Removal of sulfur-containing compounds from liquid...

Details Removal of sulfur-containing compounds from liquid... Removal of sulfur-containing compounds from liquid...

C - Chemistry, Metallurgy

10

G

C10G 27/12 (2006.01) C10G 53/14 (2006.01)

Patent

CA 2477565

A process effective for the removal of organic sulfur compounds from liquid hydrocarbons is disclosed. The process more specifically addresses the removal of thiophenes and thiophene derivatives from a number of petroleum fractions, including gasoline, diesel fuel, and kerosene. In the first step of the process, the liquid hydrocarbon is subjected to oxidation conditions in order to oxidize at least some of the thiophene compounds to sulfones. Then, these sulfones can be catalytically decomposed to hydrocarbons (e.g. hydroxybiphenyl) and volatile sulfur compounds (e.g. sulfur dioxide). The hydrocarbon decomposition products remain in the treated liquid as valuable blending components, while the volatile sulfur compounds are easily separable from the treated liquid using well-known techniques such as flash vaporization or distillation.

L'invention porte sur un procédé efficace permettant d'extraire des composés de soufre organiques d'hydrocarbures liquides. Ce procédé porte plus particulièrement sur l'extraction de thiophène et de dérivés de thiophène d'un certain nombre de fractions de pétrole, y compris de l'essence, du diesel, et du kérosène. Au cours de la première étape du procédé, l'hydrocarbure liquide est soumis à des conditions d'oxydation afin d'oxyder au moins certains des composés de thiophène en sulfones. Puis, ces sulfones peuvent être décomposés par catalyse en hydrocarbures (par exemple de l'hydroxybiphényle) et en composés de soufre volatiles (par exemple du dioxyde de soufre). Ces produits de décomposition d'hydrocarbure demeurent dans le liquide traité en tant que composés de mélange utiles, alors que les composés de soufre volatiles peuvent être facilement séparés du liquide traité au moyen des techniques connues telles que la vaporisation ou la distillation instantanée.

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