https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 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: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:23735 Sat 24 Mar 2018 07:16:57 AEDT ]]>