The stable sulfur isotope of mass 34 is an attractive tracer material in certain biological and physiological research. This investigation undertook to obtain a supply of sulfur 34 and to provide engineering data for a chemical exchange process for separating sulfur isotopes.The performance of 1,/4-inch Raschig rings in a column 2 inches in diameter and 63 feet high was correlated as LITERATURE CITED

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A simple process for the concentration of aqueous nitric acid has been demonstrated in pilot plant operation as part of the Consolidated Fuel Reprocessing Program at the Oak Ridge National Laboratory. A mathematical model of this process shows reasonable agreement with important experimental data. This extractive distillation process utilizes an aqueous solution of magnesium nitrate as the solvent and is a simplified version of that used commercially. The process features two vessels for the distillation and solvent recovery operations. The acid feed and product compositions and flow rates were determined with reasonable certainty. The internal process flow rates and compositions of the boiling solutions in the distillation and solvent recovery vessels could not be determined with as much certainty. The development and use of a process model provides greater insight into the process than was available from the experimental data and also provides methods of process design and simulation.