Which distillation method is characterized by sequential distillation columns for higher purity?

The column still, also known as a continuous still or patent still, is designed for the production of high-purity spirits through a process that involves multiple distillation columns. This method allows for the separation of alcohol from other components of the fermented mash more efficiently than other methods because of its continuous operation and sequential distillation capabilities.

During operation, the mash is introduced at the top of the column, and steam passes through it. This creates a vapor that rises through the column while interacting with descending liquid that has a higher concentration of impurities. As the vapor rises, it gradually increases in purity, with lighter alcohol vapors being collected at the top, leaving behind heavier components. This multiple-step process enables the column still to achieve higher proof levels and greater purity in the resulting distillate compared to other distillation methods, which may require multiple runs and batch processing.

In contrast, pot stills are typically used for producing traditional spirits where some impurities can add character, while hybrid and batch stills may utilize elements of both designs but do not focus primarily on achieving high purity through sequential column distillation as effectively as the column still does. Thus, the column still is recognized for its efficiency and effectiveness in producing spirits with a high level of purity.