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This continuous distillation method is highly effective for large-scale production of spirits. The process involves adding mash in a continuous flow, allowing for steady distillation.

This continuous distillation method is highly effective for large-scale production of spirits. The process involves adding mash in a continuous flow, allowing for steady distillation. The technique goes by various names: Patent still distilling, Continuous distilling, Column still distilling, and Coffey still distilling. The latter is named after Aeneas Coffey, an Irishman who refined the method originally developed by Scotsman Robert Stein in 1826.

The apparatus used in continuous distillation consists of several copper columns, often referred to as column stills. These stills, which can range from two columns for smaller operations

The apparatus used in continuous distillation consists of several copper columns, often referred to as column stills. These stills, which can range from two columns for smaller operations to multiple columns for larger ones, are frequently made from stainless steel. The use of column stills has become widespread due to their ability to produce spirits efficiently and affordably. This method is common in the production of vodka, whisky, and other spirits.

In the distillation process, the mash is placed in the first column, known as the rectification column. Here, it flows down through a screw tube while being heated by steam from the bottom.

In the distillation process, the mash is placed in the first column, known as the rectification column. Here, it flows down through a screw tube while being heated by steam from the bottom. This heat helps separate the ethanol and volatile aroma compounds from the mash. As the liquid moves into the second column, called the analyser, it is passed through copper plates, where the liquid continues to flow downward. The hot vapours rise upwards, cooling as they move through the column, leading to the separation of alcohol and impurities.

The continuous distillation process increases the purity of the spirit as the alcohol vapours circulate through the columns. At the bottom of the second column, the mash residues are removed

The continuous distillation process increases the purity of the spirit as the alcohol vapours circulate through the columns. At the bottom of the second column, the mash residues are removed, and the alcohol vapour returns to the first column. Due to the varying boiling points of substances, different types of liquid are formed during the distillation process, categorized into the forerun, middle run, and post-run. The forerun contains potentially harmful substances and is discarded. The middle run is the desired spirit, typically around 80% alcohol, while the post-run yields a lower alcohol content. Skilled distillers monitor the process carefully, as even minor adjustments in the flow rate can impact the quality of the final product.