- Title
- Integration of a diamine solvent based absorption and coal fly ash based mineralisation for CO₂ sequestration
- Creator
- Yu, Bing; Yu, Hai; Li, Kangkang; Ji, Long; Yang, Qi; Chen, Zuliang; Megharaj, Mallavarapu
- Relation
- Fuel Processing Technology Vol. 192, Issue September 2019, p. 220-226
- Publisher Link
- http://dx.doi.org/10.1016/j.fuproc.2019.04.030
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Our previous studies have revealed that diamines containing one primary amine group exhibit a superior kinetics while retaining their intrinsic high capacities towards CO₂ absorption when compared with monoethanolamine. However, these diamine absorbents typically suffer from high regeneration energy due to the inherent structural stability of the formed carbamate species. In an effort to overcome this challenge, we developed a new CO₂ sequestration process that integrates the CO₂ absorption by a diamine solvent and the diamine regeneration as well as CO₂ mineralization by CaO-rich fly ash. Herein, we found that CO₂ rich diamine solutions can be chemically regenerated by fly ash with the stable cyclic performance via the CO₂ absorption - mineralization experiments, and the CO₂ sequestration capacity of the fly ash used in this process dominated the amine regeneration performance. The FT-IR analysis of species in the solution along with the characterizations of fly ash via SEM, EDX and XRD revealed that fly ash was effective to regenerate a diamine - 1-(2-hydroxyethyl)-4-aminopiperidine (C4) by deprotonation of C4H⁺, meanwhile, the CaO component in fly ash can react with CO₂ in the C4 solution to produce the calcium carbonate precipitate. This approach presents a significant energy saving alternative to the traditional CO₂ desorption process.
- Subject
- amine regeneration; fly ash; desorption process; CO₂ capture
- Identifier
- http://hdl.handle.net/1959.13/1403207
- Identifier
- uon:35126
- Identifier
- ISSN:0378-3820
- Language
- eng
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