Abstract
The present work deals with investigations of crystal morphology of acrylic acid with respect to water content in the melt and the driving force applicable in terms of supercooling β. The intention is to measure absolute growth rates and aspect ratios depending on different conditions to provide a basis for suspension crystallization investigations. Water in the melt of acrylic acid induces the formation of a hollow cavity at the crystal extremities and powers a needlelike crystal habit. The higher the supercooling and water content, the higher the tendency to form needlelike crystals and the larger the length of the occurring cavity. After measurements, growth rates of the developed faces are simulated by using well-known growth rate equations. A model of the occurring growth mechanism, which also involves formation of a hollow cavity at the crystal extremities, is developed. On the basis of the measured data, a general prediction of the filtration behavior is possible and a preselection of rough process parameters can be made.
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