FTIR as a Powerful Tool for Measurements of Diffusion in Supercritical Carbon Dioxide Using Taylor Dispersion Method

A new experimental high-pressure setup for measuring diffusion coefficients in supercritical fluids, based on Taylor dispersion method, and using an FTIR detector to operate up to 25.0 MPa was designed and optimized. Tracer diffusivities, D12, of toluene and benzene in supercritical carbon dioxide w...

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Bibliographic Details
Published in:Processes 2022-08, Vol.10 (8), p.1528
Main Authors: Santos, Cecilia I. A. V., Barros, Marisa C. F., Faro, Maria P. R. T., Shevtsova, Valentina, Ribeiro, Ana C. F.
Format: Article
Language:English
Subjects:
Benzene
Carbon dioxide
Diffusion
Diffusion coefficient
Emissions
Flow velocity
Geology
Hydrocarbons
Industrial plant emissions
Mathematical models
Measurement
Methods
Pressure
Sensors
Supercritical fluids
Temperature dependence
Toluene
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Summary:A new experimental high-pressure setup for measuring diffusion coefficients in supercritical fluids, based on Taylor dispersion method, and using an FTIR detector to operate up to 25.0 MPa was designed and optimized. Tracer diffusivities, D12, of toluene and benzene in supercritical carbon dioxide were measured in the temperature range of 306.15–320.15 K, and pressure range of 7.5–17 MPa to evaluate the setup and experimental protocol. The effects of flow velocity, volume of the cell, absorbance at different wavenumbers on the diffusion coefficient as well as all parameters respecting the Taylor dispersion method have been analyzed. The obtained diffusion coefficients are in excellent agreement with the available literature data. The dependence of D12 on temperature, pressure, and solvent density were examined. Some correlation models based on the hydrodynamic theory were used to estimate the diffusion coefficients in supercritical carbon dioxide, which is the best agreement obtained for an improved version of the Wilke–Chang model.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr10081528