Modelling of a Simulated Moving Bed in case of non-ideal hydrodynamics. (22nd October 2016)

• Record Type: Journal Article
• Authors: Fangueiro Gomes, L.; Augier, F.; Leinekugel-le-Cocq, D.; Vinkovic, I.; Simoëns, S.
• Is Part Of: Chemical engineering science. Volume 153(2016)
• Page Start: 188
• Page End: 198
• Publication Date: 2016-10-22
• Subjects: 2MENCSTR multiple entrances and multiple exits NCSTR models -- CFD Computational Fluid Dynamics -- CSTR Continuous Stirred-tank Reactor -- DPF dispersed plug flow -- EB ethylbenzene -- LDF linear driving force -- MX m-xylene -- NCSTR cascade of N CSTR -- NTP number of theoretical plates -- OX o-xylene -- PDEB p-diethylbenzene -- PET polyethylene terephthalate -- PFR Plug Flow Reactor -- PSA Pressure Swing Adsorption -- PUR purity -- PX p-xylene -- RANS Reynolds-averaged Navier-Stokes -- REC recovery -- RTD Residence Time Distribution -- SMB Simulated Moving Bed; Adsorption -- CFD -- Simulated Moving Bed -- 1D modelling; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2016.07.027
• Languages: English
• ISSNs: 0009-2509

Abstract

Abstract: The one-dimensional hydrodynamic model proposed by Gomes et al. (2015) is coupled with adsorption and validated by comparing the concentration profiles of the one-dimensional model with those given by the CFD model of one adsorption column including obstacles as distribution network and beams. This one-dimensional model is capable of predicting the CFD results for different mass transfer rates, while the traditional dispersed plug flow (DPF) model is relevant for slow mass transfer rates only. The model proposed by Gomes et al. (2015) is capable of reproducing the adsorber Residence Time Distribution (RTD) while dissociating the selective zones from the non-selective ones. It is based on the CFD techniques developed by Liu and Tilton (2010) and Liu (2012) that transport the moments of the fluid age distribution and consequently calculate the degree of mixing (Danckwerts, 1958; Zwietering, 1959). Then, this new model is integrated in a cyclic solver in order to perform Simulated Moving Bed (SMB) studies. The new model provides a detailed hydrodynamic description, which appears to be mandatory especially when mass transfer exchanges are fast, without undergoing the prohibitive simulation times of CFD models. Highlights: A 1D "multi-entrance multi-exit" model is developed to simulate adsorption processes. The model is more relevant than a Dispersive Plug Flow for fast mass transfer rates. It is successfully implemented in a cyclic Simulated Moving Bed Solver.