MDEA基相变吸收剂筛选及其CO_(2)捕集性能  

Selection of MDEA based phase change absorbers and carbon dioxide capture performance

作　　者：胡彦陇 王强[1] 胡定凯 张迎霜 陈亚丽[1] 陆诗建 HU Yanlong;WANG Qiang;HU Dingkai;ZHANG Yingshuang;CHEN Yali;LU Shijian(School of Chemical Engineering,Xinjiang University,Urumqi830017,China;School of Chemical Engineering,China University of Mining and Technology,Xuzhou221116,China)

机构地区：[1]新疆大学化工学院,新疆维吾尔自治区乌鲁木齐830017 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《洁净煤技术》2024年第6期158-170,共13页Clean Coal Technology

基　　金：新疆维吾尔自治区博士创新资助项目(XJ2023G039);新疆维吾尔自治区2022“揭榜挂帅”科技资助项目。

摘　　要：为了达到快速筛选相变吸收剂的目的,基于汉森溶解度参数理论,以N-甲基二乙醇胺(MDEA)为主吸收剂,有机溶剂为分相促进剂,水为溶剂,快速筛选出一种新型相变吸收剂——MDEA/聚乙二醇二甲醚(NHD)/H2O。热重分析(TGA)测试了相变吸收剂的热稳定性,CO_(2)吸收、解吸试验探究了相变吸收剂的CO_(2)吸收性能、解吸性能及循环再生能力。1 HNMR测试了相变前后物质的分布情况。结果表明,MDEA/NHD/H_(2)O相变吸收剂相比质量分数30%乙醇胺(MEA)吸收剂及文献已报道的MDEA/正丁醇/H_(2)O相变吸收剂具有最高的热稳定性。NHD作为分相促进剂的同时可促进CO_(2)在相变吸收剂中的溶解,MDEA/NHD/H_(2)O相变吸收剂发生液-液分相需要NHD和H_(2)O同时存在。25℃时,质量比为3∶5∶2的MDEA/NHD/H_(2)O相变吸收剂具有最高CO_(2)吸收容量为1.0695 mol/L。所开发的相变吸收剂可将送至解吸单元的解吸液体积降至42%。在解吸温度90℃时,CO_(2)解吸效率达98.96%。在25℃下吸收,90℃下热解吸,经10次吸收、解吸循环再生试验,质量比为3∶5∶2的MDEA/NHD/H_(2)O相变吸收剂的CO_(2)总循环容量为9.2604 mol/L,相比于质量分数30%MEA吸收剂、30%MDEA吸收剂及MDEA/正丁醇/H_(2)O相变吸收剂具有最高的CO_(2)循环能力。^(1)HNMR测试结果表明该相变吸收剂的上液相主要成分为NHD,为贫液相。下液相主要成分为MDEA和MDEAH^(+),为富液相。To achieve the purpose of rapid screening of phase change absorbent,a new phase change absorbent-MDEA/polyethylene glycol dimethyl ether(NHD)/H_(2)O was quickly screened with N-methyl diethanolamine(MDEA)as the main absorbent,organic solvent as the phase separation accelerator and water as the solvent,guided by the theory of Hansen solubility parameter.The thermal stability of the phase change absorbent was tested by thermogravimetric analysis(TGA),and the CO_(2)absorption and desorption performance of the phase change absorbent was investigated by CO_(2)absorption and desorption experiments,as well as the recycling ability.1HNMR was used to test the distribution of the substances before and after the phase change.The results show that MDEA/NHD/H_(2)O phase change absorb-ent has the highest thermal stability compared with 30%ethanolamine(MEA)absorbent and MDEA/n-butanol/H_(2)O phase change ab-sorbent reported in the literature.NHD as a phase separation accelerator can promote the dissolution of CO_(2)in the phase transition absorb-ent,MDEA/NHD/H_(2)O phase transition absorbent liquid-liquid phase separation requires the coexistence of NHD and H_(2)O.At the ab-sorption temperature of 25℃,the MDEA/NHD/H_(2)O phase change absorbent with a mass ratio of 3∶5∶2 has the highest CO_(2)absorp-tion capacity of 1.0695 mol/L.The phase change absorbent developed in this paper can reduce the volume of desorption liquid sent to the desorption unit to 42%.The CO_(2)desorption efficiency reached 98.96%at a desorption temperature of 90℃.The total CO_(2)cycling capaci-ty of MDEA/NHD/H_(2)O phase change absorbent with a mass ratio of 3∶5∶2 was 9.2604 mol/L after 10 cycles of absorption at 25℃and thermal desorption at 90℃.Compared with 30%MEA absorbent,30%MDEA absorbent and MDEA/n-butanol/H_(2)O phase change absorbent,it has the highest CO_(2)cycling capacity.The^(1)HNMR test results showed that the upper liquid phase of the phase change ab-sorbent was mainly composed of NHD,which was a CO_(2)-lean phase.The lower liq

关 键 词：相变吸收剂 CO_(2)吸收容量 汉森溶解度参数 CO_(2)循环容量 CO_(2)解吸效率 

分 类 号：TQ202[化学工程—有机化工]