(134d) Process Analysis of CO2 Capture with Ionic Liquid Solvent From Flue Gas

Process Analysis of CO₂ capture with
Ionic Liquid Solvent from Flue Gas

Y.
J. Chen ^a,b, Y. H. Yao^a,b, X. P. Zhang ^a,*,
S. J. Zhang^a, B. Z. Ren^a,

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

^b
School of
Chemical Engineering and Energy,
Zhengzhou University, 450001,
Zhengzhou, China

*Corresponding author: xpzhang@home.ipe.ac.cn
(X. P. Zhang)

Capturing CO₂ from the flue gas has been
considered as one of the effective and possible options to eliminate the global
warming effect now. As new solvents, ionic liquids have attracted great attentions
by the academies and industries on account of their low volatility, high
selectivity and high solubility. In this work,a rigorous simulation flow sheet including absorption and desorption
units, and taking ionic liquids compound as solvent has been established which
uses ELECNRTL as the global thermodynamic model, and the binary interaction parameters
between ionic liquids and the other components in the gas mixture are regressed
based on the experimental data (Zhao et al, 2010). Some key operation parameters,
such as solvent ratio and reflux ratio, were determined by sensitivity
analysis. The results showed that the new process could capture carbon dioxide from
the flue gas as high as 95%; the energy of reboiler was estimated to be reduced
more than 20% compared with the MEA method. Furthermore, a multi-objective
optimization was proposed and performed considering both the energy consumption
and environmental impact (green degree) of the new CO₂ capture process.

Acknowledgements

The authors sincerely appreciate the National Basic
Research Program of China (973Program) (No.2009CB219907).General Program Youth
of National Natural Science Foundation of China (Nos.20906096) for the
financial support.

References

Zhao, Y.
S., Zhang,X. P., Q., Dong, H. F, et al. (2010).Solubilities of gases in novel alcaminesionicliquid2-[2-hydroxyethyl(methyl)amino]
ethanolchloride. Fluid Phase Equilibria.,
302,60-64.