Verfahren zum Reinigen von Loesungsmitteln

摘要

Contaminated solvents which have been employed in nuclear industrial processes are purified by steam distillation, first adding a quantity of uranium salt to the solvent or mixture of solvents so that the resulting mixture has less than 20 g/l of uranium, and then contacting this solvent mixture with steam until it has been reduced to 2% of its original volume. The process may be carried out at atmospheric pressure or under reduced pressure, e.g. 50-400 mm. Hg. The solvent may be reduced by steam distillation to a volume corresponding to 10 to 15% of its original volume before the uranium salt is added and further steam distillation takes place. The uranium salt may be uranyl nitrate. An example given is concerned with a mixture of solvents consisting of 30% by weight tributyl phosphate and 70% by weight dodecane.