DYNAMIC STUDY BEHAVIOR OF THE FLUIDIZED BINARY MIXTURE BED WITH BENTONITE PARTICLES
GABRIELA MUNTIANU(1), ILEANA-DENISA NISTOR(1*), ANA-MARIA GEORGESCU(1),
ANA-MARIA ROȘU(1), DIANA-CARMEN MIRILĂ(2, 3), ALINA MONICA MAREȘ(4),
COSMIN VALERIU JINESCU(5*)
1. ”Vasile Alecsandri” University of Bacau, Faculty of Engineering, Department of Chemical and Food Engineering, 157 Calea Marasesti Street, 600115, Bacau, Romania
2. “Vasile Alecsandri” University of Bacau, Faculty of Engineering, Applied Engineering Sciences Research Center, 157 Calea Marasesti Street, 600115 Bacau, Romania
3. ”Vasile Alecsandri” University of Bacau, Faculty of Science, Department of Biology, 157 Calea Marasesti Street, 600115, Bacau, Romania
4. National University of Science and Technology Politehnica Bucharest, Faculty of Applied Chemistry and Materials Science, Department of Chemical Engineering, 1-7 Gh. Polizu Street, District 1, 011061, Bucharest, Romania
5. Politehnica University of Bucharest, Department of Industrial Process Equipment, 313
Splaiul Independentei Street, 060042, Bucharest, Romania
*Corresponding authors: dnistor@ub.ro, cosmin.jinescu@yahoo.com
DOI:
https://doi.org/10.29081/ChIBA.2025.629
Abstract
This study presents experimental data on the behavior of gas-solid systems in classical fluidization of simple particles and binary mixtures. Sodium and calcium bentonite particles with different physical properties were used to determine dynamic parameters. The use of bentonite particles is often recommended because they are easy to manipulate and have high specific surface areas for gas-solid contact. The study examines the influence of average particle diameter ( ) and bed height (H0) on bed porosity (ε0), pressure drop (ΔP), and minimum fluidization velocity (Umf). Bentonite particles in a fluidized bed belong to Groups B and D according to Geldart's classification. The binary mixture particles have the same diameter but different densities and are pseudo-homogeneously mixed. The minimum fluidization velocity for well-mixed particles (Umf,mix) was determined for two mixtures with 0.57 mass fraction of sodium bentonite and bed ratios (H0/D) close to 2. Experimental values for minimum pressure drop (ΔPmin), minimum fluidization velocity (Umf), and minimum fluidization velocity for the mixture were compared with theoretical values using empirical equations. Regression analysis of all experimental data provided an empirical model for Umf and Umf,mix. The study aims to achieve better dynamic conditions for efficient and effective use of binary mixtures in future adsorption processes.