Supercooling and Column Stability

Hot vapor rises in a compound still to be condensed and returned to the column as reflux. How cold can this reflux be before operation of the column is upset?

Most people's initial reaction is to say, "Very little cooling can be tolerated - it may upset the equilibrium, and will certainly change the reflux ratio." This response is so common that it is almost unquestioned, and some people have gone to great lengths to design still heads to minimize reflux cooling. What can theory tell us about this?

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