Combined distillation and permeation process for the separation

Details Combined distillation and permeation process for the separation Combined distillation and permeation process for the separation

1994-11-07

1997-03-11

McMahon, Timothy

Distillation: processes, separatory

With disparate physical separation

203 98, 210634, 210649, B01D 336

Patent

active

056097344

ABSTRACT:
A process for the separation of oxygenated compounds, containing mainly methanol and possibly a minor amount of water and/or dimethyl ether, from a mixture of hydrocarbons containing 3 to 8 carbon atoms containing said oxygenated compounds. The mixture is distilled in a distillation zone (D). A gaseous distillate (line 2) is taken overhead which contains methanol, possibly water, possibly dimethyl ether, and hydrocarbons. The gaseous distillate is separated in a separator (B) and at least one organic liquid phase is recovered (line 6) and sent as a reflux to the head of distillation zone D. An aqueous liquid phase (line 5) may possibly be recovered, also a gaseous phase (line 4). A phase (line 8) is extracted as a side stream from the distillation zone and sent to a permeation zone (PV) comprising at least one membrane which is selectively permeable to methanol; a permeation step is carried out on said phase. At least one methanol-enriched permeate (line 14) is recovered downstream of the permeation zone, preferably as a vapor, and at least one residue (line 11) is recovered upstream which is optionally recycled to the distillation zone. The purified hydrocarbon mixture is extracted (line 16) from the bottom of the distillation column.

REFERENCES:
patent: 4740632 (1988-04-01), Anderson et al.
patent: 4759850 (1988-07-01), Farnand et al.
patent: 4774365 (1988-09-01), Chen et al.
patent: 5152898 (1992-10-01), Bartels
patent: 5292963 (1994-03-01), Kanji et al.

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