Solvent Performance in THTR Nuclear Fuel Reprocessing. Part II: On the Formation of Dibutyl Phosphoric Acid by Radiolytic and Hydrolytic Degradation of the TBP-n-Paraffin Extractant

Review Article: The Effects of Radiation Chemistry on Solvent Extraction: 1. Conditions in Acidic Solution and a Review of TBP Radiolysis

“…[65] Stieglitz and Becker, [57] and Becker et al [92] also reported increased HDBP production in the presence of aqueous nitric acid, as did Kulikov et al [58] However, reduced HDBP yields from TBP/alkane solutions have also been reported due to the presence of aqueous nitric acid. [61,93] Clay and Witort [85] reported decreasing G HDBP in oxygenated, aqueous TBP solution (,2 mM TBP) with increasing nitric acid concentration. This they attributed to competition for hydroxyl radical according to Eq.…”

Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene

“…Stieglitz and Becker [16] have reported increased HDBP production in the presence of aqueous nitric acid. However, Brodda et al [17] have suggested that in TBP solution the yield of HDBP decreases with the increase of nitric acid concentration. Peterman et al [18] have investigated the radiolysis of a TBP/n--dodecane process solvent in contact with aqueous nitric acid.…”

“…The work by Mincher et al [1] as well as the TBP book by Navratil [3] have described most of the processes. Most of the research performed on the degradation of TBP solvents has focused on the identifi cation and measurement of degradation products [4][5][6][7], the degradation mechanisms [8][9][10] and the degradation impact factors, such as diluent [11][12][13], water [14, Infl uence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene 15], nitric acid [16][17][18][19], metal ion [20], atmosphere [21], etc. For example, Bellido et al [13] have suggested that the aromatic diluents can reduce the extent of radiolytic degradation of TBP.…”

Studies on Pu238 induced alpha radiolysis of the solvent TBP

“…Khaikin has suggested that HDBP is a stable product resulting from reaction of dissolved oxygen and the TBP radical [9]. The degradation has also been investigated as a function of diluent [12][13][14][15][16], water and nitric acid [17][18][19][20][21], temperature [22,23], and metal ions [20,24,25].…”