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SEPARATION SCIENCE AND TECHNOLOGY · 2019 · IF 1.354

Enhancement of CO2 capture in the MDEA solution by introducing TETA or TETA-AEP mixtures as an activator

Mei Wang,Na Rao,Yuqing Liu,Jiale Li,Qunpeng Cheng,Jianfen Li

TETA or TETA-AEP mixtures were used as an activator to enhance CO2 capture in the MDEA solution. The effect of amount and type of activators, and the viscosity of absorbents on CO2 capture were discussed. The results showed that the positive effect of TETA-AEP mixtures on CO2 capture in the MDEA solution was greater than that of TETA. The optimal absorbent was No. V, whose CO2 absorption capacity/desorption efficiency was 3.08 times/1.18 times of No. І. The viscosity had a little influence on CO2 absorption and an obvious effect on CO2 desorption.

CAS / MDL: 5308-25-8 105-59-9 112-24-3

研究领域: 化学工程 · 环境科学

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SEPARATION AND PURIFICATION TECHNOLOGY · 2022 · IF 9.136

Entropy enthalpy compensation in the SO2 absorption reaction and the optimal capture temperature range with amine alkyl siloxane as absorbent

Kai Wang,Guangzhen Li,Yanhong Li,Yuan Chen,Ling Zhang,Zhiying Zhu,Zhiyong Xu,Wenbo Zhao

In the present work, a kind of amine alkyl siloxane N -butyl-N-((1,1,3-trimethyl-3,3-diphenyldisiloxaneyl)methyl)butan-1-amine (BTDMBA) was synthesized and used to capture SO 2 . Its thermal decomposition temperature is 160℃, which is comparable with that of Ionic liquids (ILs), but its viscosity is only 125 mPa∙s at 25℃ after the absorption of SO 2 , which is much lower than that of ILs. The reaction mechanism is that BTDMBA reacted with SO 2 to form charge transfer complex BTDMBA∙SO 2 . The reaction enthalpy and entropy change are −83.95 kJ/mol and −240.48 J·mol −1 ·K −1 , respectively, which are more negative than that of ILs. By comparing the enthalpy and entropy change of amine alkyl siloxane and absorbents reported in literatures, an unexpected entropy enthalpy compensation phenomenon was discovered and the isokinetic temperature was found to be 371 K. Based on this phenomenon and the optimization objective function, it was also found that with the decrease of entropy change, the optimal absorption and desorption temperature difference increased initially and decreased afterwards. The maximum of entropy changes is −201 J·mol −1 ·K −1 for absorbent to achieve recycle absorption capacity 0.79 mol/mol under the condition of absorption pressure 0.002 bar and desorption pressure 1 bar.

研究领域: 物理化学 · 环境化学 · 分离科学 · 能源材料 · 工业气体净化 · 绿色化工

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Enhancement of CO2 capture in the MDEA solution by introducing TETA or TETA-AEP mixtures as an activator

Entropy enthalpy compensation in the SO2 absorption reaction and the optimal capture temperature range with amine alkyl siloxane as absorbent