二乙二醇二甲醚对胺类少水吸收剂CO_(2)捕集性能及分相机理影响的研究  

Study on effect of diethylene glycol dimethyl ether on CO_(2)capture performance and phase separation mechanism of amine water-lean absorbent

作　　者：侯大伟 HOU Dawei(China Datang Corporation Science and Technology General Research Institute Co.,Ltd.,East China Electric Power Test&Research Institute,Hefei 230011,Anhui,China)

机构地区：[1]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,安徽合肥230011

出　　处：《低碳化学与化工》2025年第4期131-139,共9页Low-Carbon Chemistry and Chemical Engineering

基　　金：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)。

摘　　要：化学吸收法是重要的CO_(2)捕集技术,其中少水吸收剂因具有捕集速率较快、CO_(2)吸收负荷较高和再生能耗较低等优点而被广泛研究。以1,3-丙二胺(DAP)/四甲基乙二胺(TMEDA)/H_(2)O为基础的化学吸收剂具有良好的CO_(2)捕集性能,而利用物理溶剂替换部分H_(2)O所得胺类少水吸收剂可进一步降低再生能耗。在DAP/TEMEA/H_(2)O中加入二乙二醇二甲醚(DMEDEG),制得胺类少水吸收剂DAP/TEMEA/DMEDEG/H_(2)O。研究了m(DMEDEG):m(H_(2)O)对DAP/TEMEA/DMEDEG/H_(2)O CO_(2)吸收、解吸性能的影响,采用核磁共振技术和量子化学计算分析了DAP/TMEDA/DMEDEG/H_(2)O的反应和分相机理,并研究了DAP/TMEDA/DMEDEG/H_(2)O的腐蚀性和再生能耗。结果表明,将DAP/TMEDA/DMEDEG/H_(2)O中DAP+TMEDA质量分数固定为50%,当m(DMEDEG):m(H_(2)O)为1:9时,DAP/TMEDA/DMEDEG/H_(2)O具有最大CO_(2)循环负荷(3.549 mol/kg);DAP与CO_(2)反应主要生成氨基甲酸酯(DAPCOO-),并且中间产物(DAP+COO-)更容易使TMEDA质子化;一定条件下腐蚀20#碳钢试片7 d,DAP/TMEDA/DMEDEG/H_(2)O的缓蚀率为-1.035;相同条件下,DAP/TMEDA/DMEDEG/H_(2)O的再生能耗(4.13 GJ/t左右)略低于质量分数为30%的单乙醇胺的再生能耗(4.20 GJ/t左右)。Chemical absorption is an important CO_(2)capture technology,among which water-lean absorbent has been widely studied due to their advantages of fast capture rate,high CO_(2)absorption capacity and low regeneration energy consumption,etc.Chemical absorbent based on 1,3-diaminopropane(DAP)/tetramethylethylenediamine(TMEDA)/H_(2)O exhibits excellent CO_(2)capture performance,while the amine water-lean absorbent prepared by replacing part of H_(2)O with physical solvent can further reduce regeneration energy consumption.Amine water-lean absorbent DAP/TMEDA/DMEDEG/H_(2)O was prepared by the addition of diethylene glycol dimethyl ether(DMEDEG)to DAP/TMEDA/H_(2)O.Effect of m(DMEDEG):m(H_(2)O)on the CO_(2)absorption and desorption performance of DAP/TMEDA/DMEDEG/H_(2)O was investigated.Nuclear magnetic resonance(NMR)and quantum chemical calculation were used to analyze the reaction and phase-separation mechanisms of DAP/TMEDA/DMEDEG/H_(2)O.Additionally,the corrosiveness and regeneration energy consumption of DAP/TMEDA/DMEDEG/H_(2)O were studied.The results show that by fixing the DAP+TMEDA mass fraction in DAP/TMEDA/DMEDEG/H_(2)O at 50%,DAP/TMEDA/DMEDEG/H_(2)O exhibits the maximum CO_(2)cyclic load(3.549 mol/kg)with m(DMEDEG):m(H_(2)O)of 1:9.The reaction between DAP and CO_(2)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/H_(2)O is-1.035.Under certain conditions,the regeneration energy consumption of DAP/TMEDA/DMEDEG/H_(2)O(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 CO_(2)捕集 二乙二醇二甲醚 分相机理 再生能耗 

分 类 号：TQ413[化学工程]