Method of separating ethyl tertiobutyl ether from mixtures with

Details Method of separating ethyl tertiobutyl ether from mixtures with Method of separating ethyl tertiobutyl ether from mixtures with

1992-03-09

1993-10-05

Bascomb, Jr., Wilbur

Distillation: processes, separatory

With disparate physical separation

203 73, 203 74, 203 75, 203 76, 203 77, 203 92, 203DIG6, 568697, 568699, 568913, B01D 334, C07C 4142

Patent

active

052501566

ABSTRACT:
The separation of ethyl tertiobutyl ether from mixtures with ethanol is based on heteroazeotropic distillation with water as the entrainer using two distillation columns, coupled with an overhead decanter. Purified ethanol is collected from the bottom of the first column and purified ETBE from the bottom of the second column. The separation method may be incorporated into an ETBE production unit in which isobutene (contained in a C.sub.4 -cut from steam cracking, catalytic cracking, or dehydrogenation of isobutane) is etherified by ethanol. Ethanol separated from the ETBE is then recycled to the etherification zone.

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