Studies On Sulfur Dioxide Absorption In Tri-ethylene Glycol + Dimethyl Sulfoxide System And Use For Preparation Of Sulfate Containing Barium

Combustion of coal and diesel fuels and inordinate increase of SO2 emission were major factors for air pollution,and SO2 has caused a series environmental problems associated with public health and human productive activity.Therefore,reducing the SO2 emission has attracted extensive attention and research work in all world.Organic chemicals absorption method was considered as a reliable and relatively competitive method for the mitigation of SO2 emission from fossil fuel power plants due to high removal efficiency and low cost,and it is very necessary to choose the solvent,including large absorb capacity,low cost,hypotoxicity,favorable regeneration properties and low degradation of solvents,which was choosed to absorb SO2 in our previous study.Considering the absorption capacity,viscosity,volatility,analytical results,economic costs and other factors,the binary system of tri-ethylene glycol(TEG)+ dimethyl Sulfoxide(DMSO)was used in SO2 absorption in this work as a potential application of desulfurizer.Solubility data were measured for the mixture SO2 + N2 in the system of TEG+ DMSO at T =(298.15,303.15,and 308.15)K and p = 123.15 kPa.Based on the solubility data,Henry's law constants(HLCs)and thermodynamical properties were obtained by fitting the linear slope of solubility data.The absorption mechanism was investigated by FTIR,UV-Vis,and 1H-NMR spectral analyse.The results indicated that the SO2 molecules could stably disperse in the solution,and it mainly result from a intermolecular interaction between the system of PGME + DMSO and SO2.The regeneration experimental results showed that the absorption of SO2 in the binary system was reversible,and the solvent could be reused without significant loss of absorption capacity.In addition,density and viscosity of the binary system of TEG + DMSO were measured to study the physical property of systems.The obtained values of VmE and ?? in the binary system of TEG + DMSO with a minimum at x1 ? 0.45 shows that the TEG molecule could interact with DMSO molecule through the most closely intermolecular binding when the molar ratio of TEG to DMSO was about 1: 1.In order to develop the reutilization of captured SO2 resources,the binary systems of TEG + DMSO system after absorbing SO2 were used to synthesize nano-micron Ba SO4 and BaSO3 by SO2 release method.Meanwhile,morphologies of the as-prepared BaSO4 or BaSO3 crystals could be successfully tuned with three major conditions,including Ba(OH)2 concentration,reaction temperature,and crystallization time.After the precipitation of BaSO3 crystals,the binary system of TEG + DMSO could not only be used to reabsorb SO2 but also to produce BaSO3 microspheres repeatedly with three times.In the process,the aggregation and self-assembly mechanism for the formation Ba SO4 or BaSO3 and DMSO's oxide chemistry of BaSO3 to BaSO4 were systemically put forward.Furthermore,Ba SO4 crystals with rectangle rod morphology and cubic BaSO3 crystal have been successfully prepared,and this synthesis offers the potential for inexpensive,feasible and environmentally friendly scale-up,which is expected to realize SO2 resource utilization by this method.