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Related Concept Videos

Two Components: Liquid–Liquid Systems01:27

Two Components: Liquid–Liquid Systems

A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
A Single-Component System01:24

A Single-Component System

In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...

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High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
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Composition at the interface between multicomponent nonequilibrium fluid phases.

Kjetil B Haugen1, Abbas Firoozabadi

  • 1Department of Chemical Engineering, Mason Laboratory, Yale University, Room 103, New Haven, Connecticut 06520-8286, USA. kjetil.haugen@yale.edu

The Journal of Chemical Physics
|February 19, 2009
PubMed
Summary

Calculating interfacial composition in multicomponent systems is challenging. This study presents a new method using mass balance, revealing dependence on diffusion coefficients, unlike binary systems.

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Area of Science:

  • Chemical Engineering
  • Physical Chemistry
  • Thermodynamics

Background:

  • Accurate mass transfer calculations require interfacial composition.
  • Local thermodynamic equilibrium provides insufficient equations for multicomponent systems (M≥3).
  • Interfacial composition is unknown for M≥3, unlike binary systems (M=2).

Purpose of the Study:

  • To present a general and consistent method for computing interfacial composition in multicomponent systems.
  • To address the challenge of unknown interfacial compositions beyond binary systems.
  • To highlight the fundamental differences in interfacial composition calculation between binary and multicomponent systems.

Main Methods:

  • Utilizing mass balance across the interface as additional constraints.
  • Developing a general method applicable to multicomponent systems.
  • Comparing calculation results for binary and ternary (M=3) systems.

Main Results:

  • A novel method for computing interfacial composition in multicomponent systems is presented.
  • Interfacial composition in multicomponent systems depends on diffusion coefficients.
  • This dependence on diffusion coefficients is a key difference from binary systems.

Conclusions:

  • The developed method provides a consistent approach to determine interfacial composition in multicomponent systems.
  • Understanding the role of diffusion coefficients is crucial for multicomponent mass transfer.
  • The findings offer fundamental insights into nonequilibrium phase interactions.