Solid-liquid phase equilibrium in the systems of LiBr-H2O and LiCl-H2O
Solid-liquid phase equilibrium in the systems of LiBr-H2O and LiCl-H2O
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DOI：
10.1016/j.fluid.2006.09.005
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发表时间：
2006-12-20
影响因子：
2.6
通讯作者：
Klomfar, J.
中科院分区：
文献类型：
--
作者：
Patek, J.;Klomfar, J.
本文给出了LiBr-H_2 O和LiCl-H_2 O体系固液平衡曲线的温度-摩尔分数经验表达式。这些表达式是基于一个机构的实验数据，已被编译和严格评估。该方程涵盖了LiCl-H_2 O体系的全部组成范围，以及LiBr-H_2 O的盐摩尔分数x = 0.46（即w = 0.805的质量分数）的组成，对应于从一水合物到无水物的转变。温度和溶液组成的共晶点和水合物之间的过渡点已确定从对应于相邻的水合物范围的相图的曲线的交点。采用了一种特殊结构的方程组，其中包括作为参数的过渡点的坐标，这使得它们的直接非线性优化成为可能。为了获得更可靠的结果，一个程序，同时优化的温度组成和组成温度方程。在所获得的值的转变点坐标的不确定性估计为I K的顺序为温度和0.001的盐摩尔分数表示的组合物。在数据库中的差距，给实验者未来的研究方向。(c)2006 Elsevier B. V.保留所有权利。
A set of empirical temperature-molar fraction expressions for solid-liquid equilibrium curves of LiBr-H2O and LiCl-H2O systems is presented. The expressions are based upon a body of experimental data that have been compiled and critically evaluated. The equations cover the full composition range for LiCl-H2O system and compositions up to the salt mole fraction of x = 0.46 (i.e. mass fraction of w = 0.805) for LiBr-H2O, corresponding to transition from monohydrate to anhydrate. Temperatures and solution compositions at the eutectic point and at transition points between hydrates have been determined from intersections of the curves corresponding to the adjacent hydrate ranges of the phase diagram. Equations of a special structure were used, involving the coordinates of the transition points as parameters, which makes possible their direct non-linear optimization. To obtain more reliable results, a procedure was employed optimizing both the temperature-composition and composition-temperature equations simultaneously. The uncertainty in the obtained values of the transition point coordinates are estimated to be of the order of I K for temperature and 0.001 for the composition expressed in salt mole fraction. Gaps in the database are shown to give experimenters orientation for future research. (c) 2006 Elsevier B.V. All rights reserved.