Determining the Performance of an Efficient Nonaqueous CO2 Capture Process at Desorption Temperatures below 373 K

Yu, Y. S., Lu, H. F., Zhang, T. T., Zhang, Z. X., Wang, G. X. and Rudolph, V. (2013) Determining the Performance of an Efficient Nonaqueous CO2 Capture Process at Desorption Temperatures below 373 K. Industrial and Engineering Chemistry Research, 52 35: 12622-12634. doi:10.1021/ie400353f


Author Yu, Y. S.
Lu, H. F.
Zhang, T. T.
Zhang, Z. X.
Wang, G. X.
Rudolph, V.
Title Determining the Performance of an Efficient Nonaqueous CO2 Capture Process at Desorption Temperatures below 373 K
Journal name Industrial and Engineering Chemistry Research   Check publisher's open access policy
ISSN 0888-5885
1520-5045
Publication date 2013-09-01
Year available 2013
Sub-type Article (original research)
DOI 10.1021/ie400353f
Open Access Status
Volume 52
Issue 35
Start page 12622
End page 12634
Total pages 13
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
1500 Chemical Engineering
2209 Industrial and Manufacturing Engineering
Abstract Efficient CO capture by chemical absorption is currently gaining interests for the control greenhouse gas emissions. In this work, a nonaqueous process was developed to regenerate CO below 373 K by removing methanol first after the hybrid solvent of monoethanolamine (MEA) and methanol had absorbed CO. A model was accordingly developed to analyze the performance of the desorption process. Experiments were performed to determine the missing reaction kinetics of nonaqueous solvent regeneration of CO to help develop the model. The predicted gas concentration, axial velocity, energy consumption, and desorption efficiency agreed well with the stripper experimental data. A parametric analysis was conducted to investigate the effects of temperature, pressure, lean solvent loading, gas/liquid ratio, packing, and internals on the energy consumption and desorption efficiency. All analyses were performed under three defined desorption conditions: N , methanol vapor, and steam as purge gases. Major energy savings were clearly identified because of feasible desorption temperatures below 373 K under nonaqueous desorption conditions. N purge gas desorption conditions offered the minimum energy consumption of 2.28 GJ/t, being 24% below the typical value of 3.0 GJ/t. Additionally, it was found that the nonaqueous environment improved the desorption efficiency by 10% compared to that obtained by typical aqueous solution regeneration.
Formatted abstract
Efficient CO2 capture by chemical absorption is currently gaining interests for the control greenhouse gas emissions. In this work, a nonaqueous process was developed to regenerate CO2 below 373 K by removing methanol first after the hybrid solvent of monoethanolamine (MEA) and methanol had absorbed CO2. A model was accordingly developed to analyze the performance of the desorption process. Experiments were performed to determine the missing reaction kinetics of nonaqueous solvent regeneration of CO2 to help develop the model. The predicted gas concentration, axial velocity, energy consumption, and desorption efficiency agreed well with the stripper experimental data. A parametric analysis was conducted to investigate the effects of temperature, pressure, lean solvent loading, gas/liquid ratio, packing, and internals on the energy consumption and desorption efficiency. All analyses were performed under three defined desorption conditions: N2, methanol vapor, and steam as purge gases. Major energy savings were clearly identified because of feasible desorption temperatures below 373 K under nonaqueous desorption conditions. N2 purge gas desorption conditions offered the minimum energy consumption of 2.28 GJ/t, being 24% below the typical value of 3.0 GJ/t. Additionally, it was found that the nonaqueous environment improved the desorption efficiency by 10% compared to that obtained by typical aqueous solution regeneration.
Keyword Carbon Dioxide absorption
Chemical Absorption
Mass Transfer
Hemispherical Contactor
Solvent Regeneration
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 51276141
20936004
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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