Process for the separation of tert. butyl ethyl ether from mixtu

Details Process for the separation of tert. butyl ethyl ether from mixtu Process for the separation of tert. butyl ethyl ether from mixtu

1991-04-09

1992-10-27

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 75, 203 77, 203 78, 203 80, 203 88, 203DIG6, 568697, 568699, 568913, B01D 314, C07C 4142

Patent

active

051586525

ABSTRACT:
For the separation of tert. butyl ethyl ether from mixtures with ethanol, there are provided two distillation stages, the first being carried out at a pressure p.sub.1 equal to or higher than 1 bar, the second at a pressure p.sub.2 below p.sub.1 by a value .DELTA.p or 0.5 to 12 bars, p.sub.2 then being 0.5 to 10 bars. The second column distillate is partly supplied as reflux to the head of the second column and is in part recycled to the head of the first column. The purified TBEE is collected at the bottom of the first column and the purified ethanol at the bottom of the second column.
This separation process can be integrated into a TBEE production unit comprising etherification by ethanol of the isobutylene contained in a C.sub.4 fraction from a catalytic cracking or steam cracking stage. The ethanol separated from the TBEE is then recycled to the etherification zone.

REFERENCES:
patent: 2721222 (1955-10-01), Cottle et al.
patent: 4322565 (1982-03-01), Dotson et al.
patent: 4334890 (1982-06-01), Kochar et al.
patent: 4440963 (1984-04-01), Childs
patent: 4504687 (1985-03-01), Jones
patent: 5015783 (1991-05-01), Vora et al.

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