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首页> 外文期刊>Physics and Chemistry of Liquids >Experimental study of the PVTx relationship, L–L–V and L–V phase boundary of n-hexane + water mixtures near the upper and lower critical lines
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Experimental study of the PVTx relationship, L–L–V and L–V phase boundary of n-hexane + water mixtures near the upper and lower critical lines

机译：上临界线和下临界线附近的正己烷+水混合物的PVTx关系，L–L–V和L–V相界的实验研究

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摘要

PVTx relationship, three- (L–L–V) and two- (L–V) phase boundary properties (P_S; T_S, ρ_S) of n-hexane + water mixtures near the upper and lower critical lines, including UCEP, have been measured with a constant-volume piezometer technique. The lower and upper critical temperatures, T_C(x), the critical pressures, P_C(x) and the critical densities, ρ_C(x) for binary n-hexane + water mixtures were determined from the measured PVTx and phase boundary data near the critical points. The values of the Krichevskii parameter were determined from the directly measured P-x data along the critical isotherm-isochore of pure components (n-hexane and water) at the infinite dilution (x→0). The thermodynamic and structural properties of dilute n-hexane + water mixture near the critical point of pure solvents (water and n-hexane) were calculated using the Krichevskii parameter principle. The critical behaviour of the strongly singular properties (C_(PX), K_(TX)), in terms of the principle of isomorphism of critical phenomena in binary mixtures, was studied.
机译：PVTx关系，上下临界线（包括UCEP）附近的正己烷+水混合物的三（L–L–V）和两（L–V）相边界性质（P_S; T_S，ρ_S）已确定用定容测压技术测量。根据测量的PVTx和临界附近的相边界数据确定二元正己烷+水混合物的最低和最高临界温度T_C（x），临界压力P_C（x）和临界密度ρ_C（x）点。 Krichevskii参数的值是根据无限稀释（x→0）时纯组分（正己烷和水）的临界等温等温线的直接测量P-x数据确定的。使用Krichevskii参数原理计算接近纯溶剂（水和正己烷）临界点的稀正己烷+水混合物的热力学和结构性质。根据二元混合物中临界现象的同构原理，研究了强奇异性质（C_（PX），K_（TX））的临界行为。

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