No abstract

The purpose of this study was to compare Murphree efficiencies of various valve trays to those of sieve trays, for 18-in. and overall efficiency for larger diameter columns. Within the accuracy of the available basic data, effects of component surface tension differences and component molar latent heat of vaporization differences were observed. The valve tray types studied exhibited a higher average operating efficiency and greater turndown ratio than the sieve tray studied. The binary system which demonstrated a positive deviation from neutrality by both Zuiderweg's definition of surface tension effects and Todd's definition of molar latent heat of vaporization effects exhibited a higher operating efficiency than did the negative binary system. Efficiency plots determined for all the valve trays studied were quite similar. The only major difference in these plots was a slight shift in average efficiency between the different valve trays.