(213d) Novel CO2 Separation Process By Using Ionic Liquids

Novel
CO₂ separation process by Using Ionic Liquids

Haifeng Dong, Suojiang
Zhang*

Institute of Process
Engineering, Chinese Academy of Sciences, 100190, Beijing, China

*Corresponding
author: sjzhang@ipe.ac.cn

As a new solvent or medium, the unique structures and
properties of ionic liquids make them show significant advantages in the
reaction and separation fields. That offers new opportunities for new
technology development and the breakthrough of reaction conditions ^[1].
Previously, we have done some interesting work for
understanding the fundamental nature of ILs and developing new gas separation process.
New task-specific ILs for CO₂ separation were designed
and synthesized by modifying the structure of the anion and cation
of the ILs. The
CO₂ capture capacity of dual amino-functionalized ionic liquids is
up to 18.5 wt%, which is obviously higher than previously reported amino- functionalized
ILs ^[2]. Ionic-fragment method and
corresponding states principle were proposed to develop predictive models for thermodynamic
properties and phase equilibria of ILs system ^[3]. The effect of small amount of water on CO₂ bubble
behavior in ionic liquid was investigated. The results indicated that a small
amount of water has significant influence on the bubble behavior and mass-transfer
coefficient in ionic liquids ^[4].

Based on
simulated flue gas, continuous experiments were completed to evaluate the ionic
liquids performance in the laboratory by using gas separation unit (1.0Nm³/h).
Process simulation was also developed to optimize the CO₂ removal
performance using pure ILs and ILs mixture. The results showed that ILs process
saved about 31% regeneration heat energy consumption and 13.5% total capture
cost compared to the monoethanolamine process^[5]. Next
step, we hope to promote the engineering design and construction of
demonstration equipments by cooperating with company.

Reference:

[1]     
X. P. Zhang, X. C. Zhang, H. F. Dong, Z. J. Zhao, S. J.
Zhang, Y. Huang. Carbon capture with ionic liquids: overview and progress. Energy
Environ. Sci., 2012, 5, 6668

[2]     
J. Z. Zhang, C. Jia, H. F. Dong, J. Q. Wang, X. P. Zhang, S.
J. Zhang. A Novel Dual Amino- Functionalized Cation-Tethered Ionic Liquid for
CO₂ Capture. Ind. Eng. Chem. Res., 2013, 52(17),
5835

[3]     
Y. Huang, H. F. Dong, X. P. Zhang, C. S. Li, S. J. Zhang. A
new fragment contribution- corresponding states method for physicochemical
properties prediction of ionic liquids. AIChE J., 2013, 59(4), 1348

[4]     
X. Zhang, H.
F. Dong, D. Bao, Y. Huang, X. Zhang, S. J. Zhang. Effect of small amount of water
on CO₂ bubble behavior in ionic liquid systems. Ind. Eng. Chem. Res. 2014, 53, 428-439.

[5]     
Y. Huang, X. P. Zhang, H. F. Dong, X. Zhang, S. J. Zhang. Thermodynamic
Modeling and Assessment of Ionic Liquid-based CO₂ Capture
Processes, Ind. Eng. Chem. Res., 2014, 53 (29): 11805