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Flow Toolkit for Measuring Gas Diffusivity in Liquids.

Jisong Zhang1,2, Andrew R Teixeira2,3, Haomiao Zhang2

  • 1The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering , Tsinghua University , Beijing 100084 , China.

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Accurately measuring gas diffusivity in liquids is essential for complex reactions. A new high-throughput flow method using a tube-in-tube reactor provides precise diffusion coefficient measurements with less than 5% deviation.

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Area of Science:

  • Chemical Engineering
  • Physical Chemistry
  • Materials Science

Background:

  • Accurate gas diffusivity in liquids is crucial for modeling multiphase reaction systems.
  • Existing methods for measuring gas diffusivity can be complex or time-consuming.

Purpose of the Study:

  • To develop and validate a novel high-throughput flow concept for measuring gas diffusivity in liquids.
  • To enable precise and efficient determination of diffusion coefficients.

Main Methods:

  • Utilized a tube-in-tube reactor with a semipermeable membrane (Teflon AF-2400) for gas-liquid mass transfer.
  • Employed coupled pseudosteady-state flux balances and a continuously ramped liquid flow rate.
  • Integrated a single gas flow meter for real-time measurements.

Main Results:

  • The method accurately measures gas diffusivity in liquids.
  • Demonstrated less than 5% deviation compared to established techniques.
  • The in situ measurement approach proved effective.

Conclusions:

  • The presented high-throughput flow concept offers a precise and efficient method for determining gas diffusivity in liquids.
  • This technique is valuable for characterizing multiphase reaction systems.
  • The method's accuracy and simplicity make it a promising tool for researchers.