Separations with ionic liquid solvents
AssigneesChevron Phillips Chemical Company LP, Chevron U.S.A. Inc.
InventorsLei Ji, Ai-Fu Chang, Michael S. Driver, Hye Kyung Timken
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Abstract
Disclosed are systems and methods which provide a process stream comprising a gaseous component, capture the gaseous component from the process stream by an ionic liquid solvent of a separator, and recover a captured gaseous component from the ionic liquid solvent in a regenerator. A second gaseous component from the process stream may be captured by the ionic liquid solvent of the separator, and the second gaseous component may be recovered from the ionic liquid solvent in the regenerator. Alternatively, the second gaseous component from the process stream may be uncaptured by the ionic liquid solvent, and the uncaptured second gaseous component may be recovered from a membrane unit.
Claims44
A method comprising:
- providing a process stream comprising an olefin;
- capturing at least a portion of the olefin from the process stream by an ionic liquid solvent, wherein the capturing is performed at a liquid-to-gas mass flow ratio from about 1 to about 350;
- and
- recovering at least a portion of a captured olefin from the ionic liquid solvent.
A method comprising:
- providing a process stream comprising an olefin, wherein the process stream further comprises an alkane;
- capturing at least a portion of the olefin from the process stream by an ionic liquid solvent, wherein the capturing is performed at a liquid-to-gas mass flow ratio such that at least a portion of the alkane is captured by the ionic liquid solvent in addition to the capture of at least a portion of the olefin;
- and
- recovering at least a portion of a captured olefin from the ionic liquid solvent,
- wherein the liquid-to-gas mass flow ratio is greater than about 15.
A method comprising:
- providing a process stream comprising an olefin, wherein the process stream further comprises an alkane;
- capturing at least a portion of the olefin from the process stream by an ionic liquid solvent, wherein the capturing is performed at a liquid-to-gas mass flow ratio such that at least a portion of the alkane from the process stream is not captured by the ionic liquid solvent;
- and
- recovering at least a portion of a captured olefin from the ionic liquid solvent,
- wherein the liquid-to-gas mass flow ratio is less than about 200.
A method comprising:
- providing a process stream comprising an olefin;
- capturing at least a portion of the olefin from the process stream by an ionic liquid solvent;
- flowing the ionic liquid solvent at a mass flow rate from about 1,000 pounds per hour to about 300,000 pounds per hour;
- and
- recovering at least a portion of a captured olefin from the ionic liquid solvent.
Dependencies are inferred from the claim text.