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The emulsion crystallization of hydrogenated castor oil into long thin fibers

 Niels De Meirleir a) b) Linda Pellens b) Walter Broeckx b) Wim De Malsche a)


a) Vrije Universiteit Brussel, Department of Chemical Engineering, Pleinlaan 2, 1050 Brussels, Belgium
b) Procter & Gamble Eurocor N.V., Temselaan 100, 1853 Strombeek-Bever, Belgium


Journal of Crystal Growth, Volume 383, 15 November 2013, Pages 51–56
[DOI.org/10.1016/j.jcrysgro.2013.08.010]

 

Abstract

 

The present study discusses the optimal crystal growth conditions required for the emulsion crystallization of hydrogenated castor oil (HCO) into several crystal morphologies. The best possible crystal shape is furthermore identified in case high rheology modifying performance is required. HCO was crystallized in a meso- and micro-continuous process which allowed for a controlled and fast screening of several crystal morphologies at different crystallization conditions. Applying high isothermal temperatures (above 55 °C) resulted in a combination of rosettes, thick fibers and thin fibers. At lower isothermal temperatures (below 55 °C) the shape gradually evolved to a combination of short needles, spherically shaped and/or irregularly shaped crystals. Crystals with the highest aspect ratio were obtained when crystals were grown between 30 °C and 45 °C and were subsequently reheated above 63 °C, forming high amounts of large thin fibrous crystals. When diluted to 0.25 wt% these fibrous crystals increased the low shear viscosity far better compared to the other crystal shapes.

 

Graphical abstract

 

The present paper discusses the optimal crystal growth conditions required for the emulsion crystallization of hydrogenated castor oil (HCO) into several crystal morphologies, furthermore the best possible crystal shape was identified in case high rheology modifying performance is required.

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