Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.
Patent
1998-11-23
2000-12-12
Griffin, Walter D.
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By addition of extraneous agent, e.g., solvent, etc.
208208R, 208219, 208240, 208254R, C10G 1700, C10G 4500, C10G 1702, C10G 2922
Patent
active
061601934
ABSTRACT:
A method for the removal of sulfur and nitrogen containing compounds from petroleum distillates. Sulfur- and nitrogen-containing compounds are oxidized using a selective oxidant to create compounds that can be preferentially extracted from a petroleum distillate due to their increased relative polarity. Oxidation is accomplished by contacting an oxidant with a distillate under optimum conditions for that distillate and continuing the reaction until oxidized sulfur- and nitrogen-containing compounds are confirmed. Extraction is accomplished by contacting oxidized distillate with a non-miscible solvent that is selective for the relatively polar oxidized sulfur- and nitrogen-containing compounds. The oxidized compounds and solvent are separated from the distillate by gravity separation or centrifugation. The distillate is water washed and polished using clay filtration. The extraction solvent is separated from the solvent/oxidized compound mixture by a simple distillation for recycling. The high sulfur/high nitrogen fraction can be recovered using any number of treatments.
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Zannikes et al "Desulfurization of petroleum fractions by oxidation and solvent extraction" Fuel Processing technology 42, 1995 pp. 35-45.
Griffin Walter D.
Nguyen Tam M.
Renzoni George
Tavella Michael
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