Solid–liquid–vapor phases of water and water–carbon dioxide mixtures using a simple analytical equation of state

2004 ◽  
Vol 222-223 ◽  
pp. 55-66 ◽  
Author(s):  
A. Yokozeki
Keyword(s):  
Carbon Dioxide ◽  
Equation Of State ◽  
Analytical Equation ◽  
Solid Liquid ◽  
Liquid Vapor

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.

Solid-liquid-vapor phase behavior of the methane-carbon dioxide system

AIChE Journal ◽  
1962 ◽  
Vol 8 (4) ◽  
pp. 537-539 ◽  
Author(s):  
J. A. Davis ◽  
Newell Rodewald ◽  
Fred Kurata
Keyword(s):  
Carbon Dioxide ◽  
Phase Behavior ◽  
Vapor Phase ◽  
Solid Liquid ◽  
Methane Carbon ◽  
Liquid Vapor

Application of a non-cubic equation of state to predict the solid-liquid-vapor phase coexistences of pure alkanes

2020 ◽  
pp. 1-13
Author(s):  
José Manuel Marín-García ◽  
Ascención Romero-Martínez ◽  
Felipe de Jesús Guevara-Rodríguez
Keyword(s):  
Equation Of State ◽  
Vapor Phase ◽  
Cubic Equation Of State ◽  
Cubic Equation ◽  
Solid Liquid ◽  
Liquid Vapor

Modeling natural gas-carbon dioxide system for solid-liquid-vapor phase behavior

2017 ◽  
Vol 45 ◽  
pp. 738-746 ◽  
Author(s):  
Mesude Ozturk ◽  
Sai R. Panuganti ◽  
Kai Gong ◽  
Kenneth R. Cox ◽  
Francisco M. Vargas ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Phase Behavior ◽  
Vapor Phase ◽  
Solid Liquid ◽  
Liquid Vapor

scholarly journals Equation of state to predict the solid-liquid-vapor phase coexistances of pure substances.

2020 ◽  
Vol 66 (5 Sept-Oct) ◽  
pp. 656
Author(s):  
J. M. Marín-García ◽  
A. Romero-Martínez ◽  
F. De J. Guevara-Rodríguez
Keyword(s):  
Equation Of State ◽  
Triple Point ◽  
Input Data ◽  
Acentric Factor ◽  
Point Temperature ◽  
Cubic Equation ◽  
Pure Substances ◽  
Solid Liquid ◽  
Triple Point Temperature ◽  
Liquid Vapor

A non-cubic equation of state is used to predict the solid-liquid, solid-vapor and liquid-vapor coexistences of pure substances. The equation of state is obtained using as input data the critical point, the boiling temperature, the triple point temperature and the acentric factor of the substance. In this work, some examples of phase diagrams predicted with the equation of state are reported in order to show its capabilities. Finally, a database with the parameters for different pure substances is presented.

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