https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33904 Wed 23 Jan 2019 10:40:10 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33575 Wed 21 Nov 2018 14:49:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19369 2 capture processes. Using software developed in Matlab and existing knowledge of chemical equilibria, investigations into the fundamental properties of formulated amine solvents and their interaction with CO₂ have been carried out. A simple solvent formulation containing equimolar amounts of monoethanolamine (MEA), Amine 1, and a sterically hindered /tertiary amine, Amine 2, has been investigated here. Specifically, the role of Amine 2 in the overall equilibrium behaviour of amine blends is discussed. Systematic variations of the protonation constants and reaction enthalpies of Amine 2 over a range of typical values has revealed that significant improvement can be made in terms of absorption capacity, cyclic capacity, and overall absorption enthalpy in the blends when compared to the standard 5.0 M MEA solvent.]]> Wed 11 Apr 2018 14:03:51 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33987 Wed 04 Sep 2019 12:16:28 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30096 3+ with SCN⁻ and which extrapolates to an initial spectrum at time zero, has been designed to overcome these difficulties and is described in this paper. Two complexes, Fe(SCN)²⁺ and Fe(SCN)₂⁺, have been identified upon analysing the absorbance data for thiocyanate concentrations up to 0.25 M at 25 °C and an ionic strength of 0.5 M. Equilibrium constants, K₁ = (98 ± 1)/M^-1 and K₂ = (7 ± 1)M^-1 have been determined and comparisons made with the literature.]]> Sat 24 Mar 2018 07:37:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27740 G) describing the absorption of CO₂ into aqueous PZ/NH₃ solutions were determined using a wetted-wall column apparatus at 25°C. The effect of added PZ (from 0 to 0.5M) on the mass transfer of CO₂ into 3.0M NH₃ solutions over a range of pre-loaded CO₂ concentrations of 0.9M at 25°C are reported in this work. The fast kinetic reactions of CO₂(aq) with blended solutions containing PZ/NH₃ were investigated using stopped-flow spectrophotometry at 25.0°C. Analysis of the kinetic measurements using a chemical model which incorporates the complete reaction sets of the individual amines with CO₂ (i.e., NH₃₋CO₂₋H₂O and PZ₋CO₂₋H₂O) resulted in good agreement with the experimental data. The contribution distribution from each reactive species was calculated based on the proposed reaction scheme of the PZ₋NH₃₋CO₂₋H₂O system. Results show that both the PZ/PZH⁺ and PZCO₂̅/PZCO₂H pathways make contributions to the promotion of CO₂ absorption into PZ promoted aqueous NH3 solutions. Importantly, the reactive piperazine mono-carbamate species, PZCO₂̅/PZCO₂H, which is present in the CO₂₋loaded mixtures of PZ/NH₃, plays an important role in the promotion of CO₂ absorption into CO₂₋loaded aqueous NH₃ solutions. The mass transfer simulation results reveal that there are additional reactions occurring in the gas-liquid interface and gas phase due to the volatility of NH₃, which requires further improvement on the simulation model.]]> Sat 24 Mar 2018 07:27:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36676 Mon 23 Aug 2021 12:41:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54747 Mon 11 Mar 2024 14:26:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42598 Fri 26 Aug 2022 12:17:41 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34246 Fri 22 Feb 2019 16:55:11 AEDT ]]>