- Title
- Effect of sarcosinate on the absorption kinetics of CO₂ into aqueous ammonia solution
- Creator
- Xiang, Qunyang; Fang, Mengxiang; Maeder, Marcel; Yu, Hai
- Relation
- Industrial & Engineering Chemistry Research Vol. 52, Issue 19, p. 6382-6389
- Publisher Link
- http://dx.doi.org/10.1021/ie4006063
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2013
- Description
- Promoted aqueous ammonia is a potential solvent for CO₂ separation processes. In this work, we investigated the effect of temperature, sarcosinate concentration, and CO₂ loading on the mass transfer coefficients of CO₂ absorption in a sarcosinate-promoted aqueous ammonia solution on a wetted-wall column. We further investigated the kinetics of the reaction between CO₂ and a blended NH₃/sarcosinate absorbent using stopped-flow spectrophotometric techniques, following the pH changes via coupling to pH indicators. Our study revealed that the mass transfer coefficient for CO₂ absorption in a 3 M ammonia + 1.5 M sarcosinate blended solution at 288 K is close to that in 5 M monoethanolamine absorbent at 313 K. We did not observe any synergistic or catalytic effects between NH₃ and sarcosinate in the blended solution; the mechanism of the reaction of CO₂ with the NH3/sarcosinate mixture is the simple combination of the individual reactions of NH₃ and sarcosinate with CO₂.
- Subject
- sarcosinate; adsorption kinetics; CO₂; aqueous ammonia
- Identifier
- http://hdl.handle.net/1959.13/1295960
- Identifier
- uon:19157
- Identifier
- ISSN:0888-5885
- Language
- eng
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