Patent ID: 9062262
Filing Date: 2015-06-23
Classification: C07C,C10G

Abstract:
1. A method of separating 1,3-butadiene from a crude C 4 stream, comprising: (a) supplying the crude C (b) selectively hydrogenating acetylenes in the crude C (b-1) introducing the hydrogenated C (c) supplying a C (d) introducing a bottom stream of the extractive distillation column into a pre-separator, and then supplying a top gas stream of the pre-separator into a solvent recovery column and supplying a bottom liquid stream of the pre-separator into a solvent stripping column; (e) supplying a top stream of the solvent stripping column, containing part of the extraction solvent, butadiene, and acetylenes, into the solvent recovery column along with the top stream of the pre-separator; and (f) introducing a top stream of the solvent recovery column, from which the extraction solvent is removed, into a purification column to obtain 1,3-butadiene, wherein (i) a part of the top stream of the extractive distillation column is recirculated to the first hydrogenation reactor, (ii) both a part of the hydrogenated C wherein the method is carried out using only a single extractive distillation column.