Study On The Adsorption Properties Of Alcohol Amine Ionic Liquid

China is a big country with coal burning.The burning of coal brings a lot of pollutants,such as SO₂ and other polluting gases,which pose a serious threat to the ecological environment and human health.At the same time,as an important chemical raw material,the recovery of SO₂ is of great significance.Ionic liquid,as a green solvent,has significant advantages in gas adsorption.Alcoholamine ionic liquid,as a basic ionic liquid,has obvious advantages in desulfurization due to its low cost,easy availability,high desulfurization efficiency and easy desorption.However,its high viscosity limits its industrial application.On the basis of literature review,triethanolamine acetic acid ionic liquid（TAIL）was synthesized from triethanolamine and acetic acid as raw materials,and it was loaded onto silica gel to obtain supported particles（TAIL/SiO₂）to solve the problem of high viscosity.The adsorption/desorption performance of SO₂ by TAIL/SiO₂ under different factors was studied in a fixed-bed reactor,and the reaction kinetics involved was analyzed.The main research contents and conclusions are as follows:（1）The TAIL synthesized by microwave method is a yellow viscous liquid,which is weakly alkaline.The decomposition temperature is 120℃,and the viscosity decreases with the increase of the temperature.During the synthesis process,the N atom of triethanolamine can combine with the H ion in acetic acid to form the N-H bond.TAIL/SiO₂ particles were obtained by impregnation loading on the surface of silica gel,with an average loading efficiency of 84.65%.（2）The adsorption capacity of TAIL/SiO₂ for SO₂ is mainly reflected in the TAIL ionic liquid.Under the experimental conditions,the smaller the particle size of the carrier,the lower the reaction temperature,and the lower the water vapor content in the reaction atmosphere,the better the adsorption performance of SO₂ by TAIL/SiO₂,and the larger the sulfur capacity.When the load ratio is less than 0.74:1,the penetration time increases and the sulfur capacity increases with the increase of the load ratio,but when the load ratio is greater than 0.74:1,the penetration time and the sulfur capacity gradually decrease.The study on the kinetics of SO₂ adsorption by TAIL/SiO₂ shows that Bangham adsorption rate model can well predict the dynamic adsorption process of SO₂ on TAIL/SiO₂.（3）In the process of cyclic adsorption/desorption,the adsorption performance of SO₂ by TAIL/SiO₂ gradually weakens due to the loss of TAIL/SiO₂,but the decline rate slows down with the increase of the number of cycles.The loss of TAIL includes mass loss and incomplete loss of desorption.The mass loss in the initial process has a more obvious effect on the adsorption performance of SO₂.With the increase of the number of desorption times,the effect of incomplete loss on the adsorption performance of SO₂ gradually increases.With the increase of desorption times,the distribution trend of SO₂ precipitation curve is the same,but the maximum value is different.The higher the sulfur adsorption capacity of TAIL/SiO₂,the higher the maximum value of SO₂ concentration during desorption.After 6 cycles,strips of crystals began to appear on the surface of the supported particles,and with the increase of desorption times,the crystals gradually increased and agglomerated together to make the surface of the carrier more rough and uneven.The research results provide basic data and theoretical support for the removal of SO₂ from alcoholamine ionic liquids,and have important and practical value for promoting the application of supported ionic liquids for the removal of SO₂.