Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1982-05-27
1983-10-11
Evans, J. E.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568913, 568918, C07C 2976, C07C 2980, C07C 2982, C07C 2986
Patent
active
044094060
ABSTRACT:
A thermally efficient process for recovering ethanol present in dilute aqueous solution is disclosed which comprises contacting said dilute aqueous ethanol solution with at least one inert extractant which is liquid at ambient temperature and pressure, said extractant being selected from the group consisting of unsubstituted and substituted cyclic secondary amines and unsubstituted and substituted aromatic cyclic amines having a distribution coefficient of at least about 0.70 or a separation factor of at least about 1.0. The invention further provides a process for obtaining substantially anhydrous ethanol from a dilute aqueous ethanol solution in which the ethanol stream is subjected to liquid-liquid extraction to provide an ethanol-poor raffinate phase and an ethanol-rich extract phase, the ethanol present in said latter phase is concentrated in a rectifing column to provide an aqueous ethanol of high proof and the concentrated ethanol is azeotropically distilled in an anhydrous column operated under substantially superatmospheric pressure with thermal values recovered from said anhydrous column being used to satisfy part of all of the thermal operating requirements of the rectifying column.
REFERENCES:
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patent: 4260836 (1981-04-01), Levy
patent: 4308106 (1981-12-01), Mannfeld
Roddy, "Ind. Eng. Chem. Process Des. Dev.", vol. 20, No. 1, 1981, pp. 104-108.
Evans J. E.
National Distillers and Chemical Corporation
Tremain Kenneth D.
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