Vacuum Distillation One of the most common and effective methods is vacuum distillation, which operates on the principle of lowering the boiling point of alcohol. In this method, the fermented beer is pushed through a semi-permeable membrane under high pressure.
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Brewers start by selecting high-quality malted barley, hops, yeast, and water, combining them to create a wort that is rich in fermentable sugars. Spinning cone columns use a rotating apparatus to separate volatile compounds from the beer, which are then selectively removed.
The separated alcohol and water are often recombined and removed from the system, while the concentrated beer flavors are returned to the main batch. This gentle process helps preserve the delicate volatile compounds responsible for hop aroma and malt character.
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By reducing the pressure within a sealed chamber, brewers can gently heat the beer to a temperature where the alcohol evaporates at around 30°C to 40°C, well below the boiling point of water. Reverse Osmosis Reverse osmosis offers a more contemporary, filtration-based approach that is gaining popularity for its precision.
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