Integrated systems and methods for producing 1,3-butadiene via extractive distillation, distillation, and/or selective hydrogenation

A method of producing 1,3 butadiene, the method comprising:

• extractive distilling of a C4 hydrocarbon feed to form a crude butadiene stream comprising 1,3 butadiene and one or more C4 acetylenes;
• distilling, by one or more distillation columns, the crude butadiene stream to recover butadiene, acetylene and raffinate;
• withdrawing, from the one or more distillation columns, a side stream comprising primarily the one or more C4 acetylenes;
• and
• hydrogenating at least some of the C4 acetylene of the side stream to produce 1,3 butadiene in a product stream,
• wherein the C4 hydrocarbon feed comprises one or more butanes, 1,2-butadiene, 1,3-butadiene, vinyl acetylene, and ethyl acetylene and C5+ hydrocarbons;
• and
• wherein the C4 hydrocarbon feed stream comprises 0.1 to 10 wt. % butane, 5 to 35 wt. % isobutene, 5 to 35 wt. % 1-butene, 1 to 15 wt. % 2-butenes, 0.01 to 5 wt. % methyl acetylene, 0.01 to 5 wt. % 1,2 butadiene, 25 to 60 wt. % 1,3 butadiene, 0.1 to 10 wt. % vinyl acetylene, and 0.1 to 10 wt. % ethyl acetylene.