| It's paticularly important to study an effective method of SO2 absorption for protecting environment and using sulfur dioxide resources to resolve the problem of sulfur resources shortage. The traditional desulfurization methods have their own shortcomings, the flue gas desulfurization(FDG) by using regenerative amine solution have some merits such as absorbing agent reusaging,not giving off waste matetial in system,economizing reclaimed sulfur dioxide, so it has widely practical perspective. At present, there is lack of research on desulfurization with mixed amines.The ethylenediamine as the aborbent and differents acids as the additives for desulfurization in the bubbling reactor have been investigated. The factors influencing absorption and desorption of sulfur dioxide (temperature, concentration of absorbent and SO2, the pH value of absorbent) were investigated by experiments and we got the optimum conditions. Further more, polyamine(diethylenetriamine, tritheylenetetramine),1-methyl-2-pyrrolidinone and dimethyl sulfoxide as space resistance amines were used to absorb sulfur dioxide with ethylenediamine. As compounded absorbent, the effects of the ratio of ethylene diamine to 1-methyl-2-pyrrolidinone and dimethyl sulfoxide on absorption and desorption were researched.The results showed that the optimum conditions in absorption process were fixed as following:concentration of ethylenediamine in absorbing solution is 0.3mol/L; temperature in absorption is 45℃-50℃; pH value is 7.00±0.10; and the optimum temperature in desorption is 100℃-106℃.The average efficiency of desulfurization was 96.9%and the desorption efficiency was 35.5%. In the compound system, the optional experimenral parameter were: the ratio of ethylenediamine to 1-methyl-2-pyrrolidinone was 3/2. The desorption efficiency sharply increased form 35.5% to 44.6%. The ratio of ethylene amine to dimethyl sulfoxide was 3/2 and the desorption efficiency sharply increased form 35.5% to 88.1%. |
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