Process of removing sulfur compounds from gasoline
AssigneeGTC Technology Inc.
InventorsFu-Ming Lee, Joseph C. Gentry, Randi Wright Wytcherley, Lucia Cretoiu, Calambur Shyamkumar
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Abstract
A process for the removal of sulfur compounds from a hydrocarbon stream is disclosed. In a preferred embodiment, the process includes extractive distillation of a gasoline stream from a fluid catalytic cracker to reject olefins to a raffinate stream and simultaneously extract sulfur compounds to an extract stream.
Claims19
A process to remove sulfur compounds from a gasoline stream containing olefins and sulfur compounds, comprising subjecting a gasoline stream to an extractive distillation process to concentrate the sulfur compounds in an extract stream and reject olefins to a raffinate stream, and subjecting only said extract stream to hydrodesulfurization to remove sulfur compounds, wherein said extractive distillation process comprises contacting said gasoline stream with an extractive distillation solvent which includes heavy sulfur residuals from FCC gasoline.
A process to remove sulfur compounds from a gasoline stream containing olefins and sulfur compounds comprising
- subjecting a gasoline stream to an extractive distillation process to concentrate the sulfur compounds in an extract stream and reject olefins to a raffinate stream,
- operating said extractive distillation process such that a two-liquid phase region in said extractive distillation process is minimized, and subjecting only said extract stream to hydrodesulfurization to remove sulfur compounds,
- wherein the extractive distillation is conducted with an extractive distillation solvent comprising sulfolane and a co-solvent selected from the group consisting of with 3-methylsulfolane, N-formyl morpholine, 2-pyrrolidone, dipropylsulfone, tetraethylene glycol, water, heavy sulfur residuals from FCC gasoline, or mixtures thereof as a co-solvent, and
- wherein the extraction distillation solvent is stripped, and heavy sulfur residuals remain in a lean fraction of said solvent after stripping, in an amount effective to enhance the solvent selectivity.
Dependencies are inferred from the claim text.