Reflux is a technique involving the condensation of vapors and the return of this condensate to the system from which it originated. It is used in industrial  and laboratory  distillations. It is also used in chemistry to supply energy to reactions over a long period of time. The term reflux    is very widely used in industries that utilize large-scale distillation columns and fractionators such as petroleum refineries, petrochemical and chemical plants, and natural gas processing plants. In that context, reflux refers to the portion of the overhead liquid product from a distillation column or fractionator that is returned to the upper part of the column as shown in the schematic diagram of a typical industrial distillation column. Inside the column, the downflowing reflux liquid provides cooling and condensation of the upflowing vapors thereby increasing the efficiency of the distillation column.
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