Measurements of Binary Molecular Diffusion and Dispersion Coefficients of Urea and Ethyl Acetate
Date
2022-05-27
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The environmental impact of in-situ thermal bitumen recovery methods from oil sands has motivated the search for new solvents/chemicals to reduce energy intensity and greenhouse gas emissions. Recently, new solvents/chemicals have been examined on the laboratory and field-scale for co-injection with steam or hot water. However, the fate of the proposed chemicals/solvents in the subsurface has not been studied. Diffusion and dispersion coefficients of the injected chemicals are two important transport properties required to predict the fate of the injected solvents in the subsurface. Ethyl acetate and urea are among the chemicals that have been suggested to improve bitumen recovery from oil sands. However, there is a lack of accurate measurements of the diffusion and dispersion coefficients of these chemicals. To fill this gap, the longitudinal dispersion coefficients of binary liquid mixtures of ethyl acetate and urea were measured using the Taylor dispersion technique at various concentrations of solute and several flow rates by performing a series of displacement experiments through the sand-packed bed. New measurements of the concentration-dependent longitudinal dispersion coefficients in porous media of aqueous urea solution and ethyl acetate-water mixture are reported. In addition, experimental data for the binary diffusion coefficients of ethyl acetate-water systems over the entire range of compositions at temperatures from 298.15 K to 368.15 K are reported.
Description
Keywords
Dispersion coefficient, Molecular diffusion coefficient, Taylor dispersion method
Citation
Kheirollahi, S. (2022). Measurements of Binary Molecular Diffusion and Dispersion Coefficients of Urea and Ethyl Acetate (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.