氨基功能化离子液体复配PMDETA吸收剂的制备及其捕集CO_(2)实验

Preparation and CO_(2) capture experiment of amino-functionalized ionic liquid combined with PMDETA absorbent

以三乙烯四胺(TETA)和3-溴苯酚(3-Br-Ph OH)为原料,采用一步法合成氨基功能化离子液体三乙烯四胺-3-溴苯酚盐([TETAH][3-Br-Ph O]),并添加助溶剂五甲基二乙烯三胺(PMDETA)溶液以及去离子水组成水基CO_(2)吸收体系[TETAH][3-Br-Ph O]-PMDETA-H_2O用于CO_(2)吸收。采用核磁共振碳谱(13C NMR)、傅里叶变换红外光谱(FTIR)和热重分析(TGA)进行表征,分析所合成氨基功能化离子液体的结构、热稳定性以及体系吸收CO_(2)的反应机理。实验探究了反应温度、体系配比以及含水量对体系吸收CO_(2)性能的影响。结果表明,当[TETAH][3-Br-Ph O]与PMDETA的体积比为4∶6,去离子水含量为60vol%,吸收温度为25℃时,该体系的CO_(2)吸收容量达到最大值3.72 mol·L^(-1),远高于[TETAH][3-Br-Ph O]和PMDETA单独吸收CO_(2)的容量值。同时,在120℃加热解吸-再生90 min并经过5次循环吸收-解吸后,再生效率保持在87%,CO_(2)总吸收容量达到20.65 mol·L^(-1),具有良好的再生循环性能。该研究表明,氨基功能化离子液体复配溶剂对于CO_(2)捕集具有较大的应用潜力。

The amino-functionalized ionic liquids([TETAH][3-Br-PhO])was synthesized using a one-step method from triethylenetetramine(TETA)and 3-bromophenol(3-Br-PhOH).A water-based CO_(2) absorption system,[TETAH][3-Br-PhO]-PMDETA-H_(2)O,was created by mixing a PMDETA solution with deionized water as a co-solvent.Nuclear Magnetic Resonance Carbon Spectroscopy(13C NMR),Fourier Transform Infrared Spectroscopy(FTIR),and Thermogravimetric Analysis(TGA)were utilized to characterize the structure and thermal stability of the synthesized amino-functionalized ionic liquids.Furthermore,these techniques were used to investigate the reaction mechanism of CO_(2) absorption in the system.The effects of reaction temperature,system ratio,and water content on the absorption performance of CO_(2) were investigated.The results indicated that using a volume ratio of 4∶6 for[TETAH][3-Br-PhO]to PMDETA,a deionized water content of 60vol%,and an absorption temperature of 25℃,the CO_(2) absorption capacity of the system reached a maximum of 3.72 mol·L^(-1).It was significantly higher than the CO_(2) absorption capacity of[TETAH][3-Br-PhO]and PMDETA alone.After undergoing heating desorption-regeneration at 120℃ for 90 min and completing 5 cycles of absorption-desorption,the regeneration efficiency remained at 87%.Additionally,the total CO_(2) absorption capacity reached 20.65 mol·L^(-1),indicating excellent performance in the regeneration cycle.The research shows that the amino-functionalized ionic liquids mixed solvent has significant potential for capturing CO_(2).