Process for purifying isoprene

Details Process for purifying isoprene Process for purifying isoprene

1977-11-21

1980-11-04

O'Keefe, Veronica

Chemistry of hydrocarbon compounds

Purification, separation, or recovery

By contact with solid sorbent

585821, 585627, C07C 704, C07C 712, C07C 1118

Patent

active

042321824

ABSTRACT:
A process for purifying isoprene produced by catalytic decomposition of dimethyldioxane from carbonyl compounds and cyclopentadiene which involves passing isoprene at a temperature of 40.degree. to 70.degree. C. through a bed of a solid product such as an anion exchange resin or alkali (the latter may be used with or without an inert carrier), followed by subjecting the isoprene to close fractionation performed with at least 50 theoretical plates and at a reflux ratio of at least 3. The process of the present invention enables practically complete purification of isoprene from carbonyl compounds and cyclopentadiene. The purified isoprene, when used as a monomer in the production of stereospecific isoprene rubber, results in high-quality products; and reduces by a factor of 2-3 the Ziegler catalyst consumption in the isoprene rubber synthesis.

REFERENCES:
patent: 3409691 (1968-01-01), Small
patent: 3560586 (1971-02-01), Kronig et al.
patent: 3804911 (1974-04-01), Liakumovich et al.
patent: 3832416 (1974-08-01), Van Grinsveu
patent: 3972955 (1976-08-01), Halcour et al.

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