(24f) Simulation and Energy Assessment of Ammonia-Containing Gas Separation and Recovery Process with Ionic Liquids

Authors: 
Zhan, G., University of Chinese Academy of Sciences
Chang, F., Chinese Academy of Sciences
Zeng, S., Chinese Academy of Sciences
Li, Z., University of Chinese Academy of Science
Zhang, X., Beijing Key Laboratory of Ionic Liquids Clean Process,CAS Key Labroratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences

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normal"> font-family:" times new roman>Simulation and energy assessment of
ammonia-containing gas separation and recovery process with ionic liquids

" times new roman>Guoxiong normal"> line-height:150%;font-family:" times new roman> Zhan1,2,3,
Fei Chang1,2, Shaojuan Zeng1, Zengxi Li2, Xiangping
Zhang1,2*

font-family:" times new roman>1 " times new roman>Institute of Process Engineering, Chinese Academy of
Sciences, 100190, Beijing, China

font-family:" times new roman>2 " times new roman>School of Chemical Engineering, University of Chinese
Academy of Sciences, Beijing, 100049, China

font-family:" times new roman>3 " times new roman>Sino-Danish College, University of Chinese Academy of
Sciences, Beijing, 100049, China

font-family:" times new roman>*Corresponding author email:
xpzhang@ipe.ac.cn

normal"> font-family:" times new roman>Abstract: Huge
amounts of toxic gases (e.g. NH3) and greenhouse gases (e.g. CO2)
emission have caused serious environment problems. Besides, more strict laws
and standards have been proposed to reduce emissions and punish the action of
excess emissions in recent years. Therefore, NH3 and CO2
separation from industrial gas is considered as a significant and essential
technology to reduce atmospheric pollution. The traditional water method is used
to separate NH3 and CO2 from industrial gas, but it led
to a lot of ammonia-nitrogen wastewater, high energy consumption, low NH3/CO2
separation efficiency and NH3 recovery ratio. Therefore, there is
still a great challenge to get an effective way to separate and recover NH3
and CO2 from tail gas. Ionic liquids (ILs) has already been applied
in industrial tail separation due to extremely low volatility and good affinity
with gas molecule [1]. In this work, novel ILs with good selectivity
towards NH3/CO2 and high NH3 absorption
capacity were designed and synthesized. The thermodynamic data between NH3/CO2
and ILs were measured and regressed by the NRTL equation [2]. Based
on those results, the separation process of ammonia/carbon dioxide-containing
gas with ionic liquid has been simulated and optimized. The result indicates
that the designed IL can reduce NH3 concentration under 1000 ppm in
tail gas, and the removal efficiency and recovery purity are 70% and over 97%,
respectively. Then, based on the former results, the assessment of energy,
economy and green degree for separation system has been calculated to figure
out the integrated performance of the system under varied situations. The
results can provide guidelines for developing new absorption process to meet
lower NH3 concentration emission, higher NH3 purity and
recovery ratio along with lower energy consumption.

normal"> font-family:" times new roman>Keywords: Ionic
liquids; gas separation; NH3; CO2; process simulation;
energy assessment

REFERENCES

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Bai, X. C. Zhang, H. Wang, J. J. Wang, X. Y. Liu and S. J. Zhang, ChemRev, 2017.117.9626-9673 normal">

10.5pt;font-family:" times new roman>[2] X. Y. Liu, T. Zhou, X. P.
Zhang, S. J. Zhang, X. D. Liang, R. Gani, G. M. Kontogeorgis, Chem Eng Sci, 2018.192.816-828