Liquid purification or separation – Casing divided by membrane into sections having inlet – Energy recovery from treated liquid
Patent
1977-03-21
1978-09-26
Hart, Charles N.
Liquid purification or separation
Casing divided by membrane into sections having inlet
Energy recovery from treated liquid
210493M, 264257, B01D 2904, B01D 3100
Patent
active
041168410
ABSTRACT:
A mass transfer apparatus is disclosed comprising a housing, preferably rectangular, a semipermeable membrane disposed within said housing, said membrane being folded to form a stack of accordion pleats over the whole internal surface of the bottom of said housing, one or more support members being disposed within every pleat on one side only of said membrane, all edges of said membrane being embedded in plastic embedding material within said housing so that the membrane thereby forms two fluid compartments with ports allowing the flow of a fluid in each compartment, the creases of said membrane pleats being collapsed upon said support members and, at their ends, being sharply folded upon themselves and deeply penetrating into the embedding material along a longitudinal side of the housing. The creases which sharply fold upon themselves have a bi-concave external shape. A method of manufacturing the apparatus is also disclosed, comprising the following steps:
(a) Making up an assemblage comprising a semipermeable membrane folded in an accordion-like manner into a number of closely spaced pleats around support members inserted on one side of said membrane;
(b) Sealing certain edges of the membrane along substantially their whole length to form a first fluid-tight compartment disposed on the same side of the membrane as the support members and provided with at least one port, the pleats formed around the support members being in communication with the outside through such port;
(c) Connecting said first compartment to a vacuum source and drawing a vacuum in said first compartment to collapse the membrane pleats about the edges of the support members along one side of the accordion stack, after first treating such membrane pleats with a suitable softening agent to increase the pliability of the membrane, where such softening treatment is deemed necessary or desirable; and
(d) Applying a solidifiable fluid plastic material over the longitudinal face of the stack, on the side where the membrane pleats are both open and without exposed support members, and solidifying said plastic material to embed the membrane pleats in such collapsed condition, thus forming a second compartment with at least one port and without bypass channels.
REFERENCES:
patent: 3788482 (1974-01-01), Markley
patent: 3827565 (1974-08-01), Matsumura
American Hospital Supply Corporation
Hart Charles N.
Honor Robert S.
Jewell Walter F.
Sadowski David R.
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