Dynamic modelling of periodically wetted catalyst particles

Unsteady-state operation of trickle-bed reactor for dicyclopentadiene hydrogenation

“…PEAK--BASE and ON--OFF modes were advantageous for liquid and gas reactant limited reactions, respectively Castellari and Haure (1995), Gabarain et al (1997), Khadilkar et al (1999Khadilkar et al ( , 2005, Turco et al (2001), Banchero et al (2004), Urseanu et al (2004), Lange et al (1994Lange et al ( , 1999Lange et al ( , 2004, Sicardi et al (2005), Dietrich et al (2005) (2) Quasi-steady-state model for slow mode; a phenomenological model that incorporates different transport and reaction mechanisms occurring on catalytic particle under different cycling time; a one-dimensional reactor and catalyst pellet scale flow-transport-reaction model utilizing multi-component Stefan--Maxwell formulation for inter-and intraphase transport; a systematic evaluation of dynamic particle-scale modeling approaches based on various intraparticle concentration profiles and periodic wetting of the external particle surface Oxidation of SO 2…”

“…The researchers developed several mathematic models (Lange et al, 1999;Khadilkar et al, 2005;Dietrich et al, 2005;Haure et al, 1990Haure et al, , 2005 dealing with unsteady-state behaviors with different approaches, the key features of which are also summarized in Table 1. Thought most of those models took the partial wetting of catalyst pellets into consideration, catalyst surface was invariably divided into dry zone and wetted zone, which omitted the important role of static liquid hold during OFF (or BASE) section of a cyclic period.…”

Applications of tomography in bubble column and trickle bed reactors

“…One approach that has been proposed to improve the performance of a trickle bed reactor is to operate in a periodic regime, whereby the flow rate of the gas or liquid feed is increased periodically (Silveston, Hudgins, & Renken, 1995). Numerical models have been presented to describe this periodic operation (Dietrich, Gr€ unewald, & Agar, 2005;Kouris, Neophytides, Vayenas, & Tsamopoulos, 1998); however, such models require an accurate description of the dynamic behaviour of flow of liquid and gas over the catalyst particles. MRI studies of periodic operation demonstrate that periodic operation leads to a heterogeneous distribution of liquid contacting in the pores of the reactor (Anadon, 2006;Lim, Sederman, Gladden, & Stitt, 2004).…”

Heterogeneous Modeling Approach for Gas‐Limited Reactions in an Inclined Rotating Fixed Bed Reactor

“…Additionally, simulations are carried out with second order kinetics considering also the AMS concentration. For this purpose, the kinetic rate constant b was estimated using different Thiele moduli f according to [11] f ¼ s Pd…”