低碳化学与化工2025，Vol.50Issue(4)：131-139,9.DOI:10.12434/j.issn.2097-2547.20240343
二乙二醇二甲醚对胺类少水吸收剂CO2捕集性能及分相机理影响的研究
Study on effect of diethylene glycol dimethyl ether on CO2 capture performance and phase separation mechanism of amine water-lean absorbent
摘要
Abstract
Chemical absorption is an important CO2 capture technology,among which water-lean absorbent has been widely studied due to their advantages of fast capture rate,high CO2 absorption capacity and low regeneration energy consumption,etc.Chemical absorbent based on 1,3-diaminopropane(DAP)/tetramethylethylenediamine(TMEDA)/H2O exhibits excellent CO2 capture performance,while the amine water-lean absorbent prepared by replacing part of H2O with physical solvent can further reduce regeneration energy consumption.Amine water-lean absorbent DAP/TMEDA/DMEDEG/H2O was prepared by the addition of diethylene glycol dimethyl ether(DMEDEG)to DAP/TMEDA/H2O.Effect of m(DMEDEG)∶m(H2O)on the CO2 absorption and desorption performance of DAP/TMEDA/DMEDEG/H2O was investigated.Nuclear magnetic resonance(NMR)and quantum chemical calculation were used to analyze the reaction and phase-separation mechanisms of DAP/TMEDA/DMEDEG/H2O.Additionally,the corrosiveness and regeneration energy consumption of DAP/TMEDA/DMEDEG/H2O were studied.The results show that by fixing the DAP+TMEDA mass fraction in DAP/TMEDA/DMEDEG/H2O at 50％,DAP/TMEDA/DMEDEG/H2O exhibits the maximum CO2 cyclic load(3.549 mol/kg)with m(DMEDEG)∶m(H2O)of 1∶9.The reaction between DAP and CO2 mainly produces carbamate(DAPCOO-),and the intermediate product(DAP+COO-)facilitates the protonation of TMEDA.After 7 d of corrosion of 20# carbon steel sample under certain conditions,the corrosion rate of DAP/TMEDA/DMEDEG/H2O is-1.035.Under certain conditions,the regeneration energy consumption of DAP/TMEDA/DMEDEG/H2O(approximately 4.13 GJ/t)is slightly lower than the regeneration energy consumption(approximately 4.20 GJ/t)of monoethanolamine with mass fraction of 30％.关键词
胺类少水吸收剂/CO2捕集/二乙二醇二甲醚/分相机理/再生能耗Key words
water-lean amine absorbent/CO2 capture/diethylene glycol dimethyl ether/phase separation mechanism/regeneration energy分类
化学化工引用本文复制引用
侯大伟..二乙二醇二甲醚对胺类少水吸收剂CO2捕集性能及分相机理影响的研究[J].低碳化学与化工,2025,50(4):131-139,9.基金项目
中国大唐集团科学技术研究总院有限公司华东电力试验研究院研发项目(KY-2022-05). （KY-2022-05）
