Membrane crystallization in an integrated process for CO2 capture

Sang Sefidi, Vida;Garcia Alvarez, Mar;Sparenberg, Marie-Charlotte;Luis Alconero, Patricia
(2021) 3rd International Workshop on Membrane Distillation and Innovating Membrane Operations in Desalination and Water Reuse - mdravel — Location: Ravello (SA) – Italy (postponed due to Covid; possible new date in 2023) (12.April.2021)

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(en) Carbon dioxide (CO2) capture and sequestration/reutilization has become one of the most urgent technological demands in order to reduce CO2 emissions in a global context. Conventional technology is typically based on absorption using selective solvents, such as monoethanolamines, and a posterior desorption process using heat to release pure CO2 and reuse the amines. However, this process presents strong limitations [1]: i) amine production is very energy intensive, which involves non-negligible CO2 emissions; and ii) the desorption process requires energy, and again, we can expect CO2 emissions associated to the production of the required energy. This means that even though CO2 is capture in the site, it is also emitted somewhere else, decreasing significantly the overall CO2 captured/CO2 emitted. In this context, membrane technology appears as a promising technique to capture CO2 and convert it into a valuable product. In this work, a novel process based on a first step of absorption followed by a second step using membrane crystallization is presented [2]. A liquid phase containing a mass transfer promoter (i.e., enzymes or amino acids) is used to capture CO2. After absorption, the (bi)carbonate solution is sent to the membrane crystallization unit so that the (bi)carbonate salts are produced. The mass transfer efficiency will be evaluated considering different membrane crystallization methods (i.e., osmotic membrane crystallization, direct contact membrane crystallization and vacuum membrane crystallization) and varying the operation conditions, such as feed velocity, temperature and vacuum. The effect of the presence of impurities will be also discussed. This process presents an alternative to conventional CO2 absorption-sequestration methods in order to valorize the CO2 while closing the carbon cycle.
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Sang Sefidi, V., Garcia Alvarez, M., Sparenberg, M.-C., & Luis Alconero, P. (2021). Membrane crystallization in an integrated process for CO2 capture. 3rd International Workshop on Membrane Distillation and Innovating Membrane Operations in Desalination and Water Reuse - mdravel, Ravello (SA) – Italy (postponed due to Covid; possible new date in 2023). https://hdl.handle.net/2078.5/220925