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A pit still may be too inefficient as a survival still, because of the energy/water required for construction. [9] In desert environments water needs can exceed 3.8 litres (1 US gal) per day for a person at rest, while still production may average only 240 millilitres (8 US fl oz).
Solar stills of this type are described in survival guides, provided in marine survival kits, and employed in many small desalination and distillation plants. Water production is proportional to the area of the solar surface and solar incidence angle and has an average estimated value of 3–4 litres per square metre (0.074–0.098 US gal/sq ft ...
Laboratory model of a still. 1: The heat source to boil the mixture 2: round-bottom flask containing the mixture to be boiled 3: the head of the still 4: mixture boiling-point thermometer 5: the condenser of the still 6: the cooling-water inlet of the condenser 7: the cooling-water outlet of the condenser 8: the distillate-receiving flask
Whereas a single pot still charged with wine might yield a vapour enriched to 40–50% alcohol, a column still can achieve a vapour alcohol content of 96%; an azeotropic mixture of alcohol and water. Further enrichment is only possible by absorbing the remaining water using other means, such as hydrophilic chemicals or azeotropic distillation ...
Slingshot is a water purification device created by inventor Dean Kamen. [1] Powered by a Stirling engine running on a combustible fuel source, it claims to be able to produce drinking water from almost any source [2] by means of vapor compression distillation, [3] requires no filters, and can operate using cow dung as fuel.
A still is an apparatus used to distill liquid mixtures by heating to selectively boil and then cooling to condense the vapor. [1] A still uses the same concepts as a basic distillation apparatus , but on a much larger scale.
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