CO₂ hydration by immobilized carbonic anhydrase in Robinson-Mahoney and packed-bed scrubbers鈥?span style='font-style: italic'>Role of mass transfer and inhibitor removal

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• 作者：Faï ; ç ; al Larachi ; ^{faical.larachi@gch.ulaval.ca} ; Olivier Lacroix ; Bernard P.A. Grandjean
• 关键词：Carbon dioxide capture ; Human carbonic anhydrase II ; Robinson&ndash ; Mahoney basket scrubber ; Packed-bed scrubber ; Calcium carbonate ; Ion-exchange resin
• 刊名：Chemical Engineering Science
• 出版年：2012
• 期刊代码：18_00092509
• 类别：ce
• 出版时间：7 May, 2012
• 卷：73
• 期：Complete
• 页码：99-115
• 文件大小：1278 K

摘要

Catalytic hydration of CO₂ using immobilized human carbon anhydrase II was assessed in Robinson-Mahoney and packed-bed scrubbers. To analyze the impact of enzyme on CO₂ abatement, the mass transfer, non-enzymic film and bulk, and enzymic surface reaction steps were deconstructed using a multistage model and an ordered Bi Bi Iso Ping Pong kinetic model for the enzyme-mediated hydration kinetics of CO₂. Absorption in the Robinson-Mahoney reactor revealed the enzyme was passive while model analysis exposed gas-liquid and liquid-solid mass transfers as severely obstructing enzymic hydration. The packed bed achieved improvements in CO₂ abatement with enzyme-immobilized packings but was found to exhibit low mass transfer to fully exploit the enzyme鈥檚 high turnover. Leveraging strategies to lower bicarbonate were thus researched to enhance net CO₂ hydration kinetics by reducing backward dehydration. The most remarkable increase in CO₂ removal was obtained by integrating immobilized-enzyme absorption with microparticle ion-exchange resin to remove in-situ bicarbonate.