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In some embodiments, a monoolefin production system comprising an extraction-hydrogenation zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent and, in situ, hydrogenating the highly unsaturated hydrocarbon to a monoolefin. In other embodiments, monoolefin

In some embodiments, a monoolefin production system comprising an extraction-hydrogenation zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent and, in situ, hydrogenating the highly unsaturated hydrocarbon to a monoolefin. In other embodiments, monoolefin production systems include an extraction-hydrogenation zone for performing the extraction and hydrogenating steps in situ. In alternative embodiments, the hydrogenation zone is disposed downstream from the extraction zone.

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What is claimed is: 1. A monoolefin production system comprising: an extraction-hydrogenation zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent and, in situ, hydrogenating the highly unsaturated hydrocarbon to a monoolefin via contact with a hydrogenati

What is claimed is: 1. A monoolefin production system comprising: an extraction-hydrogenation zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent and, in situ, hydrogenating the highly unsaturated hydrocarbon to a monoolefin via contact with a hydrogenation catalyst comprising palladium, silver and optionally fluoride, wherein the polar solvent is combined with a high boiling additive to form mixture prior to contact of the mixture with the olefin stream, and wherein the high boiling additive is present with the polar solvent in the mixture during the hydrogenation. 2. The monoolefin production system of claim 1, further comprising a liquid-gas separation zone for separating the monoolefin from the polar solvent by desorption of the monoolefin, the liquid-gas separation zone being disposed downstream from the extraction-hydrogenation zone. 3. The monoolefin production system of claim 2, further comprising a recycle of the polar solvent from the liquid-gas separation zone to the extraction-hydrogenation zone. 4. The monoolefin production system of claim 3, further comprising removal of green oil from the polar solvent prior to the recycle to the extraction-hydrogenation zone. 5. The monoolefin production system of claim 1, wherein the highly unsaturated hydrocarbon comprises acetylene and the monoolefin comprises ethylene. 6. The monoolefin production system of claim 1, wherein the polar solvent comprises a compound selected from the group consisting of N-methylpyrrolidone, formamide, N-methylformamide, N-ethylformamide, N-phenylformamide, N,N-dimethylformamide, N,N-diethylformamide N,N-diphenylformamide, N-methylpyrrolidone, sulfolane, n-formyl morpholine, glycerol, triethylene glycerol, tetraethylene glycerol, and combinations thereof. 7. The monoolefin production system of claim 1, wherein the extraction-hydrogenation zone further comprises all or a portion of the polar solvent in a liquid phase and all or a portion of the olefin stream in a gas phase. 8. A monoolefin production system comprising: an extraction-hydrogenation zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent and, in situ, hydrogenating the highly unsaturated hydrocarbon to a monoolefin via contact with a hydrogenation catalyst comprising palladium. silver and optionally fluoride, wherein the polar solvent is combined with a high boiling additive to form mixture prior to contact of the mixture with the olefin stream, and wherein the high boiling additive comprises a compound selected from the group consisting of triphenylphosphine, diphenylphosphine, benzothiophene, dibenzothiophene, substituted dibenzothiophenes, pyridine, substituted pyridines, aniline, substituted anilines, alkali metal fluorides, and combinations thereof. 9. The monoolefin production system of claim 8, further comprising a liquid-gas separation zone for separating the monoolefin from the polar solvent by desorption of the monoolefin, the liquid-gas separation zone being disposed downstream from the extraction-hydrogenation zone. 10. The monoolefin production system of claim 9, further comprising a recycle of the polar solvent from the liquid-gas separation zone to the extraction-hydrogenation zone. 11. A monoolefin production system comprising: (a) an extraction zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent; and (b) a hydrogenation zone for hydrogenating the highly unsaturated hydrocarbon in the polar solvent to a monoolefin via contact with a hydrogenation catalyst comprising palladium, silver and optionally fluoride, the hydrogenation zone being disposed downstream from the extraction zone, wherein the polar solvent is combined with a high boiling additive to form mixture prior to contact of the mixture with the olefin stream, and wherein the high boiling additive is present with the polar solvent in the mixture during the hydrogenation. 12. The monoolefin production system of claim 11, further comprising a liquid-gas separation zone for separating the monoolefin from the polar solvent by desorption of the monoolefin, the liquid-gas separation zone being disposed downstream from the hydrogenation zone. 13. The monoolefin production system of claim 12, further comprising a recycle of the polar solvent from the liquid-gas separation zone to the extraction zone. 14. The monoolefin production system of claim 13, further comprising removal of green oil from the polar solvent prior to the recycle to the extraction zone. 15. The monoolefin production system of claim 11, wherein the highly unsaturated hydrocarbon comprises acetylene and the monoolefin comprises ethylene. 16. The monoolefin production system of claim 11, wherein the polar solvent comprises a compound selected from the group consisting of N-methylpyrrolidone, formamide, N-methylformamide, N-ethylformamide, N-phenylformamide, N,N-dimethylformamide, N,N-diethylformamide N,N-diphenylformamide, N-methylpyrrolidone, sulfolane, n-formyl morpholine, glycerol, triethylene glycerol, tetraethylene glycerol, and combinations thereof. 17. The monoolefin production system of claim 11, wherein the extraction zone further comprises all or a portion of the polar solvent in a liquid phase and all or a portion of the olefin stream in a gas phase. 18. A monoolefin production system comprising: (a) an extraction zone for extracting a highly unsaturated hydrocarbon from an olefin stream into a polar solvent; and (b) a hydrogenation zone for hydrogenating the highly unsaturated hydrocarbon in the polar solvent to a monoolefin via contact with a hydrogenation catalyst comprising palladium, silver and optionally fluoride, the hydrogenation zone being disposed downstream from the extraction zone, wherein the polar solvent is combined with a high boiling additive to form mixture prior to contact of the mixture with the olefin stream, and wherein the high boiling additive comprises a compound selected from the group consisting of triphenylphosphine, diphenylphosphine, benzothiophene, dibenzothiophene, substituted dibenzothiophenes, pyridine, substituted pyridines, aniline, substituted anilines, alkali metal fluorides, and combinations thereof. 19. The monoolefin production system of claim 18, further comprising a liquid-gas separation zone for separating the monoolefin from the polar solvent by desorption of the monoolefin, the liquid-gas separation zone being disposed downstream from the hydrogenation zone. 20. The monoolefin production system of claim 19, further comprising a recycle of the polar solvent from the liquid-gas separation zone to the extraction zone.