TW341523B - A new desalination method by multi-stage pervaporation - Google Patents

Abstract

A desalination method by multi-stage pervaporation, which uses a plurality of pervaporation chambers, the interiors of which are separately divided into a sea water zone at a higher temperature, a condensation zone and a sea water zone at a lower temperature by a membrane (porous and hydrophobic membrane) and cooling walls; furthermore, serially and sequentially introducing sea water at a higher temperature into the sea water zone at a higher temperature of each pervaporation chamber, and serially and sequentially introducing sea water at a lower temperature into the sea water zone at a lower temperature of each pervaporation chamber, such that vapor of the sea water at a higher temperature will permeate through the membrane (porous and hydrophobic membrane) and condense on the cooling wall into water and flow out from the condensation zone as desalinated water where the sea water at a lower temperature is flowing on the other side of the cooling wall; next, the desalinated water flowing out from each pervaporation chamber will separately flow into heat exchangers (61)~(64) to be cooled and recycled for the heat contained therein, and the heat exchangers (61)~(64) will sequentially and serially collect the desalinated water to an accumulator.