Patent ID: 9328295
Filing Date: 2016-05-03
CPC Classification: B01D,C10G

Claim Text:
1. A method of regenerating a rich ionic liquid stream, the rich ionic liquid stream containing a contaminant, the method comprising: contacting the rich ionic liquid stream with a recycle extract stream containing the contaminant in a contaminant extraction zone to transfer at least a portion of the contaminant in the recycle extract stream to the rich ionic liquid stream, wherein the ionic liquid is immiscible in a hydrocarbon; separating an effluent from the contaminant extraction zone into a lean ionic liquid stream and an extract stream containing the contaminant, wherein at least a portion of the extract stream containing the contaminant comprises the recycle extract stream; adding a solvent to the contaminant extraction zone, wherein the solvent is miscible in the ionic liquid and immiscible in the hydrocarbon, and wherein the effluent from the contaminant extraction zone further comprises the solvent; wherein the lean ionic liquid stream further comprises the solvent; and removing the solvent from the lean ionic liquid stream.