Keywords-tetrabutylammonium bromide; SO2; viscosity I INTRODUCTIONSulfur dioxide(SO2) , a common greenhouse gas and sulfide, is harmful for human beings, causes to acid rain which corrodes construction, harms environment and affects the growth of plants and animals [1][2][3]. Flue gas desulfurization(FGD) used to treat SO2 emissions in industry of effective desulfurization. SO2 was gathered at low efficiency in this process, causing to secondary pollution, non-recyclable and other disadvantages. Ionic liquids as green solvents has no secondary pollution, can be recycled many times and has a high absorption efficiency. Because of these properties it has higher prospect of industrial application in terms of desulfurization.The preparation method of quaternary ammonium salt type of functional ionic liquid is simple and the materials are cheap. Asa solvent, it is almost no losses when recycled [4][5]. The research group founded that CPL-TBAB ionic liquid has stable nature, low melting point and absorbedhighly in SO2 in the early time. Further study founded TBAB aqueous solution has rather absorption rate to SO2 and appears stratified phenomenon after SO2 was absorbed in. A variety of physical properties are characterized to study the absorption mechanism of the TBAB aqueous solution. Viscosity, one of the most important physical properties of the material, internal friction and hydrogen bond are showed by the viscosity is bad for the process of dissolution and filtration. Besides, transmission efficiency and segregation rate are reduced by the viscosity. High viscosity brings about high energy consumption and causes problems to production in the chemical industry. The viscosity of imidazole ionic liquid decreases with temperature increasing [6][7] and more sensitive than density at the same temperature and concentration [8][9][10]. Guo[11] found the viscosity values of the binary mixtures of themethylbenzene and imidazole ionic liquid ([Bmim][BF4] and [Bmim][PF6]), decreased with the increase of temperature and the mole fraction of methylbenzene.In the manuscript, the viscosity of SO2 absorbed by TBAB aqueous solution was measured and correlated with Vogel-Fulcher-Tammann (VFT) equation.
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