Kinetic Modeling of Isothermal or Non-isothermal Adsorption in a Pellet: Application to Adsorption Heat Pumps

Ludovic Montastruc (1, 2) , Pascal Floquet (2) , Volker Mayer (3) , Iordan Nikov (1) , Serge Domenech (2)

1 ProBioGEM - Laboratoire de Procédés Biologiques, Génie Enzymatique et Microbien
2 LGC - Laboratoire de Génie Chimique
3 LPP - Laboratoire Paul Painlevé - UMR 8524

Understanding the interaction between a fluid and a solid phase is of fundamental importance to the design of an adsorption process. Because the heat effects associated with adsorption are comparatively large, the assumption of isothermal behavior is a valid approximation only when uptake rates are relatively slow. In this article, we propose to determine when it is needed to choose the isothermal or non-isothermal assumption according to two physical parameters alpha (ratio convection/capacity) and beta(quantity of energy/capacity). The proposed problem is solved by a mathematical method in the Laplace domain. When alpha-> infinite (infinitely high heat transfer coefficient) or beta->0(infinitely large heat capacity), the limiting case is isothermal. When the diffusion is rapid (alpha<10) the kinetics of sorption is controlled entirely by heat transfer. If the adsorption process is to be used as a heat pump, it shall be represented by an isotherm model with alpha and beta as high as possible.

Mots clés: Adsorption; Non-isothermal; Energy; Pellet

Domaines: Génie chimique

Ludovic Montastruc, Pascal Floquet, Volker Mayer, Iordan Nikov, Serge Domenech. Kinetic Modeling of Isothermal or Non-isothermal Adsorption in a Pellet: Application to Adsorption Heat Pumps. Chinese Journal of Chemical Engineering, 2010, 18 (4), pp.544-553. ⟨10.1016/S1004-9541(10)60257-1⟩. ⟨hal-03554067⟩