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Binary Diffusion Coefficients for Methane and Fluoromethanes in Nitrogen.

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|April 29, 2024
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Summary
This summary is machine-generated.

This study measured gas-phase diffusion coefficients for refrigerant-related fluoromethanes in nitrogen, providing crucial data for atmospheric and combustion models. Results show good agreement with prior studies, with new temperature dependencies reported for these compounds.

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Atmospheric Science

Background:

  • Binary gas-phase diffusion coefficients are vital for atmospheric and combustion chemistry models.
  • Refrigerant-related fluoromethanes are increasingly important in various industrial applications.

Purpose of the Study:

  • To measure binary gas-phase diffusion coefficients for methane, fluoromethane, difluoromethane, and trifluoromethane in nitrogen.
  • To investigate the temperature dependence of these diffusion coefficients over extended temperature ranges.
  • To compare experimental results with existing literature data and provide new insights.

Main Methods:

  • Reverse-flow gas chromatography was employed to determine diffusion coefficients.
  • Measurements were conducted across a wide temperature range (250 K to 723 K) for different species.
  • Diffusion coefficients for methane in air were also measured and compared to nitrogen.

Main Results:

  • Accurate diffusion coefficients were obtained for the homologous series of (fluoro)methanes.
  • New data extends the temperature range for difluoromethane and trifluoromethane diffusion measurements.
  • Measurements in air for methane showed excellent agreement with those in nitrogen.

Conclusions:

  • The study provides the first diffusion coefficient measurements for fluoromethane.
  • Results broadly agree with previous studies, but highlight differences in temperature dependence due to extended temperature ranges.
  • Findings support the use of reverse-flow gas chromatography for accurate diffusion coefficient determination.