THE ADSORPTION PROPERTIES OF ACTIVE CARBON

I. GAS CHROMATOGRAPHIC STUDY ON THE SURFACE EFFECTIVENESS OF ADSORPTION

Abstract

Applying the theory and the technique of gas chromatography, adsorption effectiveness of surface was studied on a pulse flow system of active carbon and acetone. The adsorp-tion effectiveness "f" was defined as the ratio of the following two distribution coefficients at the same vapor pressure and temperature; one (μ1) was for the pulse flow adsorption obtained gas chromatographically and the other (μ2) was that for the adsorption equilibrium from the adsorption isotherm measurements. Gas chromatographic observations were carried out on the column packed with active carbon, and under helium carrier gas, liquid acetone of 0.05 ml, 0.10 ml and 0.20 ml was injected respectively.
Values of μ1 varied with sample volumes, whereas the μ2 values were remained con-stant in this experimental conditions, in which the vapor pressure was as low as 10-2 to 10-4 mmHg. Consequently the adsorption effectiveness of the surface "f" varied with the change of μ1 values, and the maximum obtained was 53% at the smallest sample volume and the higher temperature.
The ratio of "f" to the gas-solid contact time was almost constant in this experimental range. This fact indicates that the "f" increases with increasing contact time. Greater ratio of surface effectiveness to contact time at 72°C may be due to higher adsorption velocity at higher temperature.