Laboratory Studies of the Pentaether Process for the Recovery and Decontamination of Uranium Page: 7
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white, and no gas was observed during that tine. There is an lmedl^te and
rapid reaction between 16fl HNO^ or 8g HNO^ and commercial pentaetherj the
pontaether darkens and turns brown with evolution of gas*
Preliminary single batch experiment a were performed using an experi-
mental dissolver solution to test the stability of pentaether under Intense
radiation* 1.5 ml. of distilled pentaether was nixed with 1.5 ml. of
solution having a p-Y activity of 1.2 x 10^ c/m/ml,
an a~activity of 7 x 10^ e/m/ml. and concentrations of uranium and
0.23H HNO^. Under these conditions approximately half of the uranium pre-
sent was extracted into the pentaether at equilibrium. After mixing for
three minutes, the p-T activity of the pentaether phase vas found to reach
1.0 x 10 c/m/al, which is 0.82 percent of the fission product activity In
the feed. This activity level was not increased by further stirring for 90
minutes, or by standing 14 hours and again stirring for 30 minutes. It vas
therefore concluded that three minutes1 mixing is sufficient to reach a
stable equilibrium. Settling time after each mixing vas observed to be
10-15 seconds. No color change vas observed in the pentaether during the
A sini lar experiment with commercial pentaether however, shoved
that it continued to extract p-Y activity until approximately ten
percent vas in the organic phase after twenty hours of contacting
with intermittent stirring. Distilled pentaether which had bson used
in a countercurrent batch extraction of uranium from dissolver
solution vas stripped with water, 2£! NaOH, 0.1£ HWO^, and finally with
water again. An infra-red transmission spectrogram was obtained on
this pentaether and, except for the hydroxyl group absorption booause
of the water saturation, was identical with that of the initial distilled
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Hicks, T. E.; Mayer, P. C. & Crandall, Howard William. Laboratory Studies of the Pentaether Process for the Recovery and Decontamination of Uranium, report, February 16, 1951; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc173134/m1/6/: accessed August 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.