Impact of the Low-Temperature Reactivity of Reillex(TM) HPQ on Actinide Processing Page: 4 of 26
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J.E. Laurinat, W.J. Crooks III, and E.A. Kyser III
a safety risk due to pressurization of the ion exchange column. However, organic
synthesis can fine-tune the chemical structure of the resins to enable kinetically slow
oxidation reactions under typical operating conditions. ReillexTM HPQ anion exchange
resin was developed and targeted for applications in the nuclear industry that require
thermal stability to nitric and radiation exposure. (1) This resin is composed of
vinylpyridine copolymer subunits, which are thermally more stable than traditional
styrene-alkyl ammonium copolymer subunits.
In the preceeding article(2), ReillexTM HPQ exhibited runaway reaction behavior
in nitric acid above 100 0C, in addition to a surprising low-temperature exotherm (LTE)
that initiated at about 69 C. Based on the analysis of the reaction products, a reactivity
study of model compounds, and literature precedents, the LTE was attributed to
ethylbenzene pendant groups. To eliminate the LTE, a nitric acid pretreatment was
developed to oxidize the ethylbenzene pendant groups selectively, and to reduce the
resin's low temperature reactivity. Safety concerns with performing this pretreatment on
a process scale led to an evaluation of alternate pretreatments, but none was identified. In
this work, Reactive System Screening Tool (RSST) data and a computational model are
used to predict the amount of pressurization of a typical process-scale ion exchange
column due to inadvertent heating that activates the LTE.
EXPERIMENTAL
Reagents
All chemicals used in this study were reagent grade and were used without
additional purification. Eight molar nitric acid solutions were prepared from dilutions of2
9/18/2001
WSRC-MS-2001-00720
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Laurinat, J.E. Impact of the Low-Temperature Reactivity of Reillex(TM) HPQ on Actinide Processing, article, October 2, 2001; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc719053/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.