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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Reference Materials for Phase Equilibrium Studies. 1. Liquid-Liquid Equilibria (IUPAC Technical Report).

Ala Bazyleva1, William E Acree2, Robert D Chirico1

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Summary
This summary is machine-generated.

This study identifies seven reference systems for liquid-liquid equilibrium studies, crucial for validating phase equilibrium instruments and techniques. These systems cover common binary mixture categories, providing evaluated data for reliable research.

Keywords:
Instrument validationLiquid-liquid equilibriumPhase equilibriumReference materials

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Thermodynamics

Background:

  • Phase equilibrium studies are essential for chemical process design and optimization.
  • Accurate reference materials are needed to validate experimental techniques and instrumentation.
  • Existing reference systems may not cover the diverse range of mixture types encountered in research.

Purpose of the Study:

  • To propose a set of reliable reference systems for liquid-liquid equilibrium (LLE) studies.
  • To support the validation of instruments and techniques used in phase equilibrium research.
  • To provide critically evaluated data for common binary mixture categories.

Main Methods:

  • Literature review to identify relevant studies on binary mixtures.
  • Critical evaluation of available experimental data for selected systems.
  • Development of smoothing equations to represent the phase equilibrium data.
  • Estimation of uncertainties associated with the accepted data.

Main Results:

  • Seven binary mixture systems were selected for LLE studies.
  • The proposed systems represent four common categories: moderate aqueous solubility, non-aqueous, low solubility, and ionic liquid systems.
  • For each system, literature sources, accepted data, smoothing equations, and uncertainty estimates are provided.

Conclusions:

  • The proposed reference systems will aid in standardizing and validating LLE measurements.
  • This work provides a foundation for future development of reference materials in phase equilibrium studies.
  • The selected systems offer a valuable resource for researchers in physical chemistry and chemical engineering.