REMOVAL OF CHLORIDE FROM ACIDIC SOLUTIONS USING NO2

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Chloride (Cl{sup -}) salt processing in strong acids is used to recycle plutonium (Pu) from pyrochemical residues. The Savannah River National Laboratory (SRNL) is studying the potential application of nitrogen dioxide (NO{sub 2}) gas to effectively convert dissolved pyrochemical salt solutions to chloride-free solutions and improve recovery operations. An NO{sub 2} sparge has been shown to effectively remove Cl{sup -} from solutions containing 6-8 M acid (H{sup +}) and up to 5 M Cl{sup -}. Chloride removal occurs as a result of the competition of at least two reactions, one which is acid-dependent. Below 4 M H+, NO2 reacts with ... continued below

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Visser, A; Robert Pierce, R & James Laurinat, J August 22, 2006.

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Chloride (Cl{sup -}) salt processing in strong acids is used to recycle plutonium (Pu) from pyrochemical residues. The Savannah River National Laboratory (SRNL) is studying the potential application of nitrogen dioxide (NO{sub 2}) gas to effectively convert dissolved pyrochemical salt solutions to chloride-free solutions and improve recovery operations. An NO{sub 2} sparge has been shown to effectively remove Cl{sup -} from solutions containing 6-8 M acid (H{sup +}) and up to 5 M Cl{sup -}. Chloride removal occurs as a result of the competition of at least two reactions, one which is acid-dependent. Below 4 M H+, NO2 reacts with Cl- to produce nitrosyl chloride (ClNO). Between 6 M and 8 M H{sup +}, the reaction of hydrochloric acid (HCl) with nitric acid (HNO{sub 3}), facilitated by the presence of NO{sub 2}, strongly affects the rate of Cl{sup -} removal. The effect of heating the acidic Cl{sup -} salt solution without pre-heating the NO{sub 2} gas has minimal effect on Cl{sup -} removal rates when the contact times between NO{sub 2} and the salt solution are on the order of seconds.

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  • Journal Name: Industrial and Engineering Chemistry

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  • Report No.: WSRC-STI-2006-00102
  • Grant Number: DE-AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 891679
  • Archival Resource Key: ark:/67531/metadc875566

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  • August 22, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 2, 2016, 5:07 p.m.

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Visser, A; Robert Pierce, R & James Laurinat, J. REMOVAL OF CHLORIDE FROM ACIDIC SOLUTIONS USING NO2, article, August 22, 2006; [Aiken, South Carolina]. (digital.library.unt.edu/ark:/67531/metadc875566/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.