摘要
近几年来,以氢键受体(HBA)和氢键供体(HBD)组成的低共熔溶剂(DESs)以其类似于离子液体的性质被认为是一种有潜力的SO2吸附剂。为制备用于低压SO2吸收的容量大、价格合理、循环性能好的低共熔溶剂,选用咪唑(Im)作为功能化组分,以价格低廉的甘油(Gly)、PEG200和乙二醇(EG)作为第二HBD,与作为HBA的氯化胆碱(CC)构建CC-GIy-Im、CC-PEG200-Im、CC-EG-Im三元功能化低共熔溶剂,并用于低压SO2的捕集实验研究。着重考察了第二HBD种类、咪唑含量、温度等因素对DESs吸收SO2的性能影响。结果表明:在所选的第二HBD中,PEG200的性能最佳,其构建的低共熔溶剂密度、黏度适中,热稳定性好,吸收性好;CC-PEG200-Im(1∶2∶7)在40℃下,对1%SO2的吸收量达到0.236 g SO2/g DES;经5次吸收-解吸循环后,低共熔溶剂吸收性能仍然稳定;1H NMR谱图分析结果表明,CC-PEG200-Im对SO2的吸收机理为化学吸收。
In recent years,DESs,which is composed of hydrogen bond acceptor(HBA)and hydrogen bond donor(HBD),is considered as a potential SO2 adsorbent due to its properties similar to ionic liquids.To prepare the DESs with large absorption capacity for low pressure SO2,reasonable price and good recycling performance,three ternary functionalized DESs of CC-Gly-Im,CC-PEG200-Im,CC-EG-Im were developed using choline chloride(CC)as HBA,imidazole(Im)as functional component,and cheap glycerol(Gly),PEG200,ethylene glycol(EG)as second HBD.The obtained DESs were further applied for experimental study for low pressure SO2,focusing on the type of second HBD,the content of imidazole,and temperature on the absorption performance of SO2.The results showed that PEG200 demonstrated the best property,and its DESs possessed moderate density and viscosity,satisfactory thermal stability and absorption capacity.The maximum absorption of CC-PEG200-Im(1∶2∶7)DESs for 1%SO2 at 40℃reached 0.236 g SO2/g DES.The DESs presented stable absorption performance for SO2 after five absorptiondesorption cycles.The CC-PEG200-Im could absorb SO2 by chemical interactions at the experimental conditions under 1H NMR spectrum investigation.
作者
邓晓霞
龚磊
刘小棒
邓东顺
DENG Xiaoxia;GONG Lei;LIU Xiaobang;DENG Dongshun(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第1期368-375,共8页
CIESC Journal
基金
浙江省自然科学基金项目(LY17B060010Y410069)
国家自然科学基金项目(21978263)
关键词
二氧化硫
低共熔溶剂
吸收
功能化
sulfur dioxide
deep eutectic solvent
absorption
functionalized
