Mass Transfer Test Essay

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EXPERIMENTAL
Mass transfer tests
The mass transfer tests in the test reactor (2 L Büchi autoclave) where conducted using an indirect (chemical) method. The experimental procedure (detailed in Section 6.1.3) consisted of filling the reactor with approximately 1.2 mol/L sodium sulfite solution containing 1-5 mg/L cobalt(II) ion, turning on the oxygen supply and starting the time. The oxidation reaction was allowed to continue for a predetermined time agitation was started and samples taken at regular time intervals. Each sample was mixed with excess standard iodine solution and titrated with standard sodium thiosulfate solution (Na2S2O3) using a starch indicator. The reactions are (Jeffrey et al., 1989): 〖"SO" 〗_"3" ^"2-" "+ " "I" _"2" "+ " "H" _"2" "O → " 〖"SO" 〗_"4" ^"2-" "+ " 〖"2H" 〗^"+" "+ " 〖"2I" 〗^"-" 6.1

〖"2S" 〗_"2" "O" _"3" ^"2-" "+ " "I" _"2" "→ " "S" _"4" "O" _"6" ^"2-" "+ " 〖"2I" 〗^"-" 6.2

The residual amount of sulphate was determined by the stoichiometry of the reaction 6.2. Detailed solution preparation and experimental procedure is given in Appendix III.
Reagents
All solutions where prepared with deionized water and grade A chemicals.
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Figure 6 1 presents a schematic diagram for the reactor while Figure 6 2 represents a picture of the experimental setup. The reactor is equipped with a stirrer drive with integrated high torque magnetic coupling to provide agitation. The agitation speeds were manually set and maintained throughout the course of experimentation. The reactor has an anchor type blade stirrer which was used for slurry agitation in all the tests conducted in this investigation. The pressure inside the reactor was monitored using a fitted pressure gauge. In order to obtain the desired pressure in the reactor vessel, the pressure of oxygen gas added to the reactor vessel was regulated by the pressure regulating valve fitted to the oxygen

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