EXCESS-ENTHALPIES FOR (PROPANE PLUS METHANOL) AT THE PRESSURE 5 MPA AND THE TEMPERATURES (253.15, 258.15, 263.15, AND 273.15) K - THE EFFECT OF WATER AS AN IMPURITY ON THE (LIQUID PLUS LIQUID) EQUILIBRIA IN (PROPANE PLUS METHANOL)

被引：5

作者：

SIPOWSKA, JT ^{[1
]}

OTT, JB ^{[1
]}

WOOLLEY, AT ^{[1
]}

MARCHANT, BG ^{[1
]}

GRUSZKIEWICZ, MS ^{[1
]}

机构：

[1] BRIGHAM YOUNG UNIV,DEPT CHEM,PROVO,UT 84602

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 1993年 / 25卷 / 08期

关键词：

D O I：

10.1006/jcht.1993.1095

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Excess molar enthalpies HEm are reported for {xC3H8 + (1-x)CH3OH} at the pressure 5 MPa and the temperatures (253.15, 258.15 263.15, and 273.15) K. The experimental results are compared with earlier measurements at higher temperatures from which it is shown that HEm and the temperature coefficient CEp. m are much smaller at these lower temperatures. No linear regions in the HEm (x) curves were found at any of these temperatures, indicating that the upper critical solution temperature (UCST) is below 253.15 K. However, addition of mass fraction 5·10-3 of H2O to the methanol resulted in (liquid + liquid) phase separation at T = 253.15 K, suggesting that the much higher UCST reported earlier may have been due to water contamination of the methanol. © 1993 Academic Press Ltd.

引用

页码：999 / 1004

页数：6

共 10 条

[1] (LIQUID+LIQUID) PHASE-EQUILIBRIA IN (METHANOL+BUTANE) AND (METHANOL+PENTANE) AT PRESSURES FROM 0.1 TO 140 MPA [J].