Ion exchange technology in the sodium and ferric ion-dowex 50 systems
Department of Chemical Engineering
Master of Science
Keeffe, George C.
Salamone, Jerome J.
Kreps, Saul I.
Ion exchange resins
This investigation was directed toward the extension of data on the kinetics of monovalent - trivalent cation exchange and to establish data on the relationship between temperature and total capacity of an ion exchange resin. In order to compare the present study to a previous investigation by Klosowski (2), the capacity of the resin used for ferric and chromic ions was also measured.
In the kinetic study, the ferric ion-hydrogen ion exchange using Dowex 50 X-8 resin was studied in an agitated vessel. A two-bladed marine type propellor was used and the agitator speed was varied from 400 to 800 rpm. The exchange rates were measured for seven different particle size ranges from -16 mesh to +200 mesh.
The results of the kinetic study shows that within the range of variables
studied, the exchange rate is film diffusional controlled for this system.
The exchange rate varied directly with the agitator speed and inversely
with the particle size range. The equation proposed by Reichenberg (6)
for the calculation of film thickness gave results which agree with
the experimental data for particle sizes from -16 to +60 mesh but failed
for particle sizes below 70 mesh.
D = 0.0051 r/(Co) dØ/dt
D - Diffusion coefficient
This method would greatly simplify the determination of these coefficients
but would be subject to the assumptions given in the section on Calculations.
The principal assumptions are that the exchange process is film diffusional
controlled and that the process is carried out in dilute aqueous solutions
in view of possible viscosity changes.
In the capacity vs temperature phase of this investigation, the amount
of sodium ion hydrogen ion exchange was measured at temperatures from
0° to 100°C. using Dowex 50 X-8 and X-2 resin. The effect of
regeneration temperature was also tested.
njit-etd1958-002 (81 pages ~ 6,838 KB pdf)
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Created June 1, 2005