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Distillation: Vapor–Liquid Equilibria01:01

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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 physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Molecular Simulation of Vapor-Liquid Equilibria Using the Wolf Method for Electrostatic Interactions.

Remco Hens1, Thijs J H Vlugt1

  • 1Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft, The Netherlands.

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|September 28, 2018
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Summary

The Wolf method accurately simulates vapor-liquid equilibria for gases like carbon dioxide. This electrostatic calculation method offers a viable alternative to Ewald summation for VLE studies.

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Area of Science:

  • Computational chemistry
  • Thermodynamics
  • Physical chemistry

Background:

  • Simulating vapor-liquid equilibria (VLE) is crucial for chemical engineering.
  • Electrostatic interactions significantly influence VLE properties.
  • The Ewald summation method is a standard for calculating these interactions.

Purpose of the Study:

  • To assess the Wolf method's suitability for VLE simulations.
  • To compare the Wolf method with Ewald summation for accuracy.
  • To determine optimal Wolf method parameters.

Main Methods:

  • Monte Carlo simulations using the Continuous Fractional Component Gibbs Ensemble.
  • NPT simulations for saturated vapor pressure calculations.
  • Application of the Wolf method for electrostatic interactions.

Main Results:

  • The Wolf method accurately predicts densities, chemical potentials, and critical properties.
  • Simulation results show excellent agreement with literature data.
  • Optimal Wolf method parameters were identified.

Conclusions:

  • The Wolf method is a suitable alternative to Ewald summation for VLE calculations.
  • While requiring larger simulation boxes, it provides reliable electrostatic interaction calculations.
  • This method enhances VLE simulation capabilities in computational chemistry.