Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

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During this time period, we performed experiments to examine the effects of solvent composition on the diffusion controlled uptake of quinoline into alumina catalyst pellets. Of particular interest was the effect of solvent aromaticity on the diffusive uptake process. The uptake experiments were performed at a temperature of 300 C for the adsorptive diffusion of quinoline in a solvent mixture of mineral oil and 1-methyl naphthalene onto alumina catalyst pellets. These experiments were conducted in a 40 cm{sup 3} microautoclave, the use of which is more economical from both a purchasing and waste disposal standpoint due to the small quantities … continued below

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53 pages

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Guin, James A. & Vadlamani, Surya April 1, 1999.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 37 times. More information about this report can be viewed below.

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  • Auburn University
    Publisher Info: Auburn University (United States)
    Place of Publication: Auburn, Alabama

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During this time period, we performed experiments to examine the effects of solvent composition on the diffusion controlled uptake of quinoline into alumina catalyst pellets. Of particular interest was the effect of solvent aromaticity on the diffusive uptake process. The uptake experiments were performed at a temperature of 300 C for the adsorptive diffusion of quinoline in a solvent mixture of mineral oil and 1-methyl naphthalene onto alumina catalyst pellets. These experiments were conducted in a 40 cm{sup 3} microautoclave, the use of which is more economical from both a purchasing and waste disposal standpoint due to the small quantities of solvents and catalysts utilized, and is also significantly safer at the higher temperatures. In order to study the effect of aromaticity of the solvent on the hindered diffusion-adsorption process, the experiments were performed at different volume fractions of 1-methyl naphthalene. Detailed calculations were made to estimate the effects of aromaticity, i. e., as reflected by the percentage of 1-methyl naphthalene in the solvent, on the diffusive properties of the solute. Model simulation results were then performed which showed that the mathematical model incorporating diffusion and adsorption mechanisms satisfactorily fitted the adsorptive diffusion of quinoline onto the alumina catalyst at 300 C with various solvent aromaticities. The logarithm of the adsorption constant at a particular volume fraction of 1-methyl naphthalene, obtained by simulating the experimental data with the model solution, was found to be linearly dependent on an aromaticity factor.

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53 pages

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OSTI as DE00816518

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  • Other Information: PBD: 1 Apr 1999

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  • April 1, 1999

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  • Oct. 18, 2015, 6:40 p.m.

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  • Jan. 23, 2021, 3:04 p.m.

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Guin, James A. & Vadlamani, Surya. Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report, report, April 1, 1999; Auburn, Alabama. (https://digital.library.unt.edu/ark:/67531/metadc737301/: accessed May 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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