Ethyl tertio-butyl ether purification process combining a membra

Details Ethyl tertio-butyl ether purification process combining a membra Ethyl tertio-butyl ether purification process combining a membra

1995-03-28

1997-03-04

Manoharan, Virginia

Distillation: processes, separatory

With disparate physical separation

203 94, 203 98, 203 99, 203DIG9, 203DIG19, 203DIG16, 21050027, 21050035, 210640, 210649, 568697, 568699, 568913, B01D 300, C07C 4142

Patent

active

056075570

ABSTRACT:
A process for separating a mixture containing mainly ethyl tertio-butyl ether (ETBE), ethanol and C.sub.4 hydrocarbons includes introducing the mixture to be separated into a debutanizer from which the C.sub.4 hydrocarbons are recovered overhead with a fraction of the ethanol, and purified ETBE is recovered as a bottom product; a side stream of an ethanol-rich phase is extracted and sent to a permeation zone in which the dense film of the membrane is constituted by a N,N-dimethylaminoethyl methacrylate polymer (DMAEMA) or a copolymer of DMAEMA with N-vinylcaprolactam (NVCL) and/or with N-vinyl pyrrolidone (NVP); the ethanol-depleted retentate from this permeation zone is returned to the debutanizer and the permeate contains mainly separated ethanol.
The process can be integrated into an ETBE production process, in which the ethanol separated during the permeation step is recycled to the etherification reactor. The debutanizer may be replaced by a catalytic distillation column.

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