Distillation method and apparatus for making motor fuel...

Details Distillation method and apparatus for making motor fuel... Distillation method and apparatus for making motor fuel...

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B01D 3/36 (2006.01) B01D 3/00 (2006.01) B01D 3/14 (2006.01) B01D 3/32 (2006.01)

Patent

CA 1119995

ABSTRACT DISTILLATION METHOD AND APPARATUS FOR MAKING MOTOR FUEL GRADE ANHYDROUS ALCOHOL An improved distillation method and apparatus are 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 dehydra- ting tower in which water is removed from the concen- trated 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 stipper 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.

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