考察了用乙酸钠溶液选择性吸收二氧化碳中的二氧化硫,用碳酸钙再生使乙酸钠循环使用,并得到副产物石膏。该方法与已有的柠檬酸钠法相比,成本低,再生副反应少。实验主要分为吸收、氧化、再生三个步骤,静态分别考察不同因素对吸收率,氧化率以及再生过程的影响。结果表明：吸收过程中乙酸钠溶液的浓度为0.08mol/L时,对SO2的吸收效果较好,且低温更有利于吸收。氧化过程最佳条件为：催化剂硫酸锰浓度为0.03 mol/L,温度90℃,转速400 r/min,空气流量150 mL/min,pH=4.0。再生时控制碳酸钙加入量在0.7 g左右,且反应在90℃进行,有利于生成硫酸钙;再生5次,再生液吸收的穿透时间基本不变,饱和吸收量略有减小。%Selective desulfurization from carbon dioxide was investigated by absorption method using sodium acetate solution as the sbsorbent.The absorbent was regenerated by calcium carbonate with gypsum as the by-product.Compared to sodium citrate,desulfurization by sodium acetate would significantly reduce the cost and side reactions.This study was divided into three steps:absorption,oxidation,and regeneration.Effects of different factors on desulfurization efficiency,oxidation rate,and regeneration were investigated under static condition.Results indicated that the absorption ability of the absorbent(0.08 mol/L) was inversely propotional to the temperature.The optimal conditions for oxidation are as follows:catalyst of manganese sulfate 0.03 mol/L,rotational speed 400 r/min,airflow rate 150 mL/min,pH=4.0 and temperature 90 ℃.For the regeneration process,around 0.7 g calcium carbonate should be added to the absorbent and reacted at 90 ℃.After 5 times’ regeneartion,the breakthrough time of the regenerated absorbent was almost the same as fresh one;but the saturated absorption capacity decreased.
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