Volume No. 11 Issue No.: 3 Page No.: 582-589 January-March 2017
SOLVENT-FREE CRYSTALLIZATION OF A VEGETABLE OIL BASED FATTY ACID FRACTION IN A VIBROMIX REACTOR
Poessnecker J., Eckert K., Dasgupta S.* and Ay P.
Mineral Processing Unit, Brandenburg University of Technology, Cottbus- Senftenberg (GERMANY)
Received on : December 1, 2016
The potential of the Vibromix technique applied in melt crystallization of a fatty acid mixture was analyzed. The effects of disk speed as well as cooling rate and crystallization temperature on crystal growth were investigated using FBRM (Focused Beam Reflectance Measurement) and polarized light microscopy. The Vibromix reactor was found to create larger crystals than a conventional blade impeller reactor. Crystal sizes of 500µm approximately were obtained using the Vibromix reactor, while the blade impeller reactor created a crystalline slurry. Increasing the disk speed of the Vibromix device lead to significant breakage of crystals. A metastable zone ranging from 17°C to 22°C approximately was observed using the Vibromix reactor. The applied cooling rates showed no significant impact on the size of primary crystals. As for further growth of the primary crystals, very slow cooling rates were necessary.
Keywords : Vibromix, Melt crystallization, Poly-unsaturated fatty acid mixture, FBRM