Hydroxyl ammonium ionic liquids synthesized by water-bath microwave: synthesis and desulfurization.
Hydroxyl ammonium ionic liquids synthesized by water-bath microwave: synthesis and desulfurization.
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DOI：
10.1016/j.jhazmat.2009.12.105
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发表时间：
2010-05
影响因子：
13.6
通讯作者：
Linzhi Zhai;Q. Zhong;Chuan He;Juan Wang
中科院分区：
文献类型：
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作者：
Linzhi Zhai;Q. Zhong;Chuan He;Juan Wang
采用水浴微波法合成羟基铵离子液体(ILS)，对烟气中二氧化硫(SO2)的脱除进行了研究。结果表明，水浴微波法具有反应时间短、产率高等优点。采用L9(34)正交实验设计，对乳酸乙醇胺ILS的合成进行了初步研究。统计分析表明，铵/酸的摩尔比是最重要的影响因素，最佳的制备条件为：在338K下，波功率为300W，反应时间为30min，摩尔比为1：1.1(乙醇胺与乳酸的摩尔比)。在相同条件下，除二甲基乙醇胺类离子液体外，其他离子液体的收率均在90%以上。结果表明，SO2在乳酸乙醇胺溶液中的溶解度为0.51(摩尔分数)，高于其它溶剂。乳酸乙醇胺ILS对SO2有较好的吸收效果。吸附和解吸的最佳温度分别为298K和363K。最佳解吸时间为60min。实验还发现，水浴微波可以促进离子液体中吸收的SO2的释放。
Water-bath microwave method was used for hydroxyl ammonium ionic liquids (ILs) synthesis to study the removal of sulfur dioxide (SO2) from the flue gas. The results showed that the water-bath microwave method has some advantages of short reaction time and good yields. The synthesis of ethanolamine lactate ILs was fundamentally studied by an orthogonal experiment design (L9(34)). Based on statistic analysis, it is revealed that the molar ratio of ammonium/acid is the most significant variable, and the optimized preparation conditions are under 338K, wave power of 300W for 30min with the molar ratio 1:1.1 (ethanolamine vs. lactic acid). At the same condition, the yield of the other ILs was over 90% except dimethyl ethanolamine-based ILs. Results showed that the solubility of SO2in ethanolamine lactate ILs was 0.51 (mole fraction), higher than others. Ethanolamine lactate ILs was a better absorbent for SO2. The optimal temperature for the absorption and desorption process were 298 and 363K, respectively. The optimal desorption time was 60min. It was also found that water-bath microwave can improve the release of the absorbed SO2from ILs.