CO2 capture and crystallization as sodium carbonate using membrane contactors
(2018)
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Details
- Authors
- Supervisors
- Luis Alconero, Patricia
- Abstract
- Carbon dioxide (CO2) is the main greenhouse gas contributing to climate change, one of the most critical issues that humanity must face in our days. The concentration of CO2 has strongly increased due to the human activity since the industrial revolution and is getting records every year (408 ppm in 2018). CO2 emissions affect directly or indirectly the life on Earth: they contribute to the increase of temperature of the atmosphere, the seas and the continents; to raise the level of the oceans because of ice mass unfrozen; to produce extreme climate conditions; to lose biodiversity and to compromise the human health and food production. In this thesis, CO2 is not considered as a waste but a source of carbon to be revalorized. Concretely, the main approach followed in this thesis is the conversion of CO2 to sodium carbonate (Na2CO3) for further reuse in the cement or ceramic industry, for example. A novel process based on membrane technology has been proposed. Two consecutive steps (absorption and crystallization) are involved. Results revealed that a CO2 removal higher than 95% and 75% was reached in a packed column and a membrane contactor, respectively, under the studied operation conditions, and Na2CO3.10H2O crystals free of impurities were obtained. In summary, this two-step membrane process (absorption-crystallization) displays an alternative to mitigate CO2 by converting it into valuable product. Besides, the salt treatment is technically and economically demonstrated, opening the scope for a large range of sustainable applications
- Affiliations
Citations
Ruiz Salmon, I. (2018). CO2 capture and crystallization as sodium carbonate using membrane contactors. https://hdl.handle.net/2078.5/57358