二乙氧基甲烷+水+甲苯或对二甲苯三元体系的液液相平衡
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摘要
文章探讨了在常压下298.2和308.2 K时三元体系水+二乙氧基甲烷+甲苯和水+二乙氧基甲烷+对二甲苯的液液相平衡数据。根据实验数据对分配系数和分离因子进行了估算,其值均高于1,表明甲苯和对二甲苯作为萃取剂具有较好的萃取能力和较高的选择性;使用Othmer-Tobias和Hand经验方程来检验实验数据的准确性和可靠性,其线性相关的平方均大于0.990 0,表明数据具有较高的一致性;利用NRTL和UNIQUAC热力学模型对测量数据进行关联,相对均方根偏差(RMSD)均低于0.009 7,表明NRTL和UNIQUAC都能很好地关联三元体系的实验数据。
The liquid-liquid equilibrium(LLE) data about ternary systems of water-diethoxymethane-toluene and water-diethoxymethane-p-xylene were discussed at 298.2 K and 308.2 K under the atmospheric pressure. The partition coefficient and separation factor were estimated according to the experimental data, and their values were all greater than 1, indicating that toluene and p-xylene had better extraction ability and higher selectivity as extractant. Othmer-Tobias and Hand equations were utilized to validate the accuracy and reliability of the measured data. The linear correlation R~2>0.990 0, indicating that the data had a high consistency. Experimental LLE data were correlated with NRTL and UNIQUAC thermodynamic models, and all of RMSD values were below 0.009 7. The results show that the experimental data of each ternary system can agree well with NRTL and UNIQUAC models.
The liquid-liquid equilibrium(LLE) data about ternary systems of water-diethoxymethane-toluene and water-diethoxymethane-p-xylene were discussed at 298.2 K and 308.2 K under the atmospheric pressure. The partition coefficient and separation factor were estimated according to the experimental data, and their values were all greater than 1, indicating that toluene and p-xylene had better extraction ability and higher selectivity as extractant. Othmer-Tobias and Hand equations were utilized to validate the accuracy and reliability of the measured data. The linear correlation R~2>0.990 0, indicating that the data had a high consistency. Experimental LLE data were correlated with NRTL and UNIQUAC thermodynamic models, and all of RMSD values were below 0.009 7. The results show that the experimental data of each ternary system can agree well with NRTL and UNIQUAC models.
引文
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[13] LIU Hai,CUI Peng,LI Qinsong,et al.Experimental determination and correlation of liquid-liquid equilibria for water + cyclohexanone + solvents (toluene or p-xylene) ternary systems at 303.15 and 323.15 K under 101.3 kPa[J].J Chem Eng Data,2017,62:2367.
[2] OLEMAN M T,LEBLANC G.Use of diethoxymethane as a solvent for phase transfer-catalyzed O-alkylation of phenols[J].Organic Process Research & Development,2010,14(3):732-736.
[3] ZHANG Changhua,HE Jiuning,LI Youliang,et al.Ignition delay times and chemical kinetics of diethoxymethane/O2 /Ar mixtures[J].Fuel,2015,154:346-351.
[4] JIA Bing,XIN Kun,Yang Tengfei,et al.Measurement and thermodynamic modeling of ternary (liquid + li-quid) equilibrium for extraction of ethanol from diethoxymethane solution with different solvents[J].Journal of Chemical Thermodynamics,2017,111(6):1-6.
[5] 王春梅,顾正桂,李柏,等.二乙氧基甲烷-乙醇-水-甘油体系部分组分液液平衡[J].化学工程,2010,38(6):67-70.
[6] JIA Bing,XIN Kun,WANG Liping,et al.Experiments and thermodynamic models for ternary liquid-liquid equilibrium systems of diethoxymethane + ethanol + water system at different temperatures[J].Journal of Molecular Liquids,2017,242:907-912.
[7] RENON H,PRAUSNITZ J M.Local compositions in thermodynamic excess functions for liquid mixtures[J].Aiche Journal,1968,14(1):135-144.
[8] ABRAMS D S,PRAUSNITZ J M.Statistical thermodynamics of liquid mixtures:A new expression for the excess Gibbs energy of partly or completely miscible systems[J].Aiche Journal,2010,21(1):116-128.
[9] XIN Kun,SONG Yuhe,DAI Fangfang,et al.Liquid-li-quid equilibria for the extraction of furfural from aqueous solution using different solvents[J].Fluid Phase Equili-bria,2016,425:393-401.
[10] IUPAC.Evaluation of measurement data-Guide to the expression of uncertainty in measurement[J].Biotechniques,2008,100:1-120.
[11] OTHMER D,TOBIAS P.Liquid-liquid extraction data-The line correlation[J].Ind Eng Chem,1942,34:693-696.
[12] HAND D B.Dineric distribution[J].J Phys Chem,1929,34:1961-2000.
[13] LIU Hai,CUI Peng,LI Qinsong,et al.Experimental determination and correlation of liquid-liquid equilibria for water + cyclohexanone + solvents (toluene or p-xylene) ternary systems at 303.15 and 323.15 K under 101.3 kPa[J].J Chem Eng Data,2017,62:2367.