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In this study,a lab-sized distillation experiment was conducted using small-size packings and a horizontal distillation column.Raschig ring type 6.7 mm packings of stainless steel and a 40 mm glass column were used,and independent electric heaters were installed in the axial direction to adjust the column inside temperature separately.The temperature was continuously distributed along the column length to provide an equivalent equilibrium to the temperature for the separation.From the experimental results,a larger HETP of the column than the vertical distillation column was obtained,but it was found that the practical separation with proper processing capacity and separation efficiency was available.