尿素反应耦合萃取分离处理乙炔清净工艺废硫酸的研究

发布时间：2018-05-11 04:09

本文选题：废硫酸 + 反应耦合萃取法　；参考：《应用化工》2017年12期

【摘要】：乙炔清净工艺产生的废硫酸酸度高且含有较多的有机杂质,有机杂质与硫酸分子能够形成强的相互作用处理困难。采用反应耦合萃取分离方法,利用尿素与硫酸分子形成硫酸脲,消除有机杂质与硫酸分子之间的作用力,同时耦合溶剂萃取可对反应后释放的有机杂质进行分离去除。研究了二氯甲烷/废硫酸体积比、反应时间、尿素/H_2SO_4摩尔比以及H_2SO_4浓度对废硫酸中有机碳去除率的影响。结果表明,二氯甲烷/废硫酸体积比和反应时间影响了有机杂质向萃取相的传质过程,尿素/H_2SO_4摩尔比和H_2SO_4浓度则对有机杂质的释放具有重要影响。较优的工艺条件为:二氯甲烷/废硫酸体积比3∶1,反应时间1.5 h;尿素/H_2SO_4摩尔比1.5∶1,H_2SO_4浓度64.56%。此时的有机碳去除率达到95.21%。
[Abstract]:The waste sulfuric acid produced by acetylene purification process has high acidity and contains more organic impurities, so it is difficult to deal with the strong interaction between organic impurities and sulfuric acid molecules. Urea sulfate was formed by using urea and sulfuric acid molecule to eliminate the interaction force between organic impurities and sulfuric acid molecules. Coupling solvent extraction could separate and remove organic impurities released after reaction. The effects of the volume ratio of dichloromethane / waste sulfuric acid, the reaction time, the mole ratio of urea / H _ s _ 2SO _ 4 and the concentration of H_2SO_4 on the removal rate of organic carbon from waste sulfuric acid were studied. The results show that the volume ratio of dichloromethane / waste sulfuric acid and reaction time affect the mass transfer from organic impurities to extraction phase, while the mole ratio of urea / H _ 2SO _ 4 and the concentration of H_2SO_4 have important effects on the release of organic impurities. The optimum technological conditions are as follows: volume ratio of dichloromethane / waste sulfuric acid is 3: 1, reaction time is 1.5 h, and the molar ratio of urea / H _ 2SO _ 4 is 1.5: 1 ~ (-1) / H _ 2SO _ 4 concentration 64.56. The removal rate of organic carbon reached 95.21%.
【作者单位】：四川大学化学工程学院四川省多相流传质与反应工程重点实验室;四川天华富邦化工有限责任公司;
【基金】：国家自然科学基金项目(21576168) 四川省科技支撑计划项目(2014GZ0058) 川大-泸州战略合作项目(2014CDLZ-G29)
【分类号】：TQ028.32;X78

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