Process for obtaining isobutylene of a purity higher than...

Details Process for obtaining isobutylene of a purity higher than... Process for obtaining isobutylene of a purity higher than...

C - Chemistry, Metallurgy

07

C

202/76, 260/719.

C07C 11/08 (2006.01) C07C 7/171 (2006.01)

Patent

CA 1090831

Abstract of the Disclosure 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 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 preferably a second flash distillation at a temperature which is higher than the first and is at 75°C or less, and wherein said first flash distillation is between 10 and 60° 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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