Process for distillation and purification of a crude alcohol...

Details Process for distillation and purification of a crude alcohol... Process for distillation and purification of a crude alcohol...

B - Operations, Transporting

01

D

202/73

B01D 3/40 (2006.01) C07C 29/80 (2006.01) C07C 29/82 (2006.01) C07C 29/84 (2006.01)

Patent

CA 1055875

ABSTRACT A crude alcohol-containing mixture comprising a sat- urated aliphatic alcohol of not more than 3 carbon atoms and associated impurities is processed to permit recovery of the desired alcohol product in highly concentrated and purified form. In a first extractive distillation tower the crude feed is subjected to extractive distillation with water to remove substantially all the impurities overhead. An aqueous bottoms stream from the first tower containing 5 to 10 wt. % alcohol and only minor amounts of impurities is fed to a second recti- fying tower where the alcohol product is concentrated and re- covered. Stripped aqueous effluent is withdrawn from the bot- tom of the rectifying tower and is recycled in part to the first tower. An aqueous alkali solution is introduced into the rectifying tower and regulated 80 that the concentration of alkali in the stripped aqueous effluent from the bottom of the tower is from about 0.10 to about 0.24 gram per liter. Overhead and intermediate purge streams containing low boiling and high boiling impurities may be removed from the rectifying tower and fed to a third tower along with the overhead from the first tower. The impurities are recovered as by-products from the third tower, and an alcohol stream is recycled from the third tower to the first tower.

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