Production of purified water and high value chemicals from salt water
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United States of America Patent
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Aug 1, 2006
Grant Date -
Mar 25, 2004
app pub date -
Aug 1, 2003
filing date -
Aug 2, 2002
priority date (Note) -
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Abstract
Sodium chloride and purified water are recovered by treating salt water that contains sodium chloride with an integrated reverse osmosis and electrodialysis system, which includes an efficiency-enhancing feature that is one or more of the following: the use of univalent anion and univalent cation selective membranes in the electrodialysis unit; the addition of a nanofiltration unit to process the diluate from the electrodialysis unit; or operation of the electrodialysis unit at an elevated pressure. Magnesium and bromine can optionally be produced when the salt water contains these materials.
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