Sabine Wagenfeld, Wolffram Schröer and Bernd Rathke*,
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引用次数: 0
摘要
我们研究了乙腈(ACN)与正辛烷、正己烷、正庚烷和正癸烷的二元混合物的互溶性。与其他乙腈-烷烃混合物一样,这些体系也具有部分混溶性,并有一个上限(液-液)临界溶液温度(UCST),正辛烷的临界温度为 Tc = 364.37 K。对实验结果的详细分析以及对文献中已知数据的重新评估推定了伊辛临界性。此外,还详细解释了水对相行为的影响。液-液平衡(LLE)的新测量结果与文献数据的重新评估和分析相结合,旨在研究 ACN-正辛烷体系是否适合作为标准体系,推荐用于校准、评估和检查测定 LLE 的实验程序和方法。研究结果表明了使用这种混合物所面临的挑战。在干燥条件下对 ACN 的关键处理,以及在高温(T = ∼ 350-380 K)条件下对浊点温度的非简单测定,可能会使证明 LLE 结果的简便易行的程序落空或复杂化。ACN-n-hexane 系统在这方面更有前途。
Liquid-Liquid Phase Behavior of Acetonitrile and Normal Alkanes
The mutual solubilities of binary mixtures of acetonitrile (ACN) and n-octane, n-hexane, n-heptane, and n-decane are examined. Here, we report the liquid–liquid phase behavior of binary mixtures in the temperature range of T = 295–380 K. As other ACN–n-alkane mixtures, the systems possess a partial miscibility with an upper (liquid–liquid) critical solution temperature (UCST), for the case of n-octane at Tc = 364.37 K. A detailed analysis of the experimental results together with a re-evaluation of data known from the literature presumes Ising criticality. Complementarily, the influence of water on the phase behavior is explicated in detail. The aim of the new measurements of the liquid–liquid equilibria (LLE) combined with the re-evaluation and analysis of the data from the literature is to investigate if the ACN–n-octane system may be an appropriate candidate to serve as a standard system recommended for calibration, evaluation, and checking experimental procedures and methods for the determination of LLE. The results indicate challenges for using this mixture for that. The crucial handling of ACN at dry conditions together with the nontrivial determination of cloud point temperatures at elevated temperatures (T = ∼350–380 K) may foil or complicate an easy and handy procedure for proofing LLE results. The ACN–n-hexane system is more promising for this purpose.
期刊介绍:
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.