Process for separating highly pure butene-1 and butene-2

Details Process for separating highly pure butene-1 and butene-2 Process for separating highly pure butene-1 and butene-2

C - Chemistry, Metallurgy

07

C

202/76

C07C 7/08 (2006.01) C07C 7/00 (2006.01) C07C 11/167 (2006.01)

Patent

CA 1190176

ABSTRACT A process for separating highly pure butene-2 and butene-1 from a C4 hydrocarbon fraction containing isobutane, n-butane, butene-1, butene-2, and at least one diolefinic hydrocarbon and/or at least one acetylenic hydrocarbon, which comprises,(1) as a step A, treating the C4 hydrocarbon fraction with a polar solvent to separate it into a raffinate containing isobutane and n-butane and an extract containing butene-1, butene-2, the diolefinic hydrocarbon and/or the acetylenic hydrocarbon, (2) as a step B, introducing the extract from step A into a first distillation column to obtain a fraction containing butene-1, the olefinic hydro- carbon and/or the acetylenic hydrocarbon and purified butene- 2, (3) as a step C, introducing the fraction obtained in step B into a second extractive distillation column and treating it with a polar solvent to separate it into a raffinate containing butene-1 and an extract containing the diolefinic hydrocarbon and/or the acetylenic hydrocarbon, or (2') as a step B, introducing the extract from step A into a second extractive distillation column and treating it with a polar solvent to separate it into a raffinate containing butene-1 and butene-2 and an extract containing the diolefinic hydrocarbon and/or the acetylenic hydrocarbon, (3') as a step C, introducing the raffinate from the step B into a first distillation column to obtain butene-1 and purified butene-2, and (4) as a step D, introducing the raffinate or butene-1 obtained in step C into a second distillation column to remove a tiny amount of water and obtain purified butene-1.

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