关键词: 微纤维, 活性炭, 苯蒸气, 吸附动力学

Abstract: Microfibrous entrapped sorbent（MFS）with nickel fibers was prepared by a traditional wet paper making/sintering process，and a double-layer bed is composed of MFS and conventional packed bed (PB) of granular activated carbon (GAC). The adsorption behaviors of benzene vapor in fixed bed at various challenge concentrations are studied. The unused layer depth and adsorption capacity of the bed are calculated using Shilov's equation. Yoon-Nelson equation is used to simulate the breakthrough behaviors of both single- and double-layer fixed beds. The results show that, for both GAC bed and double-layer fixed bed, the unused layer depth and adsorption capacity decrease with the decrease of the challenge concentration. The adsorption efficiency of double-layer fixed bed with benzene vapor is significantly improved compared with GAC bed at the same concentration ratio and flow rate, owing to that the mass transfer efficiency of double-layer bed is improved by MFS at the end of air flow. The results also show that the theoretical curves agreed with the experimental data very well. Key

Key words: microfiber, activatedcarbon, benzenevapor, adsorptionkinetics