화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.53, No.34, 13550-13556, 2014
Experimental Study of Salt Bead Dissolutions in Aqueous Solvents
Bead dissolutions of several chloride compounds-lithium chloride-potassium chloride (LiCl-KCl) eutectic, lithium chloride (LiCl), strontium chloride (SrCl2), cerium chloride (CeCl3), lanthanum chloride (LaCl3), praseodymium chloride (PrCl3), and yttrium chloride (YCl3)-were performed in water at 20 C. Additional bead dissolutions involved LiCl-KCl beads in two types of brine solvents. Each bead diameter was measured and found to change linearly with time in water. A model regression to these measured data resulted with R-2 > 0.942. Results indicated dissolution was faster in water than in the brines. Calculated mass transfer coefficients were in the range of 1.00 x 10(-2) mm s(-1) to 2.67 x 10(-2) mm s(-1). Based on a Sherwood correlation, Sh = 2 + 0.0254Gr(0.333)Sc(0.577), calculated diffusion coefficients were in the range of 10(-5) mm(2) s(-1) to 10(-3) mm(2) s(-1). Results implied mass transfer of the eutectic was dominated by diffusion, whereas a transition from natural convection to diffusion was inferred for the other solutes.