INVESTIGATION OF THE GAS MIXTURE ADSORPTION PROCESS IN A FIXED LAYER OF THE NaX ADSORBENT

Abstract

The paper describes a 4-adsorbent installation for cleaning gas mixtures from H2S, CO2 and NO2 with zeolite. The lower and upper limits of the condensate level in the separator were controlled by electric contact pressure gauges, and the pressure was recorded on the operator panel. The number of adsorbers is 4, the height of the fixed zeolite layer is 3.6 m. Long-term operation of the adsorption unit under real operating conditions has shown that the temperature of zeolite regeneration largely depends on the quality of the gas entering the adsorption unit. As can be seen, the desorption of carbon dioxide is completed at the beginning, then hydrogen sulfide, and at the end - moisture vapor, and the time for complete desorption of all adsorbed components is limited by internal diffusion inhibition of the sorbed components. The greatest desorption time, as expected, is due to moisture vapors. It has been experimentally established that when heated with hot gas at the maximum permissible speed, the time for complete desorption of moisture is 150-160 minutes. For practical calculations, the time required for complete dehydration of the zeolite is taken at least 3 hours, which is confirmed experimentally. Keywords: adsorption, synthetic zeolite NaX, fixed adsorbent layer, gas mixture, desorbed substances.