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REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE 23-07-2010 Memorandum Report 3. DATES COVERED (From - To) 4. TITLE AND SUBTITLE Extraction of Carbon Dioxide from Seawater by an Electrochemical Acidification Cell Part I—Initial Feasibility Studies 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) Felice DiMascio, Heather D. Willauer, Dennis R. Hardy, M. Kathleen Lewis, and Frederick W. Williams 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER 61-9189-0-0-5 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) Naval Research Laboratory, Code 6180 4555 Overlook Avenue, SW Washington, DC 20375-5320 8. PERFORMING ORGANIZATION REPORT NUMBER NRL/MR/6180--10-9274 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) Office of Naval Research One Liberty Center 875 North Randolph Street, Suite 1425 Arlington, VA 22203 10. SPONSOR / MONITOR’S ACRONYM(S) ONR 11. SPONSOR / MONITOR’S REPORT NUMBER(S) 12. DISTRIBUTION / AVAILABILITY STATEMENT Approved for public release; distribution is unlimited. 13. SUPPLEMENTARY NOTES 14. ABSTRACT An electrochemical acidification cell is developed and tested as a method for extracting large quantities of carbon dioxide from seawater for use as a feedstock for jet-fuel synthesis at sea. The electrolytic regeneration of cation exchange resin was demonstrated, allowing simultaneous and continuous ion exchange and regeneration to occur within the cell along with control of the seawater pH. The CO2 in the seawater was readily removed at pHs of less than 6.0. In addition, the cell produced a portion of the hydrogen needed for jet-fuel synthesis without additional energy penalties. 15. SUBJECT TERMS Carbon dioxide Seawater Acidification cell Electrochemical Ion exchange 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT UL 18. NUMBER OF PAGES 23 19a. NAME OF RESPONSIBLE PERSON Heather D. Willauer a. REPORT b. ABSTRACT c. THIS PAGE Unclassified Unclassified Unclassified 19b. TELEPHONE NUMBER (include area code) (202) 767-2673 i Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std. Z39.18PDF Image | CO2 from Seawater
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