Removal of methanol from methyl tertiary butyl ether

Details Removal of methanol from methyl tertiary butyl ether Removal of methanol from methyl tertiary butyl ether

C - Chemistry, Metallurgy

07

C

C07C 43/04 (2006.01) C07C 41/06 (2006.01) C07C 41/09 (2006.01) C07C 41/38 (2006.01)

Patent

CA 2181980

MTBE, prepared by reacting MeOH with TBA to form a primary etherification reaction product, is distilled in a first distillation column to provide a first lower boiling distillation fraction comprising methyl tertiary butyl ether, isobutylene, methanol, dimethyl ether, and the first lower boiling fraction is water washed to provide an overhead extract that is distilled in a second distillation column to provide a second lower boiling distillation fraction compris- ing isobutylene, dimethyl ether and water, which is dewatered to provide a feed fraction comprising isobutylene and dimethyl ether that is reacted with less than an equivalent amount of MeOH to provide a secondary reaction product comprising MTBE, less than 0.5 wt.% of MeOH, isobutylene and contaminants including TBA and dimethyl ether, and the secondary reaction product is recycled to the second distillation column.

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