Distillation system for motor fuel grade anhydrous alcohol

Details Distillation system for motor fuel grade anhydrous alcohol Distillation system for motor fuel grade anhydrous alcohol

1978-11-07

1980-08-12

Yudkoff, Norman

Distillation: processes, separatory

Distilling to separate or remove only water

From organic compound

203 69, B01D 336

Patent

active

042171784

ABSTRACT:
An improved distillation method is provided for obtaining motor fuel grade anhydrous ethanol from fermentation or synthetic feedstocks. A three tower system is used comprising a stripper-rectifier tower in which the dilute feedstock is converted to a concentrated ethanol stream, a dehydrating tower in which water is removed from the concentrated ethanol stream by azeotropic distillation, and a stripper tower for recovering the azeotropic agent. The invention effects substantial energy savings by utilizing the heat content of the overhead vapors from the stripper-rectifier tower to supply the heat required for the dehydrating and stripper towers and by preheating the feedstock in stages utilizing the heat content of the overhead vapors from the dehydrating and stripper towers, the heat content of the overhead vapors from the stripper-rectifier tower and the heat content of the bottoms from the stripper-rectifier tower. Provision is also made for separately removing lower boiling and higher boiling impurities from the stripper-rectifier tower which may be blended into the anhydrous ethanol product from the dehydrating tower.

REFERENCES:
patent: 1702495 (1929-02-01), Clapp
patent: 1822454 (1931-09-01), Ricard et al.
patent: 1830469 (1931-11-01), Keyes
patent: 1860554 (1932-05-01), Ricard et al.
patent: 1982988 (1934-12-01), Gorhan et al.
patent: 2017067 (1935-10-01), Kraft

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