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US 9,783,747 B2Granted
Process for desulfurization of naphtha using ionic liquids
AssigneeUop LLC
InventorsRajeswar R. Gattupalli, Soumendra M. Banerjee, Christopher P. Nicholas, Alakananda Bhatacharyya
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Abstract
A process has been developed in which some of the sulfur in a naphtha feed is removed using ionic liquids. The ionic liquid desulfurization step, which operates at low temperatures and pressures, is followed by a catalytic hydrodesulfurizaton step.
Claims18
A method for desulfurization of naphtha comprising:
- introducing a thermally or catalytically cracked naphtha stream containing sulfur compounds and a naphtha-immiscible ionic liquid into an ionic liquid desulfurization zone to remove a first portion of the sulfur compounds to provide an effluent comprising naphtha having reduced sulfur and a naphtha-immiscible ionic liquid containing the sulfur compounds;
- and
- introducing the effluent comprising naphtha having reduced sulfur from the ionic liquid desulfurization zone and hydrogen into a catalytic hydrodesulfurization zone to remove a second portion of the sulfur compounds.
A method for desulfurization of naphtha comprising:
- introducing a thermally or catalytically cracked naphtha stream containing sulfur compounds and a naphtha-immiscible ionic liquid into an ionic liquid desulfurization zone to remove a first portion of the sulfur compounds to provide an effluent comprising naphtha having reduced sulfur and a naphtha-immiscible ionic liquid containing the sulfur compounds;
- introducing the effluent comprising naphtha having reduced sulfur from the ionic liquid desulfurization zone and hydrogen into a catalytic hydrodesulfurization zone to remove a second portion of the sulfur compounds;
- separating an effluent from the catalytic hydrodesulfurization zone into a low sulfur liquid component and a sulfur containing gas component;
- and
- regenerating the naphtha-immiscible ionic liquid containing the sulfur compounds by steam stripping to produce the extract stream comprising the sulfur compounds and the regenerated naphtha-immiscible ionic liquid stream.
2 more elements
Dependencies are inferred from the claim text.