Development of an Electrolytic Cation Exchange Module for the Simultaneous Extraction of Carbon Dioxide and Hydrogen Gas from Natural Seawater

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• 作者：Heather D. WillauerFelice DiMascio ; Dennis R. Hardy ; Frederick W. Williams
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：31
• 期：2
• 页码：1723-1730
• 全文大小：453K
• ISSN：1520-5029

文摘

An electrolytic cation exchange process has been developed to extract large quantities of carbon dioxide (CO₂) from natural seawater where it is in the form of bicarbonate and carbonate, and to simultaneously produce H₂ gas in quantities and ratios (3:1 H₂ to CO₂) intended for future synthesis of hydrocarbons. During the early stages of development, optimizing the energy efficiency and CO₂ production efficiency of the process is key to its future practical implementation. Both efficiencies are impacted specifically by the amount of time needed to re-establish equilibrium conditions in the module after a polarity reversal. Three electrolytic cation exchange module (E-CEM) configurations were tested and evaluated to determine the parameters that had the most significant effects on shortening the re-equilibration times after polarity reversal. From these evaluations, a new fourth custom E-CEM was designed, built, and tested that lowered seawater pH 65% faster so that carbonate and bicarbonate in the seawater were re-equilibrated to CO₂ gas for recovery and the electrical resistance was reduced by 31%. These results are important for the future scale-up and implementation of such a process.