Influence of Ions on the Coalescence Behavior phoenix project - PowerPoint PPT Presentation

Influence of Ions on the Coalescence Behavior phoenix project Horizon 2020 David Leleu, Andreas Pfennig dleleu@uliege.be Products, Environment, and Processes (PEPs) Department of Chemical Engineering Université de Liège www.chemeng.uliege.be/Pfennig 1

change due to trace components 5 position in measuring cell 4 MIBK (d) + water (c), a = 5mm, f = 2 Hz, 3 V = 20 l/h, T = 20 °C coalescence disperser c NaCl, aq exp. sim. 2 mmol/l 0 25 1 75 0 1 2 3 4 Sauter mean diameter in mm 2

technical equipment 3

stirring cell 4

stirring-cell experiment 0.18 0.16 stirring cell height in m 0.14 0.12 0.10 settling time 0.08 sedimentation curve 0.06 0.04 coalescence curve 0.02 0.00 0 5 10 15 20 25 30 time in s 5

Coalescence model p coal = 1 − exp − t contact t coal d 1 + d 2 t contact ∝ v relative drops diameter dimple ∝ ቊ deformed drops dimension F buoyancy F turbulences F driving= F hydrostatic_pressure 6

Settling times with salts added 5 butanol+water, 10 organic/aqueous = 5/2 NaB r after Beusch 4 10 3 10 NaCl 2 10 1 10 -3 -2 -1 0 1 2 3 4 10 10 10 10 10 10 10 10 Butanol-Phase [mol/m 3 ] c 7

Salt influence on the coalescence 8

ions partitions: one single salt Cl - Cl - Na + Na + Cl - Cl - Na + Na + Na + Na + Na + Na + Cl - Cl - Cl - Cl - Cl - Na + Na + Cl - Na + Cl - Na + Na + Na + Cl - Cl - Cl - Na + Na + Cl - Cl - 9

Albertsson model z F     0 i ln K ln K i i RT 0 RT K    A ln    0 z z F K B A B 10

electrostatic potential measurement Cl - Cl - Na + dye Na + Cl - Cl - Na + Na + Na + Na + Na + Na + Cl - Cl - Cl - dye Cl - Cl - dye dye dye Na + Na + Cl - Na + Cl - Na + Na + dye Na + Cl - Cl - Cl - Na + Na + Cl - Cl - 11

Albertsson model System I System II Cl - dye Cl - Cl - Cl - Cl - Cl - + + NH 4 NH 4 + Na + NH 4 dye dye + Cl - + Na + NH 4 NH 4 Cl - Na + + NH 4 Na + Cl - dye dye Cl - Cl - dye Na + Cl - Na + + NH 4 Na + Cl - Cl - Na + Cl - Cl - I K RT     dye ln II z F K dye dye 12

experimental data: partition coefficient T = 298.15 K NH 4 Cl NaCl K dye MgSO 4 1 NaNO 3 0.001 0.01 0.1 1 10 100 C cation in mmol/kg 13

salt influence on the settling behavior 160 T = 298.15 K 140 o/w: 1/2 120 o/w: 2/1 100 MgSO 4 settling time in s 80 NaNO 3 60 NaCl NH 4 Cl 40 -40 -30 -20 -10 0 10  in mV 14

Influence of Ions on the Coalescence Behavior phoenix project Horizon 2020 David Leleu, Andreas Pfennig dleleu@uliege.be Products, Environment, and Processes (PEPs) Department of Chemical Engineering Université de Liège www.chemeng.uliege.be/Pfennig 15