Process for the recovery of isoprene, and isoprene so recovered

Details Process for the recovery of isoprene, and isoprene so recovered Process for the recovery of isoprene, and isoprene so recovered

C - Chemistry, Metallurgy

07

C

202/78, 260/718.

C07C 11/18 (2006.01) C07C 7/00 (2006.01) C07C 7/10 (2006.01)

Patent

CA 1146978

A B S T R A C T Recovering isoprene from a C5 hydrocarbon fraction by (i) distillation (D1) to remove hydrocarbons boiling below isoprene; (ii) a liquid-liquid extraction stage (E1) using a sulfolane to form a first raffinate phase rich in normal- pentane and pentenes and s sulfolane extract phase to liquid- isoprene, subjecting the sulfolane extract phase to liquid- liquid extraction (E2) using a counter-solvent, which is a C6 or higher alkane, as the extractant to form a second raffinate phase comprising mainly the sulfolane and a counter- solvent extract phase rich in isoprene and distilling (D2) the counter-solvent extract phase to remove the counter-solvent therefrom; (iii) distillation (D3) to remove hydrocarbons boiling above isoprene, provided stage (iii) does not precede stage (ii).

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