乙酸钠法选择性脱除CO2中的SO2.pdfVIP

学兔兔 化 工 进 展 2012年第31卷第l0期 CHEMICAL INDUSTRY AND ENGINEER／NG PROGRESS ·2335· 乙酸钠法选择性脱除CO2中的SO2 王晓扬，陈绍云，张永春，陈 恒 (大连理工大学化工学院催化化学与工程系，辽宁 大连 I 16012) 摘 要：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SO，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。 关键词：保碳脱硫；乙酸钠；氧化；再生；吸收剂 中图分类号：X 701．3 文献标志码：A 文章编号：1000—6613(2012)10—2335—06 Selective desulfurization from CO2 via absorption by sodium acetate WANGXiaoyang，CHENShaoyun，ZHANG Yongchun，CHENHeng (Department ofCatalysis Chemistry and Engineering，School ofChemical Engineering，Dalian University of Technology，Dalian 116012，Liaoning，China) 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 wit}l gypsum as the by-product．Compared to sodium citrate，desulfurization by sodium acetate would significantly reduce the cost and side reactions．Tl1is study was divided into three steps：absorption， oxidation，and regeneration．Effects of different factors on desulfurization efnciency，oxidation rate， and regeneration were investigated under static condition．Results indicated that the absorption abiIity of the absorbent(0．08 mol／L)was inversely propotional to the temperature．The optimal conditions for