https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:16483 Wed 11 Apr 2018 14:14:59 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44061 KL,SO2>KL,CO2. The fluxes of SO2 predicted from three methods were further compared with the experimental values measured in SO2-NaOH system. The fluxes predicted from KL,SO2 agreed well with the experimental values, whereas those from KL,CO2 and KL,O2 were significantly lower or higher. Therefore, the liquid-phase mass transfer coefficient is preferably obtained from the targeted gas. Modelling on the flux of SO2 demonstrates the transition of controlling regions against pH. At pH above 4, the gas side resistance is larger than the liquid side, whereas at pH below 4, the gas side resistance is smaller than the liquid side.]]> Thu 06 Oct 2022 10:19:26 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17446 Sat 24 Mar 2018 08:04:02 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26964 5.5. The concentration of HCO₃⁻ increases dramatically above pH 6 and below this pH, the concentration of HCO₃⁻ is negligible. The absorption rate of SO₂ was found to increase with pH with some increase with the concentration of SO₂. The operational pH window for scrubbing may be defined by an upper limit pH where the absorption rate of SO₂ starts to decreases from the maximum absorption rate of SO₂ and the lower limit pH where the absorption rate of SO₂ reduces to half of the maximum absorption rate of SO₂. Both the upper limit and the lower limit decrease initially and stay stable with the concentration of SO₂. This decrease is caused by the reversible reaction of the hydrolysis of SO₂ and confirmed by equilibrium experiments of SO₂ and sodium solutions. Operation within region 2 (pH 5-6) is recommended, depending on the scrubber design. The operation exit pH of the produced liquid can be varied within the region. The absorption rates of SO₂ obtained in the steady state experiments were predicted by a model based on the instantaneous reaction assumption. This model generally overestimates the absorption rates of SO₂ at pH values below 6 indicating a kinetic limitation of SO₂ and water reaction at low pH values. The analysis on the controlling regions indicates that the gas side mass transfer resistance decreases with the concentration of SO₂. Liquid side resistance becomes more important at a lower pH and a higher concentration of SO₂.]]> Sat 24 Mar 2018 07:27:02 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26963 Sat 24 Mar 2018 07:27:02 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26570 Sat 24 Mar 2018 07:26:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26572 Sat 24 Mar 2018 07:26:10 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23255 Sat 24 Mar 2018 07:17:00 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23735 Sat 24 Mar 2018 07:16:57 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22821 5.48. The oxidation rate of S(IV) drops by 44.5% at pH < 5.48. For the homogeneous oxidation, there are three regions of oxidation rate. In region 1 (i.e., pH > 5.6), the oxidation rate of S(IV) does not change with pH; in region 2 (i.e., 4.53 < pH < 5.6), the oxidation rate of S(IV) decreases dramatically with the decrease in pH. The oxidation rate of S(IV) at pH 4.53 is two magnitudes lower than the rate at the pH 5.6. In region 3 (i.e., pH < 4.53), the oxidation rate of S(IV) does not seem to change. The oxidation of S(IV) is presumably due to the oxidation of SO₃²⁻. Results have implications on the disposal of waste sodium solutions after absorption. The oxidation of S(IV) in discharged solutions results in a final pH of about 4 which may be neutralized to form Na₂SO₃ prior to disposal.]]> Sat 24 Mar 2018 07:16:10 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42821 Mon 05 Sep 2022 11:49:20 AEST ]]>