期刊
CHEMSUSCHEM
卷 14, 期 20, 页码 4439-4453出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100786
关键词
carbon dioxide removal; direct air capture; reverse osmosis; capacitive deionization; sustainable chemistry
资金
- Harvard University Climate Change Solutions Fund
The alkalinity concentration swing (ACS) is a new process for direct air capture of carbon dioxide. It involves concentrating alkaline solution loaded with dissolved inorganic carbon to increase CO2 partial pressure for extraction. Energy models show ACS compares favorably to other approaches in capturing one million tonnes of CO2 per year with lower energy requirements.
The alkalinity concentration swing (ACS) is a new process for direct air capture of carbon dioxide driven by concentrating an alkaline solution that has been exposed to the atmosphere and loaded with dissolved inorganic carbon. Upon concentration, the partial pressure of CO2 increases, allowing for extraction and compression. Higher concentration factors result in proportionally higher outgassing pressure, and higher initial alkalinity concentrations at the same concentration factor outgas a higher concentration of CO2. Two desalination technologies, reverse osmosis and capacitive deionization, are examined as possible ACS implementations, and two corresponding energy models are evaluated. The ACS is compared to incumbent technologies and estimates for water, land, and energy requirements for capturing one million tonnes of CO2 per year are made. Estimates for the lower end of the energy range for both approaches compare favorably to other approaches, such as solid sorbent and calcining methods.
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