06461859 is referenced by 7 patents.

The invention relates to a method of removing thiophenic and organosulfide compounds from a fossil fuel comprising the steps of contacting the fossil fuel with hemoproteins, which oxidize the sulfur containing compounds to sulfoxides and sulfones in a reaction system containing organic solvent or not, and followed by a distillation step in which sulfoxides and sulfones are removed from the fuel. Preferred biocatalysts include hemoproteins such as chloroperoxidase from

Caldariomyces fumago,

and peroxidases and cytochromes from animal, plant or microbial cells. The hemoprotein biocatalyst can be contacted with the fossil fuel in free or immobilized forms. The reaction can be carried out in the presence of the fuel alone or with addition of any organic solvent. The biocatalytically oxidized fuel is then distilled in order to eliminate the heavy fraction which contains most of oxidized organosulfur compounds. The light distillate contains significantly lower concentrations of sulfur when compared with the starting fossil fuel.

Title
Enzymatic oxidation process for desulfurization of fossil fuels
Application Number
9/392612
Publication Number
6461859 (B1)
Application Date
September 9, 1999
Publication Date
October 8, 2002
Inventor
Raunel Tinoco
Cuernavaca
US
Eduardo Barzana
Delego
US
Maria del Pilar Bremauntz
Edo. de México
US
Rafael Vazquez Duhalt
Cuernavaca
US
Agent
Roylance Abrams Berdo & Goodman L
US
Assignee
Universidad Nacional Autonoma de Mexico
US
Instituto Mexicano del Petroleo
US
IPC
C10G 32/00
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