乙酸钠法选择性脱除CO2中的SO2

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0.08 mol/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 CO_2 via absorption by sodium acetate

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.