A process for recovering 1,3-butadiene from a C 4 fraction, comprising: feeding a hydrocarbon fraction containing butanes, butenes, 1,2-butadiene, 1,3-butadiene, C 4 acetylenes, C 3 acetylenes, and C 5+ hydrocarbons to an extractive distillation system; contacting the hydrocarbon fraction with a solvent in the extractive distillation system to selectively dissolve a portion of the hydrocarbon fraction; recovering a vapor fraction comprising a first portion of the butanes and the butenes from the extractive distillation system; recovering an enriched solvent fraction comprising the 1,3-butadiene, the 1,2-butadiene, C 4 acetylenes, C 3 acetylenes, C 5+ hydrocarbons, and a second portion of the butanes and the butenes; feeding the enriched solvent fraction to a rectifier to at least partially degas the enriched solvent; recovering a second portion of the butanes and butenes from the rectifier as an overheads fraction; recovering the C 3 and C 4 acetylenes, 1,3-butadiene, 1,2-butadiene, and C 5+ hydrocarbons from the rectifier as a side draw fraction; recovering a partially degassed solvent comprising 1,2-butadiene and C 4 acetylenes from the rectifier as a bottoms fraction; feeding at least a portion of the partially degassed solvent to a degasser to further degas the solvent; recovering an overheads fraction comprising at least one of C 4 acetylenes and 1,2-butadiene from the degasser; recovering a side draw fraction comprising the C 4 acetylenes from the degasser; recovering a bottoms fraction comprising degassed solvent from the degasser; compressing the degasser overheads fraction using a liquid ring compressor; and recycling at least a portion of the compressed degasser overheads fraction to the rectifier. feeding a hydrocarbon fraction containing butanes, butenes, 1,2-butadiene, 1,3-butadiene, C 4 acetylenes, C 3 acetylenes, and C 5+ hydrocarbons to an extractive distillation system; contacting the hydrocarbon fraction with a solvent in the extractive distillation system to selectively dissolve a portion of the hydrocarbon fraction; recovering a vapor fraction comprising a first portion of the butanes and the butenes from the extractive distillation system; recovering an enriched solvent fraction comprising the 1,3-butadiene, the 1,2-butadiene, C 4 acetylenes, C 3 acetylenes, C 5+ hydrocarbons, and a second portion of the butanes and the butenes; feeding the enriched solvent fraction to a rectifier to at least partially degas the enriched solvent; recovering a second portion of the butanes and butenes from the rectifier as an overheads fraction; recovering the C 3 and C 4 acetylenes, 1,3-butadiene, 1,2-butadiene, and C 5+ hydrocarbons from the rectifier as a side draw fraction; recovering a partially degassed solvent comprising 1,2-butadiene and C 4 acetylenes from the rectifier as a bottoms fraction; feeding at least a portion of the partially degassed solvent to a degasser to further degas the solvent; recovering an overheads fraction comprising at least one of C 4 acetylenes and 1,2-butadiene from the degasser; recovering a side draw fraction comprising the C 4 acetylenes from the degasser; recovering a bottoms fraction comprising degassed solvent from the degasser; compressing the degasser overheads fraction using a liquid ring compressor; and recycling at least a portion of the compressed degasser overheads fraction to the rectifier.