Double liquid membrane system for the removal of actinides and lanthanides from acidic nuclear wastes

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Supported liquid membranes (SLM), consisting of an organic solution of n-octyl-(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) and tributyl-phosphate (TBP) in decalin are able to perform selective separation and concentration of actinide and lanthanide ions from aqueous nitrate feed solutions and synthetic nuclear wastes. In the membrane process a possible strip solution is a mixture of formic acid and hydroxylammonium formate (HAF). The effectiveness of this strip solution is reduced and eventually nullified by the simultaneous transfer through the SLM of nitric acid which accumulates in the strip solution. A possible way to overcome this drawback is to make use of a second SLM … continued below

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33 pages

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Chiarizia, R. & Danesi, P.R. January 1, 1985.

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Supported liquid membranes (SLM), consisting of an organic solution of n-octyl-(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) and tributyl-phosphate (TBP) in decalin are able to perform selective separation and concentration of actinide and lanthanide ions from aqueous nitrate feed solutions and synthetic nuclear wastes. In the membrane process a possible strip solution is a mixture of formic acid and hydroxylammonium formate (HAF). The effectiveness of this strip solution is reduced and eventually nullified by the simultaneous transfer through the SLM of nitric acid which accumulates in the strip solution. A possible way to overcome this drawback is to make use of a second SLM consisting of a primary amine which is able to extract only HNO/sub 3/ from the strip solution. In this work the results obtained by experimentally studying the membrane system: synthetic nuclear waste/CMPO-TBP membrane/HCOOH-HAF strip solution/primary amine membrane/NaOH solution, are reported. They show that the use of a second liquid membrane is effective in controlling the HNO/sub 3/ concentration in the strip solution, thus allowing the actinide and lanthanide ions removal from the feed solution to proceed to completion. 15 refs., 10 figs., 1 tab.

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33 pages

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NTIS, PC A03/MF A01; 1.

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  • 4. symposium on separation science and technology for energy applications, Knoxville, TN, USA, 20 Oct 1985

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  • Other: DE85018443
  • Report No.: CONF-851011-2
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5263452
  • Archival Resource Key: ark:/67531/metadc1069882

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1985

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  • Feb. 4, 2018, 10:51 a.m.

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  • Feb. 5, 2021, 1:51 p.m.

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Chiarizia, R. & Danesi, P.R. Double liquid membrane system for the removal of actinides and lanthanides from acidic nuclear wastes, article, January 1, 1985; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1069882/: accessed August 16, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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