Distillation: processes – separatory – Plural distillations performed on same material – Distillation of initial distillate
Patent
1975-04-29
1978-10-03
Bernstein, Hiram H.
Distillation: processes, separatory
Plural distillations performed on same material
Distillation of initial distillate
203 86, 203 87, 261113, B01D 314
Patent
active
041182855
ABSTRACT:
Herein are disclosed an improved method and apparatus for separating a mixture of liquids of differing volatilities by fractional distillation in a plate-type apparatus. Plates consisting at least in part of a porous structure having capillary-type passages extending between openings on one side of the plate and openings on the other side of the plate are employed. The capillary-type passages are adapted to be wetted and filled at least in part by the liquid condensate resulting from the condensation of a vapor mixture, with the consequent formation of menisci in the capillary-type passages and the generation of capillary pressures that cause the condensed liquid to be lodged within the capillary-type passages and transmitted through the plate while preventing the passage of vapor. A vapor mixture produced by boiling the liquid mixture is brought into contact with one side of the plate containing capillary-type passages, where the vapor mixture is substantially condensed in and near the adjacent openings of such passages, and the condensed liquid is transmitted through the passages to the other side of the plate where it is boiled substantially in and adjacent to the openings of such passages. The capillary pressure differential required to cause the condensed liquid to flow is produced by the boiling of the condensed liquid, and the heat required for such boiling preferably is obtained at least in substantial part by conduction of the heat of condensation through the plate. One or more separation stages can be employed, and plate efficiencies (Murphree) of 100 per cent or more are obtainable.
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Bernstein Hiram H.
Drobile James Albert
Villanova University
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