A bench scale thermal-swing adsorption (TSA) system was designed and assessed to adsorb and desorb p-xylene from a gas stream. The bench unit consists of a gas generation system, a desorption system, an adsorption and desorption column, and a gas detection and data acquisition system. P-xylene at concentrations of 4 g/m3 and 6.7 g/m3 in air was adsorbed on granular activated carbon (GAC) at flow rates ranging from 3-5 Lpm. The removal efficiency was greater than 99% at these conditions. Desorption was performed by increasing the temperature of the carrier gas under controlled conditions. At the end of 750 minutes, p-xylene removal increased from 0.614 g at ambient temperature to 1.625 g at varying temperatures. During desorption, concentration fluctuated near 500 ppmv for over 400 minutes. Results are encouraging to dampen fluctuations of volumetric flow rate and concentration of p-xylene while achieving desirable inlet parameters for a biofiltration system.
January 22, 2016
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