Journal of Chemical Engineering of Japan, Vol.48, No.3, 202-211, 2015
The Adsorption and Desorption Breakthrough Behavior of Hydrogen Chloride Gas Mixture on Zeolite 13X Pellet in a Fixed Bed Reactor
The adsorption and desorption breakthrough test of hydrogen chloride (HCl) was performed by loading zeolite 13X pellet (molecular sieve 13X, Aldrich Co., U. S. A.), a commercial adsorbent, onto a fixed bed reactor (height 15 cm, inside diameter 0.5 cm). The breakthrough test was carried out by changing various experimental conditions such as inlet flow rate (0.5, 1, 1.5, 2 L/min), HCl concentration (200, 350, 500, 650 ppm), reaction temperature (30, 50, 70, 90 degrees C), and reaction pressure (1, 5, 10, 15, 20 bar) with considering the retention time and space velocity. After evaluating the adsorption and the desorption characteristics of HCl on the MS-13X, the consecutive cyclic test (5 times of adsorption step, 4 times of desorption step) was carried out with optimum condition. At the adsorption step, pressure was 20 bar, temperature was 30 degrees C, HCl concentration was 200 ppm, total inlet flow rate was 0.5 L/min (HCl + N-2). At the desorption step, pressure was 1 bar (atmospheric pressure), temperature was 280 degrees C, total inlet flow rate was 0.5 L/min (N-2 only), desorption time (regeneration time) was 7 h. The optical, physical, and chemical characteristics of MS-13X were analyzed using BET, XRD, SEM, EDX, and TGA before and after breakthrough tests.