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- W2185909503 abstract "The Commissariat a L’Energie Atomique (CEA) and the Compagnie Generale des Matieres Nucleaires (COGEMA) have developed [1] surfactant liquid solutions to remove organic matter located at the surfaces of equipment used in reprocessing facilities. This equipment may be covered with Tri Butyl Phosphate (TBP) or products resulting from TBP radiolysis like Dibutylphosphate (DBP) or Monobutylphosphate (MBP). These molecules can be combined with Uranium, Plutonium or metal ions like zirconium. Conventional treatments like sodium hydroxide usually have poor degreasing effect, so few of these products can be removed successfully. The aim of developing new formulations is to achieve a better degreasing effect and to eliminate sodium ions from the secondary liquid wastes to ease glass formation. During the past years, low alkaline formulations have been developed (sodium content about 0,5 M to 1 M) [2]. More recently, it was decided to try to remove sodium ions completely and keep a high degreasing efficiency. A study of a degreasing formulation based on the original use of fully soluble lowfoaming surfactants in nitric acid medium has been performed. A combination of two non-ionic surfactants was chosen. Non-ionic surfactants have a low Critical Micellar Concentration (CMC) which allows minimization of organic matter in the solution. The first surfactant is a polyglycolic ether fatty alcohol (FA) leading to high solubilization capability. The second is a Block Copolymer (BC) having a high wetting power. Solubilization of TBP occurs in the micelles formed above the CMC. The standard formulation has a total amount of 10 g/L surfactants. This surfactant formulation increases the maximum TBP solubilization to more than 5 g/L, about 15 times larger than the true value of TBP solubility in the acid alone." @default.
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- W2185909503 date "2005-01-01" @default.
- W2185909503 modified "2023-09-24" @default.
- W2185909503 title "NEW SURFACTANT LIQUID FORMULATION FOR TBP REMOVAL IN REPROCESSING PLANTS FOR DECOMMISSIONING PURPOSES" @default.
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