Journal
CHEMICAL ENGINEERING JOURNAL
Volume 335, Issue -, Pages 338-344Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.10.136
Keywords
CO2 capture; CO2 sequestration; Calcium carbonate; Amine regeneration; Chemical regeneration
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Funding
- Korea Institute of Energy Research (KIER) [B7-2431-01]
- National Research Council of Science & Technology (NST), Republic of Korea [KIER3-1] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To avoid the main disadvantage of the carbon dioxide (CO2) capture process, namely the large amount of energy consumed to regenerate the amine absorbent using current thermal methods, chemical regeneration has been introduced as a novel method to regenerate the amine. Chemical regeneration deploys a swing in the pH of the amine absorbent rather than the swing in temperature of typical thermal regeneration procedures, and hence reduces the regeneration energy. Here we tested calcium chloride (CaCl2) and calcium hydroxide (Ca(OH)(2)) as a calcium source for CO2 desorption and a pH swing agent for amine regeneration. After desorbing from the amine, CO2 in our procedures reacted with Ca2+ to form calcium carbonate (CaCO3). Forming precipitated CaCO3 is a permanent way to sequester CO2. Since carbonates have a low energy level compared to CO2, we expect the developed method to be an economical and energy-efficient process.
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