ver the years there has been a continual interest 0 i n the equilibrium sorption therms of the various adsorbents. Much of this interest has concentrated on the effect of various parameters on capacity or tests of theories proposed. This is particularly true of activated alumina which we have presently investigated. In some instances, sorption has been measured in the absence of air which from a practical viewpoint is an important factor in the application of adsorbents in packed bed operations.Munro and Johnson",", for example, presented the sorption of isotherms for the alumina-water system at 40, 50, 60 and 80° and for partial pressures of from 23.5 to 72.7 mm Hg. Both the Freundlich and the Patrick equations were applied to interpret the isotherms for 60 and 80°C. But these two equations failed for the isotherm a t 40°C. D e r P ' reported that the temperature developed in the adsorbent by the heat of adsorption may effect the capacity of adsorbent, and that the elimination of this heat increases the capacity of the adsorbent.Gyani and SinhaC4) measured the adsorption and desorption isotherms of water vapor on alumina gel in the temperature range of -3.5 to 25°C and calculated the heats of adsorption with the help of the Clausius-Clapeyron equation.Hysteresis was found in the isotherms of water vapor on alumina gel. Gyani and Sinha indicated that hysteresis extended throughout the entire pressure range and was unusual in this respect.Sanlaville'"' measured the isotherms of water on activated alumina at temperatures from 15 to 55°C and observed the hysteresis phenomenon. The BET theory'"" was applied to explain the isotherms for the relative humidity range from 0.2 to 0.4. Below the value 0.04 he interpreted these isotherms in terms of the Harkins-Jura theory'"'.Recently we developed a digital computer program to analyze the progress of sorption in packed beds'". This program can also be used for design purposes if reliable equations can be found to describe the equilibrium sorption therms over a broad range of temperature and concentration. Raw data and interpolation require too much high speed storage and execution is slow. This aspect represents the weakest link in the program. The heat of sorption can cause the temperature in packed beds to rise from ambient into the 160-200°F range and this has a very pronounced nonlinear mathematical effect on the problem. The concentration of the gas stream can vary from "bone dry" to saturated.The foregoing specifications are too broad for the data appearing in the literature. Moreover, it should be obvious that the "same" adsorbent from one year to the next is not necessarily the same. Improvements in manufacture take place and some investigators even make their own. For these reasons, we decided to work with well known commercial brands that are used in large volume. We started from scratch in an effort to avoid any subsequent controversy about the origin or merits of the material.In the past we have reported on silica gel'"', Florite' 1 I > and Drierite"". In this r...
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