Advanced Shrinking Particle Model for Fluid-Reactive Solid Systems

• Main Authors: Vincenzo Russo, Henrik Grénman, Tommaso Cogliano, Riccardo Tesser, Tapio Salmi
• Format: Article
• Language: English
• Published: Frontiers Media S.A. 2020-10-01
• Series: Frontiers in Chemical Engineering
• Subjects: modeling; shrinking particle; reactive solids; ESFM; film theory
• Online Access: https://www.frontiersin.org/article/10.3389/fceng.2020.577505/full

In the present work, the extended shrinking film model (ESFM) was applied to a reversible reaction in which a solid dissolves and reacts with a component present in the liquid phase. The model considers the reactive solid dissolution in the liquid phase and the diminishing of its radius with the reaction time. Furthermore, the liquid film surrounding the particle, through which the liquid component diffuses to react with the dissolved solid, is considered radius dependent; thus, the model is based on the mass balance equations derived for the solid surface, liquid bulk, and the liquid film. The model consists of two ODEs and a PDE, solved numerically with gPROMS ModelBuilder 4.0. It was demonstrated that the model can cover a wide range of operation conditions, and it shows a high degree of flexibility, allowing the application to several kinds of solid-fluid processes, such as esterification, gasification, and steam cleaning for the removal of dangerous and polluting gases (CO2, SO2) from the main process stream and NO capture.