Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials
Patent
1978-04-05
1979-01-16
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Adding material to distilland except water or steam per se
At least two materials
203 54, 203 58, 203 60, 203 62, 203 84, 2606815R, C07C 708, B01D 340
Patent
active
041347951
ABSTRACT:
Acetylenic hydrocarbons are removed from a C.sub.4 - or C.sub.5 - hydrocarbon mixture containing a C.sub.4 - or C.sub.5 - diolefin respectively. The feedstock (e.g. a C.sub.4 - or C.sub.5 - 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, dimethylacetamide 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 Isoprene is withdrawn as the distillate with substantially reduced acetylenes content. The bottoms of the second extractive distillation is split three ways. Two streams are handled conventionally (recycle and heavies removal). The third is stripped free of acetylenes so that it may be used as solvent in the second extractive distillation.
REFERENCES:
patent: 3436438 (1969-04-01), Takao et al.
patent: 3510405 (1970-05-01), Takao et al.
patent: 3851010 (1974-11-01), Rescalli et al.
patent: 3860496 (1975-01-01), Ginnasi et al.
Bascomb, Jr. Wilbur L.
Little D. B.
The Goodyear Tire & Rubber Company
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