Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1985-02-22
1988-05-24
Sever, Frank
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
159DIG27, 203DIG17, B01D 1300
Patent
active
047464372
ABSTRACT:
The method and apparatus for concentration aqueous solution in accordance with the present invention is characterized in that a hydrophobic porous membrane through which vapor can permeate, but not liquid, is brought into contact with an aqueous solution containing a solute at a concentration of at least 30%, and the water contained in the aqueous solution at the interface with the membrane is evaporated and permeates through the membrane. A method and an apparatus of recovering temperature of an aqueous solution comprising an aqueous solution concentration step in which the aqueous solution contact with the membrane, the water being evaporated; and a dilution step in which the resultant concentrated solution is diluted; wherein a temperature is obtained higher or lower than that of said aqueous solution. The method and apparatus for concentrating an aqueous solution can be used as a means or apparatus for concentrating an aqueous solution in a dilution type of heat pump, an absorption type of heat pump or an absorption type of refrigerator. Aqueous solutions for high-temperature outputs of dilution systems include aqueous solutions of sulfuric acid, nitric acid, etc., and for low-temperature outputs include aqueous solutions of potassium nitrate, sodium nitrate, etc. and further for absorption systems include aqueous solutions of NaClO.sub.3, lithium bromide, etc.
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Ebara Katsuya
Koseki Yasuo
Kuroda Osamu
Kurokawa Hideaki
Takahashi Sankichi
Hitachi , Ltd.
Sever Frank
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