The effect of foaming on the performance of 16 mm Pall rings was determined in a 0.15 m distillation column with a ‘bed depth of 1.23 m. The tests were conducted with the methanol/water system at 1.0 bar pressure. A controllable foaming inside the packed bed was generated successfully with the addition of the surfactant, Triton X-100, to the reflux stream. The performance of the packing with an...