.
76
T/ze Last Re“souræ
Advances in the late 19508, particularly by the British company
Weir Westgarth, were soon to make the submerged—tube system
obsolete. In 1957 Professor R. S. Silver patented a new advance in
;*
another distillation process, ash distillation. Flash distillation
works on the principle that water subjected to a lower pressure than
i
normal boils at a lower temperature—the kind of problem met by
'
mountaineers when they “try to make a good cup of tea or coffee.
When heated sea—water is fed into a low—pressure chamber, steam
if
‘ashes’ out of solution leaving behind cooler and more salty brine.
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heat
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water,_%
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pressure
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It is notdiicult to see that if this bri6i$ passed gto acharnber at an
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even lower pressure mOre
Îjustj as in pool
…
distillation, in—coming _
used to ç0ndçnse the steam, and
-
pt0 conserve heat
far more water… äfhan ca…
cooling water. «receive-‘s a
lating brine,
the rst low-pressure chamber
the
the remainder is rejected (see g”QŒ4)»}The-basic',‘S€QÊËË:OÊPIÔÎCSSQI
SilverÏÏssucœss was in determining the number pf, stageS;required
forthemostœeliicient performance,…
units. mwluch distillation and
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lox‘ifertemperatures land
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