新型AEP-相变吸收剂捕集CO_(2)研究

Study on novel AEP-based biphasic solvents for CO_(2) capture

CO_(2)引起的全球变暖日益显著。工业上普遍使用的CO_(2)捕集技术为一乙醇胺(MEA)化学吸收法,具有再生能耗高的缺点。为降低再生能耗,提出新型相变吸收剂——N-氨乙基哌嗪(AEP)/正丙醇水溶液,并研究其吸收性能、解吸性能及动力学特性。结果表明,AEP/正丙醇水溶液的吸收-解吸性能较好,吸收负荷为1.09~1.35 mol·mol^(-1),解吸负荷为0.93 mol·mol^(-1),远高于MEA水溶液;AEP/正丙醇水溶液的富相体积分数为56.5%~58.6%,富相产物质量分数为97.1%-99.0%,解吸时只需对富相进行加热,可有效降低再生能耗;且AEP/正丙醇水溶液与CO_(2)的反应为快速拟一级反应,有利于工业应用。

Global warming caused by CO_(2) is becoming a severe problem.A widely used technology for CO_(2) capture in industry is chemical absorption with monoethanolamine(MEA).However,the regeneration energy of MEA aqueous solution is high.In order to reduce regeneration energy,a novel biphasic solvent of 1-(2-aminoethyl)piperazine(AEP)/1-propanol aqueous solution was proposed.The absorption performance,desorption performance and kinetics were studied.The results show that the AEP/1-propanol aqueous solution has great absorption-desorption performance.The absorption loading was 1.09-1.35 mol·mol^(-1) and the desorption loading was 0.93 mol·mol^(-1),which are much higher than those of MEA aqueous solution.The volume ratio of the rich phase was 56.5%-58.6% and the loading ratio of the rich phase was 97.1%-99.0%.Therefore,only rich phase needs to be heated during desorption and the regeneration energy can be reduced.Kinetics study shows that the reaction between AEP/1-propanol aqueous solution and CO_(2) is a fast pseudo-first-order reaction,which is beneficial for industrial application.