Fractional Solidification Phenomena

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Abstract
Zone melting of organic compounds was observed under the microscope. A host of phenomena were noted that can greatly affect the separation attained in a fractional-solidification operation. Liquid and gaseous inclusions moved toward the melt in some systems and farther into the solid in other situations. Sometimes impure melt was sucked into the frozen solid through cracks. Insoluble foreign particles were both bounced and incorporated by freezing interfaces of camphor and anthracene. Oscillations in interface position were caused by irregular free connection both inside and outside the sample cells. Bubbles in the melt sometimes caused agitation of the melt and other times selective growth of a volatile component. Bulk drainage and falling crystals from horizontal melting interfaces were observed. During melting of camphor-anthracene mixtures some anthracene platelets grew larger.
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