Spent solvent is an organic waste the volume of which must be minimized. It has been decided to implement a distillation facility in order to split this spent solvent into three parts: recovered diluent and concentrated TBP, to be recycled, and a residue which contain the radioactivity and most of the impurities. This distillation is performed at low pressure and temperature, with thin films evaporators, in order to minimize the residence times in heated zones. The paper describes the process and the equipment employed. The R and D work which has been performed to define the process, size up the equipment and demonstrate the process is described, including the laboratory works, the pilot plant tests and the results of tests performed with a full scale prototype which has been built to demonstrate the whole process. The industrial facility, and the results of the first active runs are described briefly.
Ginisty, C; Leybros, J; Maynadier, P;  Pradel, P;  Dalverny, G; Lebaillif, M;  Moulin, J P 
- CEA Etablissement de la Vallee du Rhone, 30 - Bagnols-sur-Ceze (FR)
- Compagnie Generale des Matieres Nucleaires (COGEMA), 78 - Velizy-Villacoublay (FR)
- Compagnie Generale des Matieres Nucleaires (COGEMA) 50 - Cherbourg (FR). Etablissement de La Hague
- Societe Generale pour les Techniques Nouvelles (SGN), 78 - Saint-Quentin-en-Yvelines (FR)