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Hydrous alcohol distillation method and apparatus
| Details |
Inventors: Brush, Burke F.; Katzen, Raphael;
Assignee: Raphael Katzen Associates International, Inc. (Cincinnati, OH)
Primary Examiner: Bascomb, Jr.; Wilbur L.
Assistant Examiner:
Attorney, Agent or Firm: Merriam, Marshall & Bicknell
An improved distillation method and apparatus are provided for recovering hydrous ethanol from fermentation or synthetic feedstocks. Substantial energy savings are realized by utilizing a pair of stripper-rectifier towers in which overhead vapors from one tower operating at a higher pressure supply the heat required for the other tower operating at a lower pressure and by preheating the feedstock in multiple heat exchange steps. The feedstock is split into two portions of unequal size, the larger portion being supplied to the higher pressure tower and the smaller portion to the lower pressure tower. |
|
DETAILED DESCRIPTION Although any suitable fermented or synthetic feedstock can be used in practicing the invention, the distillation system illustrated in the drawing utilizes a fermented beer feedstock obtained by fermentation of a fermentable sugar material.
The feedstock will usually contain from about 0.
5 to about 20 wt.
% ethanol, up to about 1.
0 wt.
% organic impurities, and up to about 10 wt.
% dissolved and suspended solids.
The system utilizes a pair of stripper-rectifier towers 10 and 11, the tower 10 being operated at a higher pressure than the tower 11.
The fermented beer at a temperature of from about 80.
degree.
F.
to about 100.
degree.
F.
is introduced through line 12 and pump 13 and is partially preheated in successive stages by passing through line 14 and product cooler 16, line 17 and condenser 18, and line 19 and heat exchanger or cooler 21, as described in more detail below.
The partially preheated feedstock leaving the heat exchanger 21 through line 22 is then split into two streams of unequal size.
The first feed stream passes through line 23 to a heat exchanger 24 where the final preheat is provided.
This feed stream is the smaller of the two and preferably comprises less than 50 wt.
% but not less than about 30 wt.
% of the total feed.
The preheated feed stream then passes through line 26 to a degassing drum 27 where dissolved carbon dioxide resulting as a by-product of the fermentation is removed.
In the case of synthetic feedstock from direct hydration synthesis, dissolved ethylene would be removed in drum 27.
The feed stream then passes to the midsection of the lower pressure stripper-rectifier tower 11 through line 25, pump 29, and line 30 to the top of the stripping section of the tower.
The dissolved gas removed from the feed stream in drum 27 is discharged through line 28 and a vent condenser 31, and any condensate is returned through line 28 to drum 27.
Heat is supplied to the lower pressure tower 11 by recycling a portion of the tower bottoms stream through line 35, pump 32, line 33, reboiler 34, and line 36
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Molecular Biology 
