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Related Concept Videos

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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Physical Properties of Alkanes02:33

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Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is minimal, and hence alkanes have a zero dipole moment. This leads to the presence of only dispersion forces between the molecules. The strength of dispersion forces is dependent on the surface area of the molecules on which they act. Since the surface area increases with the molecular length for straight-chain alkanes, the dispersion forces also...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
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Thermal Sigmatropic Reactions: Overview01:16

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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Thermodiffusion in multicomponent n-alkane mixtures.

Guillaume Galliero1, Henri Bataller1, Jean-Patrick Bazile1

  • 1Laboratoire des Fluides Complexes et leurs Réservoirs-IPRA, E2S, UMR5150, Univ Pau & Pays Adour/CNRS/TOTAL, 64000 Pau, France.

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Summary
This summary is machine-generated.

Thermodiffusion in hydrocarbon mixtures separates components, with lighter species moving to hot regions and heavier ones to cold. This phenomenon counteracts gravity, impacting oil and gas reservoir fluid distribution.

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Area of Science:

  • Geochemistry
  • Physical Chemistry
  • Petroleum Engineering

Background:

  • Compositional grading in hydrocarbon mixtures influences pre-exploitation evaluations.
  • Thermodiffusion, driven by geothermal gradients, causes species separation in reservoirs.
  • Measuring and modeling thermodiffusion in multicomponent mixtures remains challenging.

Purpose of the Study:

  • Investigate thermodiffusion in multicomponent n-alkane mixtures at high pressures.
  • Quantify the impact of thermodiffusion on initial fluid distribution in reservoirs.

Main Methods:

  • Experimental measurements of thermodiffusion in microgravity (Shi Jian 10 spacecraft) to prevent convection.
  • Molecular dynamics simulations to confirm experimental observations.
  • Analysis of condensate gas data to model reservoir fluid distribution.

Main Results:

  • Lightest and heaviest n-alkane species migrated to hot and cold regions, respectively.
  • Experimental trends were validated by molecular dynamics simulations.
  • Thermodiffusion was found to counteract gravitational segregation in idealized reservoir models.

Conclusions:

  • Thermodiffusion significantly influences the vertical distribution of species in reservoirs.
  • The effect of thermodiffusion can lead to unstable fluid columns.
  • Accurate thermodiffusion data for multicomponent mixtures are essential for evaluating initial reservoir fluid states.