Distillation is a method of separation of substances based on differences in their volatilities.
Known since antiquity, the concentration of alcohol by the application of heat to a fermented liquid solution is perhaps the oldest form of distillation, in the course of producing distilled beverages. However, the technique is now widely used for a variety of liquids in the chemical industry and in the production of petroleum products, among other fields.
The liquid solution evaporates, such that the vapor has a composition determined by the chemical properties of the solution. In distillation, the mixture is boiled to effect sufficient evaporation. Distillation of a given component is possible if the vapor has a higher proportion of the given component than the solution. This is another way of saying that one component has a higher volatility, due to a higher vapor pressure in the operating temperature. Although a higher vapor pressure correlates with a lower boiling point, it is important to note that distillation does not use the different boiling points of pure components. Most mixtures are nonideal: they boil at different temperatures from their components, and significant evaporation takes place around the boiling point, not just at it. It is more accurate to say that given a boiling mixture, its composition is more important in predicting the separation efficiency than the boiling point of a free individual component.
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The Home Distillation Handbook - Describes how to make alcoholic spirits at home.
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Yahoo! Groups: Distillers - Mailing list for the exchange of information and experiences relating to the process of producing alcohol at home, with an emphasis on spirit distillation.
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Yahoo! Groups: New Distillers - Mailing list for anyone new to distilling to ask questions and share information and techniques.
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