Isobutylene-assisted aqueous extraction of methanol from...

Details Isobutylene-assisted aqueous extraction of methanol from... Isobutylene-assisted aqueous extraction of methanol from...

C - Chemistry, Metallurgy

07

C

C07C 43/04 (2006.01) C07C 41/01 (2006.01) C07C 41/09 (2006.01) C07C 41/38 (2006.01) C07C 41/42 (2006.01)

Patent

CA 2135141

ISOBUTYLENE-ASSISTED AQUEOUS EXTRACTION OF METHANOL FROM METHYL TERTIARY BUTYL ETHER (Docket No. 81,148-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 an isobutyl- ene fraction in an extraction zone comprising a counter- current contact tower to provide an overhead raffinate comprising isobutylene, methyl tertiary butyl ether and a minor amount of water and an extract 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 distilla- tion 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 returned to the contact tower as the isobutylene fraction.

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