二氧化碳(CO2)捕集工程应用的吸收剂存在再生能耗高、传质速率低、运行损耗大等问题,严重制约了 CO2捕集技术的大规模推广应用.为解决这些问题,该文开发适用于低分压CO2捕集的相变吸收剂.该相变吸收体系以亲水性胺N-氨乙基哌嗪(N-aminoethyl piperazine,AEP)为主吸收体系,添加亲脂性分相剂二正丁胺(Di-n-butylamine,DPA)和活化剂(activator,ACT).通过核磁共振波谱(nuclear magnetic resonance,NMR)和捕集CO2连续测试实验研究该相变吸收剂的性能.实验结果表明,吸收负载达1.082mol CO2/mol溶液,再生温度降至98.5℃,具有优异的吸收性能和解吸性能.NMR分析表明,反应产物具有氨基甲酸盐分子结构,捕集CO2连续测试实验研究与同浓度3mol/L 一乙醇胺(Monoethanolamine,MEA)溶液进行对比分析可知,相同再生能耗下,单位体积同浓度相变体系相比MEA吸收容量提高33％以上;相同再生能耗下相变体系的再生率比MEA提高15％,相同再生率下相变体系的再生能耗比MEA降低31％以上.结果表明,该相变吸收剂对于低分压CO2捕集具有良好的应用前景.
Development of CO2 Capture Phase Change Absorption System With Self Extraction
At present,there are some problems in the application of CO2 capture engineering,such as high regeneration energy consumption,low mass transfer rate and large operation loss,which seriously restricts the large-scale popularization and application of CO2 capture technology.To address these issues,phase change absorbers suitable for low partial pressure CO2 capture are developed in this paper.The phase change absorption system is mainly composed of hydrophilic amine N-aminoethyl piperazine(AEP),with lipophilic phase separation agent Di-n-butylamine(DPA)and activator.The results showed that the absorption load is 1.082 mol CO2/mol solution,and the regeneration temperature is reduced to 98.5℃.It has excellent absorption and desorption properties.NMR analysis shows that the reaction products have a carbamate molecular structure.Experimental studies of continuous testing of CO2 capture show that compared with the same concentration of 3 mol/L Monoethanolamine(MEA)solution,the absorption capacity of MEA in unit volume and concentration phase change system is increased by more than 33％under the same regeneration energy consumption;the regeneration rate of phase change system is increased by 15％compared with MEA under the same regeneration energy consumption,and the regeneration energyconsumption of phase change system which is decreased by more than 31％under the same regeneration rate.These results indicate that this phase change absorber has good application prospects for CO2 capture.
CO2 capturehydrophilic aminelipophilic amineregeneration energy consumptionself-extractionphase change system
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