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D2.4 - Packed-bed reactor using amine-ionic liquid -immobilized CAs blends for optimal capture of CO2 from off gas

Antonopoulou, Io; Rova, Ulrika; Christakopoulos, Paul


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    "language": "eng", 
    "title": "D2.4 - Packed-bed reactor using amine-ionic liquid -immobilized CAs blends for optimal capture of CO2 from off gas", 
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        "code": "760431", 
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        "title": "Biological routes for CO2 conversion into chemical building blocks", 
        "acronym": "BioRECO2VER", 
        "program": "H2020", 
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          "doi": "10.13039/501100000780", 
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      "CO2 capture process", 
      "amine-ionic liquid-immobilized CAs", 
      "enzymatic absorption"
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    "publication_date": "2020-11-25", 
    "creators": [
      {
        "name": "Antonopoulou, Io"
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        "name": "Rova, Ulrika"
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    "description": "<p>The goal of BioRECO2VER is to develop and validate the technical feasibility of more energy efficient and sustainable non-photosynthetic biotechnological processes for the capture and conversion of CO<sub>2</sub> from industrial point sources into valuable platform chemicals. One of the specific objectives of the project is the development and application of robust enzymes for CO<sub>2</sub> capture from industrial point sources and the improvement of a novel concept combining enzymatic absorption with ionic liquid-amine blends. It is aimed to achieve energy and cost reduction compared to the monoethanolamine (MEA)-based state-of-the-art technologies, increased resistance to major impurities and yield a concentrated gas stream of at least 95% CO<sub>2</sub>.<br>\nThe objective of D2.4 was to demonstrate the operation of a packed-bed reactor using amine-ionic liquid-immobilized CAs blends for optimal capture of CO<sub>2</sub> from off gas. Scaling up of the CO<sub>2</sub> capture process using a packed-bed reactor requires the exploitation of the research outcomes of the project regarding CA improvement and the solvent development. The combination of CA with an MDEA-ionic liquid mixture would result in a ternary solvent with exceptional absorption properties compared to standard MDEA solvents and reduced regeneration temperatures compared to MEA-based technologies. Integration of immobilized and/or improved CA proved not to be a viable option for scaling up the CO<sub>2</sub> capture. Nevertheless, integration of CA in free form with an amine-ionic liquid mixture for the CO<sub>2</sub> capture from off gas using a packed-bed reactor on an automated absorption and stripping pilot plant, resulted in several fold higher absorption rates and CO<sub>2</sub> recovery compared to aqueous solution of MDEA. CA-assisted CO<sub>2</sub> absorption resulted in higher initial absorption rates, reduced absorption times and overall 25% higher CO<sub>2</sub> recovery compared to absorption using only the ionic liquid-amine blend. This would improve the economics of CO<sub>2</sub> capture technologies by reducing operation times and energy consumption due to regeneration, yielding a pre-treated concentrated gas stream of at least 92% CO<sub>2</sub>. The set-up is now ready to perform real off gas pre-treatment for validation testing during the project.</p>"
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