三乙二醇二甲醚吸收低浓度SO2性能及机理研究  

Study on performance and mechanism of triethylene glycol dimethyl ether for capturing low concentration SO2

作　　者：杨小青 廖泉飞 易芸[1,2] 杨春亮 赵天翔[1,2] 胡兴邦 刘飞 YANG Xiaoqing;LIAO Quanfei;YI Yun;YANG Chunliang;ZHAO Tianxiang;HU Xingbang;LIU Fei(School of Chemistry and Chemical Engineering,Guizhou University,Guiyang 550025,Guizhou,China;Key Laboratory of Green Chemical and Clean Energy Technology,Guiyang 550025,Guizhou,China;School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,Jiangsu,China)

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025 [2]绿色化工与清洁能源技术重点实验室,贵州贵阳550025 [3]南京大学化学化工学院,江苏南京210023

出　　处：《化工学报》2020年第11期5052-5058,共7页CIESC Journal

基　　金：贵州大学自然科学专项基金项目(X2019065);贵州省科技创新人才团队项目(黔科合平台人才[2018]5607)。

摘　　要：多羟基醇如丙三醇、乙二醇、聚乙二醇等富含氢键位点,通过氢键相互作用能循环捕集SO2气体。然而,羟基比例更高的丙三醇和乙二醇对SO2的吸收能力远弱于聚乙二醇,这表明除氢键作用之外,可能还存在SO2与醚氧原子间的电荷转移作用。为了证实SO2与醚氧原子间的电荷转移作用,实验选择沸点较高的三乙二醇二甲醚作为SO2的吸收剂。首先采用气体动态单循环法测定了低浓度SO2(体积分数为2010×10-6)在122.7kPa和293.15~313.15K下的汽液相平衡数据,并且基于汽液平衡数据,计算了SO2吸收过程的热力学参数,包括亨利常数、熵变、焓变和Gibbs自由能等。此外,基于紫外光谱、红外光谱和核磁波谱的实验结果,证实了SO2和三乙二醇二甲醚之间的O…S电荷转移相互作用。Polyhydric alcohols such as glycerol,ethylene glycol,polyethylene glycol,etc.,are rich in hydrogen bonded sites and can trap SO2 gas cyclically through hydrogen bond interactions.Although both glycerol and ethylene glycol have more hydroxyl groups than polyethylene glycol,the absorption capacity of SO2 is lower than that of polyethylene glycol,which indicates that in addition to the hydrogen bonding effect,there may be a charge transfer effect between SO2 and ether oxygen atoms of polyethylene glycol.Herein,to clarify the charge transfer effect between SO2 and ether oxygen atoms,triethylene glycol dimethyl ether with a higher boiling point was selected as SO2 absorbent.First,the gas-liquid equilibrium data of diluted SO2(2010×10-6)at 122.7 kPa and 293.15 to 313.15 K were measured by a gas dynamic single cycle method.Then the thermodynamic parameters of the absorption process were calculated based on the SO2 solubility data,including Henry􀆳s constant,entropy change,enthalpy change and Gibbs free energy.In addition,the O…S charge transfer interaction between SO2 and triethylene glycol dimethyl ether was confirmed by using UV-Vis,FTIR and NMR spectroscopy.

关 键 词：二氧化硫 三乙二醇二甲醚 吸收 汽液平衡 热力学 机理研究 

分 类 号：TQ028.8[化学工程]