- Title
- Potassium sarcosinate promoted aqueous ammonia solution for post-combustion capture of CO₂
- Creator
- Yang, Nan; Xu, Don Yao; Yu, Hai; Conway, William; Maeder, Marcel; Feron, Paul
- Relation
- Greenhouse Gases: Science and Technology Vol. 4, Issue 4, p. 555-567
- Publisher Link
- http://dx.doi.org/10.1002/ghg.1426
- Publisher
- John Wiley & Sons
- Resource Type
- journal article
- Date
- 2014
- Description
- Aqueous ammonia (NH₃) is regarded as one of the most cost-effective solvents for carbon dioxide (CO₂) separation processes but suffers from low CO₂ absorption rates and high NH₃ vapor losses which hinder industrial application of this solvent in CO₂ capture from the flue gas of the coal-fired power sectors. In an attempt to address these issues, the effect of adding of potassium sarcosinate (K-SAR) to NH₃ solutions as a rate promoter on CO₂ mass transfer and NH₃ vapor loss in the aqueous NH₃-based post-combustion capture process was investigated in this work. Overall mass transfer coefficients (KG) describing CO₂ absorption and NH₃ vapor loss in 3.0M NH₃ and blended 3.0M NH₃ solutions containing a wide range of K-SAR concentrations from 0.0 to 3.0M were determined using a wetted-wall column contactor at 15–25 °C and CO₂ loadings from 0.0 to 0.5(molCO₂/mol total amine). Additionally, prediction of equilibrium species distribution using fundamental chemical modelling software (ReactLab) in CO₂-loaded NH₃ containing blended solutions were used to explain our experimental results. Addition of K-SAR resulted in significant improvement of KG of CO₂ absorption in NH₃ solutions, but also increased NH₃ vapor losses. The effect of temperature on KG of CO₂ absorption in K-SAR solution was greater than in the NH₃/K-SAR blended solution. The improvement in mass transfer upon addition of K-SAR is due to the faster reaction of CO₂ with K-SAR than with NH₃. The greater loss of NH₃ upon addition of K-SAR can be ascribed to the availability of more free NH₃ and the decrease of solubility of CO₂ and NH₃ in the NH₃/K-SAR blended solution. The investigation of KG of CO₂ and NH₃ vapor losses in NH₃ and other amines (PZ, 1-MPZ, DEA and MEA) blended solutions also proved the competition for CO₂ is one of the reasons for the increasing of NH₃ vapor losses.
- Subject
- aqueous ammonia (NH₃); NH₃ vapor losses; potassium sarcosinate (K-SAR); post-combustion CO₂ capture
- Identifier
- http://hdl.handle.net/1959.13/1302138
- Identifier
- uon:20414
- Identifier
- ISSN:2152-3878
- Language
- eng
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