乙二胺/二甲基亚砜复合吸收剂脱除SO_2的实验研究

Experimental study of SO_2 absorption with a mixture of ethylenediamine and dimethyl sulfoxide

以有机胺(乙二胺/二甲基亚砜)溶液作为吸收剂,磷酸作为pH调节剂,在带磁力搅拌的鼓泡吸收装置中,进行了模拟烟气脱硫的实验研究。以改善乙二胺吸收体系的再生性能为目标,考察了乙二胺和二甲基亚砜以不同体积复配组成的复合吸收剂的吸收和再生性能。结果表明:在总胺浓度相当的情况下,复配吸收剂的吸收容量随着吸收剂中乙二胺浓度的下降而减少;复配吸收剂的解吸率则随着乙二胺浓度的降低而增大;吸收剂的有效吸收容量则是先增大后减小。当乙二胺和二甲基亚砜比为3/2(体积比)时的吸收体系较优,SO2的首次解吸率从单一乙二胺吸收体系的35.5%提高到88.1%,有效吸收容量从6.81 g/L提高到12.3 g/L。

A novel flue gas desulfurization and gas desorption process, in which ethylenediamine and dimethyl sulfoxide were used as a mixed absorbent in a bubble reactor under magnetic stirring, is described. The pH value of the absorbent was adjusted by changing the proportion of phosphoric acid. Dimethyl sulfoxide was added in order to improve the regeneration capability of the aqueous ethylenediamine solution. The effects of varying the ratio of eth- ylenediamine to dimethyl sulfoxide on the absorption and desorption processes were studied. The results showed that over a certain concentration range, as the concentration of ethylenediamine decreased, the capacity of absorption and desulfurization efficiency both decreased and the effective absorption capacity had a maximum value. The optimal ethylenediamine ： dimethyl sulfoxide ratio was found to be 3 ： 2. By adding dimethyl sulfoxide in this proportion, the desorption efficiency increased significantly from 35.5% to 88.1% , and the effective absorption capacity in- creased from 6.81 g/L to 12.3 g/L.