摘要
以胺改性多孔二氧化硅微球为主体单元,2-[2-(二甲基胺)乙氧基]乙醇(DMEE)为客体溶剂,制备球型硅基悬浮液状吸收剂,研究胺改性、客体溶剂、温度、转速、主体单元浓度对多孔球型硅基吸收剂CO2吸收性能的影响。结果表明,对于PEI、MEA和[N1111[Gly],PEI改性吸收剂最适合用于CO2捕集;DMEE作为客体溶剂对CO2既具有溶解作用,又能促进CO2与PEI-PSNs的反应;在其他条件不变时,吸收剂CO2吸收量随温度升高而逐渐降低;当ω(PEI-PSNs)=0.3时,PEI-PSNs/DMEE的CO2吸收量可达1.056 mmol·g^-1,同时发现拟二阶模型能较准确地描述PEI-PSNs/DMEE的CO2吸收动力学。此外,当解吸温度为80℃时,PEI-PSNs/DMEE经过5次循环后,再生效率仍然能达到92.0%,由此可见,其循环稳定性良好,节能潜力较大。
Based on porous amines-modified silica nanospheres as the hosts with dimethyaminoethoxyethanol(DMEE)as the object solvent,suspension liquids as CO2 absorbents were prepared.The effects of amine-functionalization,object solvent,absorption temperature,stirring rate and host concentrations on CO2 absorption were studied.It was found that the absorbent modified with PEI was most favorable for CO2 capture,comparing with the other absorbents modified with MEA and[N1111][Gly].DMEE as object solvent can not only absorb CO2 through physical dissolution,but also promote the reaction between PEI-PSNs and CO2.In addition,when other conditions remained the same,the absorption capacities of CO2 in absorbents decreased with the temperature increasing.It was also found that the highest CO2 absorption capacity of 1.056 mmol·g^-1 was obtained,when the concentration of PEI-PSNs wasω(PEI-PSNs)=0.3.And the pseudo-second order model can accurately predict the CO2 absorption kinetics of PEI-PSNs/DMEE.Besides,the regeneration efficiencies of PEI-PSNs/DMEE at 80℃were higher than 92%after five absorption-desorption circles,which showed an advantaged cycle stability and a great potential for energy conservation.
作者
李晓强
丁玉栋
郭李恒
朱恂
王宏
廖强
杨小强
LI Xiao-Qiang;DING Yu-Dong;GUO Li-Heng;ZHU Xun;WANG Hong;LIAO Qiang;YANG Xiao-Qiang(Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University),Ministry of Education.Chongqing 400030,China;Institute of Engineering Thermophysics,Chongqing University,Chongqing 400030,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第4期933-939,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51876013)
国家自然科学基金资助项目(No.51576022)
中央高校基本科研业务经费项目(No.2018CDXYDL0001)。
