Method for the water washing and recovery of methyl tertiary...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 43/04 (2006.01) C07C 41/06 (2006.01) C07C 41/38 (2006.01) C07C 41/42 (2006.01) C07C 41/44 (2006.01)

Patent

CA 2172581

An improved method of recovering methyl tertiary butyl ether from an etherification reaction product containing acidic by-products wherein the reaction product is charged to an MTBE distillation zone and fractionated therein to provide a lower boiling distillation fraction comprising isobutylene, methyl tertiary butyl ether, methanol and acidic by-products, wherein the lower boiling distillation fraction is counter- currently washed with alkaline water in a methanol extraction tower, and wherein an aqueous solution of an alkali is injected into the tower below the charge point for the wash water to substantially completely neutralize the acidic by- products and to provide an overhead extract substantially free from acidic by-products comprising isobutylene, methyl tertiary butyl ether and a minor amount of water, and a bottoms raffinate comprising methanol, water, alkaline by- products and a minor amount of methyl tertiary butyl ether.

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