Phase Equilibria in Hydrogen Binary Mixtures From 63 to 280 K and Pressures to 6000 Bars

1983 ◽  
Vol 22 ◽  
Author(s):  
William B. Streett ◽  
Andreas Heintz ◽  
Paulette Clancy ◽  
Dhanraj Chokappa
Keyword(s):  
Binary Mixtures ◽  
Critical Line ◽  
Phase Region ◽  
Pressure Curve ◽  
Heavy Component ◽  
Liquid Equilibrium ◽  
Liquid Phases ◽  
Vapor Pressure Curve ◽  
Solid Liquid ◽  
First Time

ABSTRACTExperimental measurements have been carried out to determine the compositions of coexisting gas and liquid phases for binary mixtures of hydrogen with the following substances as the second component: nitrogen, carbon monoxide, argon, methane, ethylene, ethane and carbon dioxide. For most of these mixtures the entire region of gas-liquid equilibrium has been explored for the first time. This region is bounded in pressure-temperature space by the vapor-pressure curve of the heavy component, the gas-liquid critical line (where gas and liquid phases become identical) and the 3-phase region solid-liquid-gas. In all of the systems described here the latter two lines intersect to form a critical end point. The general qualitative features of these phase diagrams are described, and compared to those of helium mixtures studied earlier.

Binary mixtures of fatty acid ethyl esters: Solid-liquid equilibrium

2016 ◽  
Vol 427 ◽  
pp. 1-8 ◽  
Author(s):  
Laslo A.D. Boros ◽  
Marta L.S. Batista ◽  
J.A.P. Coutinho ◽  
M.A. Krähenbühl ◽  
Antonio J.A. Meirelles ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Binary Mixtures ◽  
Fatty Acid Ethyl Esters ◽  
Ethyl Esters ◽  
Liquid Equilibrium ◽  
Solid Liquid

Phase Behavior and Its Effects on Reactions in Liquid and Supercritical Carbon Dioxide

2004 ◽  
Author(s):  
Lynnette A. Blanchard ◽  
Gang Xu
Keyword(s):  
Carbon Dioxide ◽  
Melting Point ◽  
Vapor Pressure ◽  
Phase Behavior ◽  
Critical Point ◽  
Pressure Curve ◽  
Light Component ◽  
Vapor Pressure Curve ◽  
Solid Liquid ◽  
Liquid Vapor

Carbon dioxide, either as an expanded liquid or as a supercritical fluid, may be a viable replacement for a variety of conventional organic solvents in reaction systems. Numerous studies have shown that many reactions can be conducted in liquid or supercritical CO2 (sc CO2) and, in some cases, rates and selectivities can be achieved that are greater than those possible in normal liquid- or gas-phase reactions (other chapters in this book; Noyori, 1999; Savage et al., 1995). Nonetheless, commercial exploitation of this technology has been limited. One factor that contributes to this reluctance is the extremely complex phase behavior that can be encountered with high-pressure multicomponent systems. Even for simple binary systems, one can observe multiple fluid phases, as shown in Figure 1.1. The figure shows the pressure–temperature (PT) projection of the phase diagram of a binary system, where the vapor pressure curve of the light component (e.g., CO2) is the solid line shown at temperatures below TB. It is terminated by its critical point, which is shown as a solid circle. The sublimation curve, melting curve, and vapor pressure curve of the pure component 2 (say, a reactant that is a solid at ambient conditions) are the solid lines shown at higher temperatures on the right side of the diagram; that is, the triple point of this compound is above TE. The solid might experience a significant melting point depression when exposed to CO2 pressure [the dashed–dotted solid/liquid/vapor (SLV) line, which terminates in an upper critical end point (UCEP)]. For instance, naphthalene melts at 60.1 °C under CO2 pressure (i.e., one might observe a three-phase solid/liquid/vapor system), even though the normal melting point is 80.5 °C (McHugh and Yogan, 1984). To complicate things even further, there will be a region close to the critical point of pure CO2 where one will observe three phases as well, as indicated by the dashed–dotted SLV line that terminates at the lower critical end point (LCEP). The dotted line connecting the critical point of the light component and the LCEP is a vapor/liquid critical point locus.

Modeling the Solid-Liquid Equilibrium of Binary Mixtures of Triacylglycerols using UNIFAC and Predictive UNIQUAC models

2021 ◽  
pp. 113327
Author(s):  
Ericsem Pereira ◽  
Débora Tamires Vitor Pereira ◽  
Antonio J.A. Meirelles ◽  
Guilherme J. Maximo
Keyword(s):  
Binary Mixtures ◽  
Liquid Equilibrium ◽  
Solid Liquid

Prediction of Solid + Liquid Equilibrium Diagrams for Binary Mixtures Forming Solid Solutions with an Extremum

1982 ◽  
Vol 19 ◽  
Author(s):  
Witold Brostow ◽  
M. Antonieta Macip
Keyword(s):  
Binary Mixtures ◽  
Solid Solutions ◽  
Intermolecular Potentials ◽  
Gibbs Function ◽  
Liquid Equilibrium ◽  
Regular Solutions ◽  
Interatomic Distances ◽  
Organic Mixtures ◽  
Coexisting Phases ◽  
Solid Liquid

ABSTRACTConvenient methods of correlation and prediction of S+L diagrams exist only for systems forming eutectics. To deal with solid solutions, we have adopted the model of strictly regular solutions of Guggenheim [3–5]. Our key assumption is that values of the Gibbs function of interchange w are different in the two coexisting phases: wS and wL. The assumption is based on the fact that the average interatomic distances R are also different, and this affects the averages of the interatomic (or intermolecular) potentials. The input parameters are enthalpies and temperatures of melting of pure components and any pair of experimental points on the diagram. For a number of binary alloy systems the agreement with the experiment is good. Since we believe in the basic unity of materials (see Chap. 1 in [7]), calcuations have also been made for organic mixtures, again with good results.

Sign in / Sign up

Export Citation Format

Share Document