关键词: 保碳脱硫, 乙酸钠, 氧化, 再生, 吸收剂

Abstract: 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.

Key words: carbon-keeping desulphurization, sodium acetate, oxidation, regeneration, absorbent