Feasibility of CO2 Extraction from Seawater and Simultaneous Hydrogen Gas Generation Using a Novel and Robust Electrolytic Cation Exchange Module Based on Continuous Electrodeionization Tec

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• 作者：Heather D. Willauer ; Felice DiMascio ; Dennis R. Hardy ; Frederick W. Williams
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：August 6, 2014
• 年：2014
• 卷：53
• 期：31
• 页码：12192-12200
• 全文大小：409K
• ISSN：1520-5045

文摘

A novel, robust, and innovative electrolytic cation exchange process has been used to efficiently extract large quantities of CO₂ in the form of bicarbonate and carbonate from natural seawater, and to simultaneously produce H₂ gas in quantities and ratios intended for possible future production of hydrocarbons. This indirect approach acidifies seawater by using the protons electrolytically produced by electrolysis at the anode. Electrons concurrently produced with these protons are subsequently consumed at the cathode forming hydrogen gas. The ability to degas and recover 92% [CO₂]_T from natural seawater was demonstrated. The potential detrimental effects of mineral deposits on the module鈥檚 electrode surfaces were successfully mitigated by cyclically changing the module electrode鈥檚 polarity. This feasibility study marks the first time that CO₂ has been successfully extracted on a continuous basis from natural seawater. In addition, there is no energy or economic penalty to extract CO₂ from the seawater matrix, above the energy needed to produce hydrogen.