含有{氯化胆碱+葡萄糖或尿素}的水体系及其深共晶溶剂在298.15 K和85 kPa时的汽液平衡研究,Journal of Chemical & Engineering Data

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含有{氯化胆碱+葡萄糖或尿素}的水体系及其深共晶溶剂在298.15 K和85 kPa时的汽液平衡研究
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2019-04-24 , DOI: 10.1021/acs.jced.9b00076
Mohammed Taghi Zafarani-Moattar ₁ , Hemayat Shekaari ₁ , Fariba Ghaffari ₁

Affiliation

在这项工作中，为了研究在298.15 K和大气压下含有{氯化胆碱+葡萄糖}和{氯化胆碱+尿素}的水系统的气液平衡（VLE），使用改进的等渗方法测量了水活度。所获得的水分活度线表明，这些体系与半理想溶液具有负偏差，因此溶质-溶质相互作用是有利的。根据测得的水活度数据，计算渗透系数值，并使用多项式方法拟合这些数据，从而确定三元和二元溶液中尿素或葡萄糖的活度系数。由这些活度系数计算得出的转移吉布斯能量值对于尿素或葡萄糖从含氯化胆碱的二元水溶液到三元水溶液的转移是负的，再次表明氯化胆碱与尿素或葡萄糖之间有利的相互作用。此外，还对包含氯化胆碱+葡萄糖或尿素的两种合成的深共晶溶剂（DESs）和相同摩尔比的相应混合物进行了比较等度研究，并添加了不同量的水以研究稀释对共晶溶剂的影响。在298.15 K时，这些DES中存在氢键相互作用。使用测得的水活度和水质量分数值研究稀释后这些相互作用的减弱，发现两个DES中两个组分之间的氢键相互作用消失了约75％（g / g）的水。

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Vapor–Liquid Equilibria Study of the Aqueous Systems Containing {Choline Chloride + Glucose or Urea} and Their Deep Eutectic Solvents at 298.15 K and 85 kPa

In this work, to study the vapor–liquid equilibria (VLE) for the aqueous systems containing {choline chloride + glucose} and {choline chloride + urea} at 298.15 K and atmospheric pressure, water activity was measured using the improved isopiestic method. The obtained water activity lines showed that these systems have negative deviation from the semi-ideal solution, and therefore solute–solute interactions are favorable. From the measured water activity data, osmotic coefficient values were calculated and the polynomial method is used to fit these data from which activity coefficients of urea or glucose in ternary and binary solutions were determined. The transfer Gibbs energy values calculated from these activity coefficients were negative for the transfer of urea or glucose from binary to ternary aqueous solutions containing choline chloride, indicating again favorable interaction between choline chloride and urea or glucose. In addition, a comparative isopiestic study was made on the two synthesized deep eutectic solvents (DESs) containing choline chloride + glucose or urea and corresponding mixtures with the same molar ratios, with the addition of different amounts of water to investigate the effect of dilution on the existing hydrogen bonding interactions in these DESs at 298.15 K. The measured water activity and water mass fraction values were used to study the weakening of these interactions by dilution, and it was found that the H-bonding interaction between two components of both DESs disappears at around 75% (g/g) of water.

更新日期：2019-05-24

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