Industrial Chemistry Research Institute , Rydygiera 8 , 01-793 Warsaw , Poland.
Thermodynamic Research Unit, School of Engineering , University of KwaZulu-Natal , Howard College Campus, King George V Avenue , Durban 4041 , South Africa.
J Phys Chem B. 2018 Jun 14;122(23):6188-6197. doi: 10.1021/acs.jpcb.8b02500. Epub 2018 May 30.
Ionic liquids (ILs) are important new solvents proposed for applications in different separation processes. Herein, an idea of possible use of high pressure in a general strategy of production of 2-phenylethanol (PEA) is discussed. In this work, we present the influence of pressure on the density in binary systems of {1-hexyl-1-methylpyrrolidynium bis{(trifluoromethyl)sulfonyl}imide, [HMPYR][NTf], or 1-dodecyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide, [DoMIM][NTf] + PEA} in a wide range of temperatures (298.15-348.15 K) and pressures (0.1-40 MPa). The densities at ambient and high pressures are measured to present the physicochemical properties of the ILs used in the process of separation of PEA from aqueous phase. The Tait equation was used for the correlation of density of one-component and two-component systems as a function of mole fraction, temperature, and pressure. The influence of pressure is not significant. These systems exhibit mainly negative molar excess volumes, V. The solid-liquid phase equilibrium (SLE) of [DoMIM][NTf] in PEA at atmospheric pressure was measured and compared to the SLE high-pressure results. Additionally, the ternary liquid-liquid phase equilibrium (LLE) at ambient pressure in the {[DoMIM][NTf] (1) + PEA (2) + water (3)} at temperature T = 308.15 K was investigated. The solubility of water in the [DoMIM][NTf] is quite high in comparison with that measured by us earlier for ILs ( x = 0.403) at T = 308.15 K, which results in not very successful average selectivity of extraction of PEA from the aqueous phase. The [DoMIM][NTf] has shown strong interaction with PEA without the immiscibility region. The ternary system revealed Treybal's type phase equilibrium in which two partially miscible binaries ([DoMIM][NTf] + water) and (PEA + water) exist. From the results of LLE in the ternary system, the selectivity and the solute distribution ratio of separation of water/PEA were calculated and compared to the results obtained for the ILs measured earlier by us. The popular NRTL model was used to correlate the experimental tie-lines in ternary LLE. These results may help in a new technological project of "in situ" extraction of PEA from aqueous phase during the biosynthesis.
离子液体 (ILs) 是一种重要的新型溶剂，被提议用于不同分离过程的应用。本文讨论了在 2-苯乙醇 (PEA) 生产的一般策略中可能使用高压的想法。在这项工作中，我们研究了压力对 {1-己基-1-甲基吡咯啶鎓双（三氟甲磺酰基）亚胺，[HMPYR][NTf]，或 1-十二烷基-3-甲基咪唑鎓双（三氟甲磺酰基）亚胺，[DoMIM][NTf] + PEA} 在较宽温度范围（298.15-348.15 K）和压力（0.1-40 MPa）下的二元体系密度的影响。在环境压力和高压下测量密度，以呈现 ILs 在从水相分离 PEA 过程中的物理化学性质。使用 Tait 方程关联单一组分和双组分系统的密度作为摩尔分数、温度和压力的函数。压力的影响并不显著。这些体系主要表现出负的摩尔超额体积，V。在大气压下测量了 [DoMIM][NTf] 在 PEA 中的固液平衡 (SLE)，并将其与高压下的 SLE 结果进行了比较。此外，还在温度 T = 308.15 K 下研究了 {[DoMIM][NTf] (1) + PEA (2) + 水 (3)} 在环境压力下的三元液-液平衡 (LLE)。与我们早些时候在 ILs 中测量的结果相比（T = 308.15 K，x = 0.403），[DoMIM][NTf] 中水的溶解度非常高，这导致从水相中提取 PEA 的平均萃取选择性不是很成功。[DoMIM][NTf] 与 PEA 表现出强烈的相互作用，没有不混溶区域。三元体系表现出 Treybal 型相平衡，其中存在两个部分混溶的二元体系 ([DoMIM][NTf] + 水) 和 (PEA + 水)。从三元体系的 LLE 结果中，计算并比较了分离水/PEA 的选择性和溶质分配比，与我们早些时候测量的 ILs 的结果进行了比较。使用流行的 NRTL 模型关联三元 LLE 的实验 tie-line。这些结果可能有助于“原位”从生物合成过程中的水相提取 PEA 的新技术项目。
