Hydrogen transfer cracking of Arabian vacuum residuum in tetralin.

(1988) Hydrogen transfer cracking of Arabian vacuum residuum in tetralin. Masters thesis, King Fahd University of Petroleum and Minerals.


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Heavy Arabian residual were hydrocracked noncatalytically using tetralin as a hydrogen donor solvent. A bolted closure packless high temperature/high pressure autoclave with a magnedrive assembly was used batchwise for this purpose. The effects of the temperature, pressure and reactants ratio on the performance of the system were studied. The products were analyzed both qualitatively and quantitatively. Methods of analysis included: hydrocarbon group analysis using an HPLC, simulated distillation using a GC, sulfur determination and API gravity, asphaltene and carbon residue determination according to ASTM standards. Most of the experiments were performed on prepared residuum boiling above 350 c. Two fractions were also employed for comparison; these are a commercial residuum boiling above 250 c, and a prepared heavy residuum boiling above 550 c. Tetralin proved to be an effective donor for Arabian residua. HPLC and simulated distillation analysis showd that heavy compounds of the residuum were converted into lighter ones. When a ratio of tetralin to residuum less than 1/1 by weight was used, coke formed in amounts proportional to tetralin. For ratios greater than 1/1, no coke formation was observed. A ratio of 2/1 was found to be a suitable ratio and was used in all runs. It was found that a minimum initial pressure of nitrogen gas was sufficient to keep the reactants in the liquid state. Otherwise pressure had no effect on the conversion. As the temperature was increased the conversion to lighter products increased. The relative percentage change of both asphaltenes and carbon residue increased with temperature. Degree of desulfurization also increased with the temperature. It was found that higher the temperature. It was fond that higher conversions were achieved with heavier residua.

Item Type: Thesis (Masters)
Subjects: Chemical Engineering
Department: College of Chemicals and Materials > Chemical Engineering
Committee Advisor: Al-Harbi, D.K.
Committee Members: Loughlin, Kevin F. and Alper, E.
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:43
Last Modified: 01 Nov 2019 13:48
URI: http://eprints.kfupm.edu.sa/id/eprint/9543