醚对有机胺BHEP水溶液相变吸收 SO2 的影响
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文章编号：1003-9015（2025）02-0250-13
关键词：液液相变； N，N′ -双（2-羟乙基）哌嗪；醚类分相剂； SO2 ；再生能耗 中图分类号：X701 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.02.008
Abstract： In order to reduce the energy consumption in SO2capture by organic amine，a new phase change absorbent - N ， N′ - bis（2-hydroxyethyl） piperazine（BHEP）and ether aqueous solution was developed. The impacts of 12 types of ethers with diferent carbon chain lengths，atom number ratios of carbon to oxygen （C/O）and molecular structure on the phase change absorption of SO 2 were investigated. The results show that the carbon chain length of ether has little impact on phase separation. Higher C/O and logP values of ether and stronger hydrophobicity can resultineasierphaseseparation.Additionaly，thestructureof ethersignificantlyaffects itsdistribution intwophases.Theresults indicate that higher content of diethylene glycol monobutyl ether（DEGBE）leads to shorter phase transition time，smaller lower phase volume fraction and lesser distribution mass rates of DEGBEand H2O in lower phase.The distribution mass fractionsof SO2 ， H2 SO and BHEP are almost unaffected by DEGBE concentration.With the increase of DEGBE concentration，both theabsorption capacityanddesorption rate initially increase and then diminishes，the cyclic capacity is slightly reduced，and the energy consumption for regeneration first decreases and then increases.The regeneration energy consumption is reduced by 22.91%after the presence of 20% mass fraction of DEGBE. 13C NMR and 1H NMR indicate that there is a significant polarity difference between ether，amine，and amine salt in the solution，which is the mainreason for the liquid-liquid phase transition.The resultscan provide a reference for the development of drainage SO2 phase change absorber.
Key words： liquid-liquid phase transition； N，N′ -bis（2-hydroxyethyl） piperazine；ether-type phase separation agent； SO2 ；regeneration energy consumption
1前言
有机胺化学吸收法脱除废气中的 SO2 ，具有吸收反应速率快、吸收容量大、选择性好、副产物 SO2 纯度高等优点，目前已应用于化工、冶炼、化肥等行业的废气治理[1-2]。（剩余20577字）
