摘要
以四甲基乙二胺(TMEDA)为分相剂,选用了乙醇胺(MEA)、羟乙基乙二胺(AEEA)、三乙烯四胺(TETA)和二乙烯三胺(DETA)四种常用于捕获CO_(2)的一级胺与TMEDA以1∶2的质量比复配,其中TMEDA与AEEA组成的吸收剂吸收一定量的CO_(2)后可以形成液液分相,且吸收CO_(2)效果最佳,饱和吸收负荷可达1.620molCO_(2)/kg。采用1,8-二氮杂双环[5.4.0]十一碳-7-烯-咪唑([DBU][Im])离子液体与TMEDA-AEEA液液两相吸收剂混合,研究[DBU][Im]离子液体对两相吸收剂吸收性能和液液分相的影响,通过碳谱核磁共振法对有机胺及CO_(2)产物的物质分布进行分析。结果表明,向TMEDA-AEEA两相吸收剂中引入[DBU][Im]离子液体有助于提高CO_(2)吸收负荷,[DBU][Im]离子液体、水和CO_(2)反应产物主要分布于下液相,上液相存在TMEDA和少量[DBU][Im]离子液体。当TMEDA、AEEA、水、[DBU][Im]离子液体的质量比为10∶4∶5∶1时,该吸收剂富液相吸收负荷相比TMEDA-AEEA两相吸收剂提高了49.6%。
In this study,tetramethylethylenediamine(TMEDA)was used as phase separating agent,four kinds of amines(ethanolamine,aminoethylethanolamine,triethylenetetramine and diethylenetriamine)that commonly used to capture CO_(2) were mixed with TMEDA in a mass ratio of 1∶2.The solvent composed of TMEDA and AEEA could form a liquid-liquid phase separation after absorbing CO_(2),and had the best CO_(2) absorption characteristics,with absorption loading capacity of 1.620molCO_(2)/kg.The mixture of 1,8-diazabicyclo[5.4.0]undecano-7-en-imidazole([DBU][Im])ionic liquid and TMEDA-AEEA biphasic solvent was used to study the influence of[DBU][Im]on the absorption and phase separation characteristics.The material distribution of organic amine and CO_(2) products in two phases were analyzed by 13C NMR spectrum.It was indicated the introduction of[DBU][Im]ionic liquids into TMEDA-AEEA biphasic solvent was helpful to increase the CO_(2) absorption loading capacity.The[DBU][Im]ionic liquids,water and CO_(2) reaction products were mainly distributed in the lower liquid phase,while TMEDA and a small amount of[DBU][Im]ionic liquids existed in the upper liquid phase.When the mass ratio of TMEDA,AEEA,water and[DBU][Im]ionic liquid was 10∶4∶5∶1,the absorption loading of the rich liquid phase of the absorbent was 49.6%higher than that of TMEDA-AEEA biphasic solvent.
作者
吕超
张习文
金理健
杨林军
LYU Chao;ZHANG Xiwen;JIN Lijian;YANG Linjun(Key Laboratory of Energy Heat Conversion and Process Measurement and Control of the Ministry of Education,Southeast University,Nanjing 210096,Jiangsu,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2023年第6期3226-3232,共7页
Chemical Industry and Engineering Progress
基金
内蒙古自治区科技重大专项(2021ZD0022)。
