Impurity Trapping during Crystallization from Melts

Abstract

An apparent interfacial distribution coefficient resulting from liquid trapping at a dendritic (rough) interface is successfully used to correlate observed nonequilibrium solid compositions of the tolane-bibenzyl, stilbene-bibenzyl, Al-Cu and salol-thymoi systems during growth from the melt.

The effect of crystal size on occlusion formation during crystallization from solution

“…The presence of occlusions in crystals grown from solution and the melt has been widely reported in the literature (Belyustin and Fridman (1968), Brooks .et al (1968), Denbigh and White (1966), Von Batchelder and Vaughan (1966), Pilkington and Dunning (1973), Baker and Cahn (1969), Hellawel~(1965), Wilcox (1964), Edie and Kirwan (1973), Ozum and Kirwan (1976), Myerson and Kinvan (1977a)). Edie and Kirwan (1973) postulated that occlusion formation (hence solvent trapping) was the result of the crystal interface becoming unstable and growing dendritically with the dendrite arms impinging on one, another in such a way as to form the occlusions. Edie and Kirwan (1973) used results from the literature on the radius and spacing of dendrites in metal systems to develop a quantitative relation between solvent trapping and various process variables (i.e., crystal growth velocity, interfacial temperature gradient).…”

“…These second phase impurities are called occlusions (inclusions).The presence of occlusions in crystals grown from solution and the melt has been widely reported in the literature (Belyustin and postulated that occlusion formation (hence solvent trapping) was the result of the crystal interface becoming unstable and growing dendritically with the dendrite arms impinging on one, another in such a way as to form the occlusions. Edie and Kirwan (1973) used results from the literature on the radius and spacing of dendrites in metal systems to develop a quantitative relation between solvent trapping and various process variables (i.e., crystal growth velocity, interfacial temperature gradient). This relation was refined by Myerson and Kinvan (1977b), who obtained a relation that predicted increased trapping with increased crystal growth velocity and a decrease in the absolute value of the interfacial temperature gradient.…”

The Growth, Structure, and Properties of Sea Ice

“…There have been some attempts to analyze this situation (Edie and Kirwan 1973, Myerson and Kirwan 1977a,b, Ozim and Kirwan 1976. In the last reference this approach was applied to the freezing of stirred NaCl-H 2 0 solutions with considerable success.…”

Effect of Taylor Vortex on Melt Crystallization of Fatty Acids

“…To use WCO as a source of biofuel, separation of such saturated FAs from triglyceride is necessary. Melt crystallization has been applied to commercial separation processes as one of the energy‐efficient separation methods of multicomponent liquid mixtures or a melt, that solidify on cooling, to obtain one or more of the components in relatively pure form . The purity of the obtained solid depends on the kinetics of the solute distribution at a solid−liquid (S−L) interface between two phases of the melt and the solid .…”