Low energy vacuum distillation method and apparatus
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United States of America Patent
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Oct 7, 2008
Grant Date -
Aug 18, 2005
app pub date -
Jan 13, 2005
filing date -
Sep 20, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sub-atmospheric pressure desalinating still employs a closed top, open bottom pipe filled with source water to be distilled, such as seawater, having a height greater than the height of a column of seawater that can be supported by the pressure at the bottom of the tank so that a subatmospheric pressure volume is formed at the top. Water from the source is also pumped into the subatmospheric volume and passed through an evaporator which enlarges its surface volume. A small percentage of the water is vaporized and the balance is cooled to provide the heat of vaporization and falls into the top of the seawater column, creating a downward flow. The vapor is drawn from the vacuum and condensed, preferably in a second subatmospheric volume above a column of fresh water.
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