N-(2-羟乙基)哌嗪溶液吸收/解吸SO_2的性能研究

文章通过亚硫酸钠溶液研究SO32-浓度和添加不同阴离子对溶液中S(Ⅳ)氧化率的影响。通过静态法和加热法分别研究N-(2-羟乙基)哌嗪溶液吸收/解吸SO2的性能,并推测了N-(2-羟乙基)哌嗪溶液吸收/解吸SO2的机理。结果表明,SO32-浓度在0.08~1.0 mol/L范围内,随着SO32-浓度的增大,S(Ⅳ)氧化率明显降低,当SO32-浓度高于1.0 mol/L,S(Ⅳ)的氧化率降低程度减小;Cl-、SO42-、PO43-和SO32-离子均能够降低S(Ⅳ)的氧化率,且差别不大。选用50%的N-(2-羟乙基)哌嗪溶液吸收SO2,溶液中SO32-浓度高,可有效地抑制溶液中S(Ⅳ)的氧化,解吸率达80.5%,且实验结果与所推测的N-(2-羟乙基)哌嗪溶液吸收/解吸SO2机理相一致。

Study on the properties of absorption and desorption of SO_2 with the N-(2-hydroxyethyl)piperazine in aqueous solution

The effect of the concentration and additive anions on the oxidation ratio of S(Ⅳ)in Na_2SO_3 solution was researched by the change of the concentration of S(Ⅳ)in the solution.Absorption and desorption of SO_2 with the N-(2-hydroxyethyl)piperazine in aqueous solution were studied by the static state process and the heating method,respectively.And meanwhile the mechanism of absorption and desorption of SO_2 was presumed The results indicate that with the increase of the concentration of SO_3~(2-) from 0.08 mol/kg to 1.0 mol/kg,the oxidation ratio of S(Ⅳ)decreased obviously and the decreasing trend of oxidation ratio of S(Ⅳ)turned small.All of additive anions can restrain the oxidation of S(Ⅳ)and the difference of all kinds of anions was very small.50%N-(2-hydroxyethyl)piperazine in aqueous solution,which can effectively restrain the oxidation of S(Ⅳ),was chosen as the desuIfurizer to absorb SO_2.The desorption efficiency can reach 80.5%.In addition,the experimental data was consistent with the mechanism about the reactions presumed.