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A still is an permanent apparatus used to distill miscible or immiscible (eg. steam distillation) liquid mixtures by heating to selectively boil and then cooling to condense the vapor. Stills have been used to produce perfume and medicine, Water for Injection (WFI) for pharmaceutical use, generally to separate and purify different chemicals, and most famously, to produce distilled beverages containing ethyl alcohol.

Application

Swan necked copper stills in the Glenfiddich distillery
Zambian artisanal Kachasu still and cooler

Since ethyl alcohol boils at a lower temperature than water, a common application of the process of distillation is to produce strong alcoholic drinks. Usually a still used for this purpose is made of copper, since it removes sulfur-based compounds from the alcohol that would make it unpleasant to drink. Modern stills are made of stainless steel with copper innards (piping, for example, will be lined with copper along with copper plate inlays along still walls). Using this combination of metals is much cheaper as it prevents erosion of the entire vessel and lowers copper levels in the waste product (which in large distilleries is processed to become animal feed). All copper stills will require repairs about every 8 years because of copper erosion from the compounds it is designed to remove; this erosion is therefore unavoidable. The alcohol industry was the first to use anything close to a modern distillation apparatus and led the way in developing what is now a large part of the chemical industry.

There is also an increasing usage of distillation of gin under glass and PTFE, and even at reduced pressures, to facilitate a fresher product. This is irrelevant to alcohol quality, because the process starts with triple distilled grain alcohol, and the distillation is used solely to harvest botanical flavors such as limonene and other terpene like compounds. The ethyl alcohol is relatively unchanged.

The simplest standard distillation apparatus is commonly known as a pot still, consisting of a single heated chamber and a vessel to collect purified alcohol. A pot still incorporates only one condensation, whereas other types of distillation equipment have multiple stages which result in higher purification of the more volatile component (alcohol). Pot still distillation gives an incomplete separation, but this can be desirable for the flavor of some distilled beverages.

If a purer distillate is desired, a reflux still is the most common solution. Reflux stills incorporate a fractionating column, commonly created by filling copper vessels with glass beads to maximize available surface area. As alcohol boils, condenses, and reboils through the column, the effective number of distillations greatly increases. Vodka and Gin and other neutral grain spirits are distilled by this method, then diluted to concentrations appropriate for human consumption.

Alcoholic products from home distilleries is common throughout the world, but is sometimes in violation of local statutes. The product of illegal stills in the United States is commonly referred to as moonshine and in Ireland Poteen.

See also


1911 encyclopedia

Up to date as of January 14, 2010

From LoveToKnow 1911

STILL. (I) (0. Eng. stille, a word appearing in many Teutonic languages, all derived from the root, meaning to set in position or rest, seen in "stall," Ger. stellen, &c.), motionless, noiseless, or when used of wines or mineral waters, having little or no effervescence. As an adverb, "still" has preserved the original sense of "that which preserves its position," and thus means continually, permanently, now as before. (2) From the shortened form of "distil," Lat. distillare, to drip, trickle down, stilla, a drop, dim. of stiria. The older word for a "still" in English was stillatory, Medieval Latin stillatorium, an apparatus for heating substances and condensing the vapours (see Distillation and Spirits).


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Simple English

]] A still is a tool used to clean a liquid. It does this by first boiling the liquid and turning it into a gas. This gas is then cooled, changing it back into liquid. Stills get their name from the word distillation. Distillation is the process of boiling and cooling a liquid to purify it. Stills are most often used to create alcohol, but they can also be used with any liquid. Some examples are medicines and perfumes.

There are two main types of stills: pot stills and reflux stills. In a pot still, the pot (like a large kettle) holding the liquid is heated. The hot gas is cooled in a simple neck, or tube, and collected.[1] Pot stills are used for making alcohol like whisky. A reflux still is much more complex. It works with a continual flow of liquid going into the boiler, and a continual flow of distilled liquid coming out. The distilled liquid can also be put through the process several times, which is why it is called a reflux still. This allows for a more pure product, and the person working the still can control the level of purity.[2] Reflux stills are used in the chemical and petroleum industries.

References








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