文献类型：期刊文献

英文题名：BINARY-LIQUID LIQUID EQUILIBRIA FROM A DOUBLE-LATTICE MODEL

作者：YING, H; LIU, HL; SOANE, DS; PRAUSNITZ, JM

机构：[1]UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DEPT CHEM ENGN, BERKELEY, CA 94720 USA;[2]UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA

年份：1991

卷号：67

起止页码：65

外文期刊名：FLUID PHASE EQUILIBRIA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1991GQ99900006)】；

语种：英文

摘要：Freed's lattice field theory is used to establish a double-lattice model for the Helmholtz energy of mixing for strongly non-ideal binary liquid mixtures. The coefficients of Freed's expansion terms are adjusted such that the calculated coexistence curve for the simple Ising lattice is in excellent agreement with that calculated from the Pade-approximant coefficients for spontaneous magnetization proposed by Scesney. For a variety of binary systems, two parameters (epsilon/k and r2) are obtained from experimental critical consolute points; here epsilon/k is the interchange energy and r2 is the number of lattice sites required by molecule 2, with r1 = 1. Calculated coexistence curves are generally in good agreement with experiment for fluid mixtures without specific (oriented) interactions, much better than those calculated using Flory-Huggins theory, especially near critical consolute points. Introducing a secondary lattice to account for highly oriented interactions (hydrogen bonding), requires an additional energy parameter delta-epsilon/k and an empirical parameter c10. With these parameters coexistence curves are fitted well for systems having a miscibility loop with both lower and upper critical solution temperatures.