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in creator/contributor: "Guin, James A."

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Hindered Diffusion of Asphaltenes at Evaluated Temperature and Pressure

During this time period, uptake experiments were performed at elevated temperatures up to 280 o C for the adsorptive diffusion of a coal asphaltene in 1- methylnaphthalene onto alumina catalyst pellets. Model simulation results showed that a mathematical model incorporating diffusion and adsorption mechanisms satisfactorily fitted the adsorptive diffusion of coal asphaltenes onto the alumina catalyst in a fairly wide temperature range of 55 o C to 280 o C. The logarithm of the adsorption consta… more

Date: December 4, 1998

Creator: Guin, James A.; Vadlamani, Surya & Yang, Xiafeng

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

During this time period, experiments were performed to study the diffusion controlled uptake of quinoline and a coal asphaltene into porous carbon catalyst pellets. Cyclohexane and toluene were used as solvents for quinoline and the coal asphaltene respectively. The experiments were performed at 27 C and 75 C, at a pressure of 250 psi (inert gas) for the quinoline/cyclohexane system. For the coal asphaltene/toluene system, experiments were performed at 27 C, also at a pressure of 250 psi. These… more

Date: October 7, 1999

Creator: Guin, James A. & Ramakrishnan, Ganesh

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

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… more

Date: April 1999

Creator: Guin, James A. & Vadlamani, Surya

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

During this final time period of the project, work was carried out in two areas. A major amount of effort was devoted to preparation of the final technical report for the project. The data taken on the project were organized and the asphaltenes, solvents, and catalysts used in the diffusional uptake experiments were organized into various systems. Since a large portion of the time for this report was spent on the preparation of the final technical report itself, the executive summary of the fin… more

Date: October 2001

Creator: Guin, James A. & Emerson, Zachery

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

The mathematical model which we have developed previously for diffusion controlled adsorption was extended to allow for the inclusion of the effects of extraparticle film mass transfer resistance as embodied in a finite Sherwood number. A Mathcad based program was used to simulate the experimental data using summation of a large number of terms in the infinite series solution. Parametric studies and accompanying plots revealed that the effects of film resistance on the uptake process were found… more

Date: April 2001

Creator: Guin, James A.; Ramakrishnan, Ganesh; Asada, Keiji & Mosley, Brian

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

During this past six months we continued our ongoing studies of the diffusion controlled uptake of coal and petroleum asphaltenes into a porous carbon catalyst. Toluene was used as the solvent for experiments at 20 C and 75 C while 1-methylnaphthalene was the solvent for the higher temperature experiments at 100 C, 150 C and 250 C. All runs were made at a pressure of 250 psi (inert He gas). Experiments were performed at 20 C and 75 C, for the petroleum asphaltene/toluene system. For the coal as… more

Date: April 7, 2000

Creator: Guin, James A.; Ramakrishnan, Ganesh & Asada, Keiji

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Hindered Diffusion of Asphaltenes at Elevated Temperature and Pressure Progress Report

During this time period work proceeded in two main areas, the performance and analysis of petroleum asphaltene diffusional uptake experiments at 325 C and the preparation and testing of some new carbon based catalysts. In the first area, we performed studies of the diffusion controlled uptake of petroleum asphaltenes into a porous carbon catalyst at 325 C. The experiments were performed under an inert He atmosphere using 1-methylnaphthalene as a solvent. These purpose of these experiments was t… more

Date: September 29, 2000

Creator: Guin, James A.; Ramakrishnan, Ganesh; Asada, Keiji & Mosley, Brian

Item Type: Report

Partner: UNT Libraries Government Documents Department