Development of a new CO2 capture process with vacuum-assisted calcination for the direct production of pure CO2
The urgent need to achieve net-zero CO<inf>2</inf> emissions by mid-century has intensified research into cost-effective and scalable carbon capture technologies. Calcium Looping is a promising high-temperature process for CO<inf>2</inf> separation, although its widespread de...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:dnet:digitalcsic_::adb5189fa7ea951df9834ce0e48faa34 |
| Acceso en línea: | http://hdl.handle.net/10261/430721 https://api.elsevier.com/content/abstract/scopus_id/105036433090 |
| Access Level: | acceso abierto |
| Palabra clave: | Vacuum calcination Calcium looping Chemical looping CO2 capture Pure CO2 http://metadata.un.org/sdg/7 http://metadata.un.org/sdg/9 Ensure access to affordable, reliable, sustainable and modern energy for all Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation |
| Sumario: | The urgent need to achieve net-zero CO<inf>2</inf> emissions by mid-century has intensified research into cost-effective and scalable carbon capture technologies. Calcium Looping is a promising high-temperature process for CO<inf>2</inf> separation, although its widespread deployment is hindered by the high energy demand of CaCO<inf>3</inf> calcination and the complexity of heat management in packed-bed systems. This work presents the first experimental demonstration of a novel Calcium Looping process that integrates vacuum-assisted calcination to enable autothermal operation and the direct production of ultra-pure CO<inf>2</inf> without downstream purification. When pressure during calcination is reduced to below 0.1 bar, the thermal energy stored in solids during the preceding carbonation step drives CaCO<inf>3</inf> decomposition at significantly lower temperatures. As a result, a CO<inf>2</inf> stream of near 100% purity is obtained. Laboratory-scale tests in packed-bed reactors at TRL3-4 confirm that the process achieves capture efficiencies above 95% for gas streams containing 15–50 vol% CO<inf>2</inf>. Peak temperatures exceeding 800 °C are reached during carbonation, followed by effective regeneration under vacuum. Additional experiments demonstrate the benefits of moderate pressurization (up to 4 bar) during the CO<inf>2</inf> capture stage. The integration of chemical looping combustion (CLC) stages using CuO-based oxygen carriers provides in situ heat, enabling cyclic operation and overcoming thermodynamic limitations for low-CO<inf>2</inf> feeds. |
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