Efficiency of thorium extraction by primary amines as a function of pulse frequency and amplitude in a pulsed sieve-plate column Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/r207ts054

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  • The amine extraction process is evaluated for pulse column operation. A 0.1 M solution of Primene JM-T (a commercial mixture of tertiary-alkyl primary amines) in a kerosene-base diluent is the extractant for thorium feed in aqueous acidic sulfate solutions. Equilibrium isotherms at room temperature are presented at aqueous acidities of 1.0 and 0.1 N H⁺ ion concentration. At the 0.1 N H⁺ concentration, isotherms are presented with and without added aqueous Na₂SO₄, and the effect of insufficient sulfate ion is demonstrated. A low-range fluorometric thorium analytical method, adapted from the literature, is presented. With a 2 ppm thorium lower limit, the method makes possible the determination of the low-thorium concentration portions of an equilibrium isotherm. Pulse column operational data are presented showing stable and efficient extraction operation in a pulse frequency-amplitude range of 110 to 180 in./min. In this operational range, aqueous feed concentrations of 4.94 to 5.19 grams per liter were stripped to a raffinate concentration of < 2 ppm in eight 2-inch-spaced plates mounted in a 3-inch I.D. column using aqueous and organic flow rates of 123 and 250 milliliters per minute respectively. This represents a separation factor of > 2,500.
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