Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (9): 1578.doi: 10.7503/cjcu20170117

• Organic Chemistry • Previous Articles     Next Articles

Synthesis of Dual-functionalized Ionic Liquid and Application in CO2 Absorption

SUN Liwei, LUO Jingyi, TANG Shaokun*()   

  1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Collaborative Innovation Center of Chemical Center of Chemical Science and Engineering(Tianjin), Tianjin University, Tianjin 300072, China
  • Received:2017-02-25 Online:2017-09-10 Published:2017-06-12
  • Contact: TANG Shaokun E-mail:shktang@tju.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21328601)

Abstract:

A new bifunctional ionic liquid was prepared, characterized and applied in the absorption and desorption of CO2. First, 1-methoxyethyl-3-methyl imidazolium glycinate([C3O1mim][Gly]) was synthesized by two-step method. The molecular structure was characterized and confirmed by 1H, 13C nuclear magnetic resonance(NMR) and Fourier transform infrared(FTIR) spectroscopy. And thermogravimetric(TG) analysis suggested that [C3O1mim][Gly] had good thermal stability. Then, compared to monoethanolamine(MEA), the CO2 absorption capacity of [C3O1mim][Gly] was studied in the range of 25—100 ℃ at normal pressure. By computation, the CO2 absorption capacity can reach 1.26 mol CO2/mol IL at 40 ℃, which is greatly higher than that of monoethanolamine(0.54 mol CO2 /mol MEA). And absorption capacity of CO2 in [C3O1mim][Gly] would decrease with the increase of temperature from 40 ℃ to 100 ℃. Furthermore, the ionic liquid exhibited excellent reversibility and CO2 absorption capacity can be maintained after 5 times of absorption-desorption circulation. Finally, the absorption kinetics of CO2 in [C3O1mim][Gly] was studied at 40 ℃. And Pseudo-second-order model is good to describe CO2 absorption in [C3O1mim][Gly].

Key words: Ionic liquid, Carbon dioxide, Absorption, Kinetic modeling

CLC Number: 

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