Separation of methylene chloride from the lower alcohols by extr

Details Separation of methylene chloride from the lower alcohols by extr Separation of methylene chloride from the lower alcohols by extr

1991-03-27

1992-10-06

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 58, 203 59, 203 60, 203 61, 203 62, 203 63, 203 64, 568913, 568918, 570262, B01D 340, C07C 1738, C07C 2984

Patent

active

051528762

ABSTRACT:
Methylene chloride cannot be completely separated from methanol or ethanol by conventional distillation or rectification because of the mimimum boiling azeotrope. Methyelne chloride can be readily separated from methanol or ethanol by azeotropic or extractive distillation. Typical effective agents are: for methanol by azeotropic distillation, isopropanol or t-butanol; by extractive distillation, 1-nitropropane or n-butanol; for ethanol by extractive distillation, isobutanol or n-propyl acetate.

REFERENCES:
patent: 1566819 (1925-12-01), Carter
patent: 2856331 (1958-10-01), Rosenthal et al.
patent: 2865955 (1958-12-01), Ascherl et al.
patent: 5051153 (1991-09-01), Berg

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