Continuous isobutylene-assisted aqueous extraction of...

Details Continuous isobutylene-assisted aqueous extraction of... Continuous isobutylene-assisted aqueous extraction of...

C - Chemistry, Metallurgy

07

C

C07C 43/04 (2006.01) C07C 41/38 (2006.01) C07C 41/42 (2006.01)

Patent

CA 2135140

CONTINUOUS EXTRACTION OF METHYL TERTIARY BUTYL ETHER WITH WATER AND ISOBUTYLENE (Docket No. 81,181 -F) ABSTRACT OF THE DISCLOSURE An impure methyl tertiary butyl ether product contami- nated with isobutylene, methanol and water is purified by continuous counter-current contact with water and isobutylene in a counter-current contact extraction tower to provide an overhead extract comprising isobutylene, methyl tertiary butyl ether and water and a raffinate comprising methanol, water and a minor amount of methyl tertiary butyl ether, the overhead raffinate being separated in a methyl tertiary butyl ether purification distillation zone into a lighter distillation fraction comprising isobutylene and water and a heavier distillation fraction consisting essentially of methyl tertiary butyl ether, the lighter distillation fraction being decanted to remove water and to provide a distillate isobutyl- ene fraction that is charged to a surge drum from which isobutylene is returned to the contact tower.

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