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Oiling‐Out and Crystallization of Vanillin from Aqueous Solutions
Author(s) -
Sorensen Thore J.
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400201
Subject(s) - crystallization , supersaturation , aqueous solution , vanillin , scattering , amorphous solid , chemical physics , materials science , small angle x ray scattering , crystallography , light scattering , chemical engineering , chemistry , thermodynamics , physics , optics , organic chemistry , engineering
Dynamic light scattering experiments performed on precrystalline liquid solutions that shows oiling‐out at higher vanillin concentration resulted in scattering from assumed precrystalline clusters. The structures appear during crash‐cooling into the supersaturated area and grow to µm size. They decrease in size and number at the appearance of visible crystals and might be unstable amorphous phases or or precrystalline structures that fit into the classical theory of crystallization. The data presented explains as to why the temperature‐time history influences the behavior of crystallization and shows that structures can coexist with the oiling‐out phenomena, but not as a direct part of it.