HCl Removal and Chlorine Distribution in the Mass Transfer Zone of a Fixed-Bed Reactor at High Temperature

Abstract

The breakthrough curves and mass transfer zone (MTZ) of the fixed-bed are of great importance. That they are influenced by a number of factors makes the prediction of these a difficult problem. In this study, the HCl removal using sorbent self-prepared has been studied in the fixed-bed reactor. The breakthrough curves near 1 mg/m3 were measured in the 2−10 cm depth of the fixed-bed. The results show that solid sorbents with active species in the fixed-bed reactor are capable of reducing the HCl to very low level at 550 °C, and the breakthrough time is proportional to the depth of the fixed-bed. The critical bed depth is dependent on initial concentration, flow velocity, and chemical reaction parameter. The fixed-bed model based on the assumption for the breakthrough pattern to be constant through the bed is very reasonable for HCl removal. There are three distinct zones within the fixed-bed processes including the saturated zone, mass transfer zone (MTZ), and blank zone. The chlorine distribution in the MTZ can be predicted by the combination of the fixed-bed constant pattern and the grain surface reaction model, which fits the experimental data well.