLE data. The tie-line data were correlated using the nonrandom two-liquid (NRTL) and universal quasichemical (UNIQUAC) thermodynamic models, and their corresponding binary interaction parameters were determined. The results show that the maximum separation factors were 31.24, 462.00, 15.24, 37.83, 174.60 and 126.00 for DES1, DES2, DES3, DES4, DES5 and DES6, respectively. The glycerol based DES (DES2 and DES5) show the highest separation factors and thus considered the most suitable for separating benzene from hexane. The regression coefficient for both Othmer-Tobias and Hand equations are higher than 0.99 for all DESs, indicating the reliability and consistency of the data. Both NRTL and UNIQUAC models adequately capture the experimental data.

在这项研究中，使用氯化胆碱作为氢键受体（HBA）和乙二醇（EG）或甘油（GLY）或尿素（U）作为氢键供体（HBD）制备了深共晶溶剂（DESs），并将其评估为溶剂从正己烷中萃取苯 使用不同摩尔比的HBA：HBD和代号DES1，DES2，DES3，DES4，DES5和DES6制备了六种此类溶剂。正己烷-苯-DESs三元体系的液-液平衡（LLE）数据在303 K和101.3 kPa下测量。使用传统的浊点法测量正己烷与DES之间的溶解度数据和互溶性。使用滴定和折射率测量在两个相（正己烷相和DES相）上获得连接线。三元系统表现出1型相行为。应用Othmer-Tobias和Hands方程来检验LLE数据的可靠性。使用非随机二液（NRTL）和通用拟化学（UNIQUAC）热力学模型对联系线数据进行关联，并确定它们对应的二元相互作用参数。结果表明，DES1，DES2，DES3，DES4，DES5和DES6的最大分离系数分别为31.24、462.00、15.24、37.83、174.60和126.00。甘油基DES（DES2和DES5）显示出最高的分离系数，因此被认为最适合从己烷中分离苯。对于所有DES，Othmer-Tobias和Hand方程的回归系数均高于0.99，这表明数据的可靠性和一致性。NRTL和UNIQUAC模型都可以充分捕获实验数据。