Excess Sodium Tetraphenylborate and Intermediates Decomposition Studies

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The stability of excess amounts of sodium tetraphenylborate (NaTPB) in the In-Tank Precipitation (ITP) facility depends on a number of variables. Concentration of palladium, initial benzene, and sodium ion as well as temperature provide the best opportunities for controlling the decomposition rate. This study examined the influence of these four variables on the reactivity of palladium-catalyzed sodium tetraphenylborate decomposition. Also, single effects tests investigated the reactivity of simulants with continuous stirring and nitrogen ventilation, with very high benzene concentrations, under washed sodium concentrations, with very high palladium concentrations, and with minimal quantities of excess NaTPB. These tests showed the following.The ... continued below

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42 p.

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Barnes, M. J. & Peterson , R. A. April 1998.

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Description

The stability of excess amounts of sodium tetraphenylborate (NaTPB) in the In-Tank Precipitation (ITP) facility depends on a number of variables. Concentration of palladium, initial benzene, and sodium ion as well as temperature provide the best opportunities for controlling the decomposition rate. This study examined the influence of these four variables on the reactivity of palladium-catalyzed sodium tetraphenylborate decomposition. Also, single effects tests investigated the reactivity of simulants with continuous stirring and nitrogen ventilation, with very high benzene concentrations, under washed sodium concentrations, with very high palladium concentrations, and with minimal quantities of excess NaTPB. These tests showed the following.The testing demonstrates that current facility configuration does not provide assured safety of operations relative to the hazards of benzene (in particular to maintain the tank headspace below 60 percent of the lower flammability limit (lfl) for benzene generation rates of greater than 7 mg/(L.h)) from possible accelerated reaction of excess NaTPB. Current maximal operating temperatures of 40 degrees C and the lack of protection against palladium entering Tank 48H provide insufficient protection against the onset of the reaction. Similarly, control of the amount of excess NaTPB, purification of the organic, or limiting the benzene content of the slurry (via stirring) and ionic strength of the waste mixture prove inadequate to assure safe operation.

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42 p.

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INIS; OSTI as DE98053169

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  • Other Information: PBD: Apr 1998

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  • Other: DE98053169
  • Report No.: WSRC-TR--98-00099
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/651624 | External Link
  • Office of Scientific & Technical Information Report Number: 651624
  • Archival Resource Key: ark:/67531/metadc708020

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • June 13, 2016, 7:28 p.m.

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Barnes, M. J. & Peterson , R. A. Excess Sodium Tetraphenylborate and Intermediates Decomposition Studies, report, April 1998; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc708020/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.