Acetylenes removal from diolefin streams by extractive...

Details Acetylenes removal from diolefin streams by extractive... Acetylenes removal from diolefin streams by extractive...

C - Chemistry, Metallurgy

07

C

202/76, 260/718.

C07C 11/12 (2006.01) C07C 7/08 (2006.01)

Patent

CA 1108194

Abstract of the Disclosure Acetylenic hydrocarbons are removed from a C4- or C5- hydrocarbon mixture containing a C4- or C5- diolefin respectively. The feedstock (e.g. a C4- or C5- cut from an ethylene plant) is extractively distilled to remove paraffins and mono-olefins in the raffinate, using acetonitrile (ACN), dimethyl formamide (DMF), furfural, acetone, dimethylaceta- mide or N-methyl-2-pyrrolidone mixed with 0-12 weight percent water as the extraction solvent. The bottoms from this first extractive distillation is subjected to a second extractive distillation in which virtually acetylenes-free solvent is used. Isoprene is withdrawn as the distillate with substan- tially reduced acetylenes content. The bottoms of the se- cond extractive distillation is split three ways. Two streams arc handled conventionally (recycle and heavies re- moval). The third is stripped free of acetylenes so that it may be used as solvent in the second extractive distillation.

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