Experimental and modelling approach to the design of chemical absorption columns with fast gas-liquid reaction: A case-study on flue-gas desulfurization with H2O2 oxidative solutions

烟气脱硫 烟气 化学 吸收(声学) 废物管理 氧化磷酸化 化学工程 工艺工程 材料科学 工程类 有机化学 生物化学 复合材料
作者
D. Flagiello,Francesco Di Natale,Amedeo Lancia,I. Sebastiani,F. Nava,A. Milicia,Alessandro Erto
出处
期刊:Chemical Engineering Research & Design [Elsevier BV]
卷期号:194: 425-438 被引量:11
标识
DOI:10.1016/j.cherd.2023.04.040
摘要

In this work, we propose a methodology to approach the design of chemical absorption columns with fast gas-liquid reactions by an experimental and modelling study, which accounts for thermodynamic (solubility) data, mass-transfer phenomena, and the reaction kinetics contribution. As a reference case, the SO 2 absorption in aqueous solution of H 2 O 2 at different concentrations, which oxidizes SO 2 to sulfuric acid, is considered. A lab-scale fed-batch bubble column is used to evaluate SO 2 solubility dataset in absorbing solutions of distilled water containing different dosages of H 2 O 2 . A thermodynamic model is developed and validated in a Thermodynamic Flash block of ASPEN PLUS®, allowing to describe the experimental results with optimum agreement. For kinetic experiments, a lab-scale falling-film absorber is used to investigate both SO 2 mass-transfer rates and the fundamental kinetic aspects of an absorption process with chemical reaction. The physical contribution to the mass-transfer rate is evaluated through a set of dedicated experiments, which allowed determining gas-side ( k G a ) and liquid-side ( k L a ) coefficients in the falling-film absorber. Subsequently, the Enhancement factor ( E L ) of the SO 2 oxidative absorption is evaluated for the oxidizing reaction (SO 2 + H 2 O 2 → H 2 SO 4 ) under the explored experimental conditions, using the equilibrium dataset and the mass transfer coefficients previously obtained. Finally, E L is correlated to the Hatta number ( Ha ) with the Danckwerts kinetic model as a pseudo-m th -n th -order non-reversible reaction type and the model kinetic parameters are calculated. • This work provides an experimental and modelling approach to the design of reactive absorption columns. • The thermodynamic model developed in ASPEN PLUS provides a proper estimation of the SO 2 -H 2 O 2 solubility dataset. • The kinetic experiments allowed assessment of the reaction kinetic parameters in the gas absorption of SO 2 into H 2 O 2 . • The kinetic model based on the Danckwerts equation provides a proper estimation of the Enhancement factors.
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