Process for obtaining isobutylene of a purity higher than 99.5 w

Details Process for obtaining isobutylene of a purity higher than 99.5 w Process for obtaining isobutylene of a purity higher than 99.5 w

1977-02-17

1979-08-07

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Convective distillation with normally gaseous medium, e.g., air

203 71, 203 73, 203 80, 203 88, 585811, 585859, B01D 114, B01D 306, C07C 704, C07C 710

Patent

active

041636970

ABSTRACT:
An improved process for recovering isobutylene contained in a mixture of hydrocarbons having four carbon atoms by selective extraction with an aqueous solution of sulfuric acid of a concentration of about 50 wt. % followed by separating the isobutylene-rich sulfuric acid extract by a first flash distillation of the extract and by a second physical separation of the isobutylene-enriched extract from said flashing step (which the latter physical separation is preferaby a second flash distillation at a temperature which is higher than the first and is at 75.degree. C. or less, and wherein said first flash distillation is between 10.degree. and 60.degree. C. and both distillations are preferably at a pressure between 0.5 and 1.5 bars absolute to give an isobutylene purity greater than 99.5%).

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patent: 3073874 (1963-01-01), Valet et al.
patent: 3150201 (1964-09-01), Edwards et al.
patent: 3272886 (1966-09-01), Edwards et al.
patent: 3544653 (1970-12-01), Webb et al.
patent: 3794690 (1974-02-01), Steggerda
Martel et al.: Chemical Engineering Progress, vol. 61, No. 3, (Mar. 1965), pp. 77-80.

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