Effect of Pressure on HCl Absorption Behaviors of a K-based Absorbent in the Fixed Bed Reactor

Abstract

주제어 : 염화수소, 고정층반응기, K-계열 흡수제, 압력, 연소전포집 Abstract : In this study, the hydrogen chloride removal using K-based dry sorbents (K2CO3/Al2O3, KEPRI, Korea) was studied with varying the pressure in a fixed bed reactor (15 cm tall bed with 0.5 cm I.d.). Working temperature was 400℃ and feed gas concentration was 750 ppm (HCl vol%, N2 balance). The chloride sorption capacity of sorbent increases with increasing pressure (1, 5, 10, 15 and 20 bar). Also, after forming KCl crystal by reaction with K2CO3 and HCl, owing to the strong bonding energy, sorbent regeneration was practically impossible. Its optical, physical and chemical characterizations were evaluated by SEM, EDAX, BET, TGA and XRD. At 400 ℃ and 20 bar condition, working condition for the dehalogenation process after gasification, K-based dry sorbent showed high HCl sorption capacity and HCl/N2 separation performances comparing with Ca-based and Mg-based dry sorbents.

The Absorption Breakthrough Characteristics of Hydrogen Chloride Gas Mixture on Potassium-Based Solid Sorbent at High Temperature and High Pressure

“…However, related researches are hardly found so far. The reaction path is as follows: K 2 CO 3 + 2HCl → 2KCl + CO 2 + H 2 O. Kim et al carried out a HCl breakthrough test using a K 2 CO 3 impregnated dry sorbent, and it was confirmed that the optimum sorption property was at the highest pressure and temperature conditions (20 bar and 400 °C) . Kim et al also reported HCl breakthrough behaviors of zeolite 13X pellet at low temperature condition .…”