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Abstract
The efficiency of screen packings in the distillation of a model benzene-toluene mixture at total reflux was assessed in a 1200-mm diameter column with gas crossflow. The packings were tested at 100-110 C and 110-133 kPa and liquid feed rates of 2.5-14 cubic meters per hour. Compositions of samples withdrawn from the packings were determined chromatographically and these data were used to calculate the number of theoretical plates under total reflux with the Fensek-Underwood equation. Mass transfer efficiency of the crossflow packings was found to increase with increasing vapor and liquid load and to depend also on the dimensions of the packings. When the reflux load was increased from 12.9 to 44.5 cubic meters per hour, the efficiency changed very little, indicating a broad range of stable operation for the crossflow system.
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