Cooling conditions and wax content in oil determine the morphologies adopted by crystals. At high cooling rates (K) and low temperatures of the refrigerant (Tf), nucleation temperatures are low. This induces the formation of a great number of small nuclei. However, at low K and high Tf, nucleation temperatures are high, producing a few large nuclei. The wax/oil equilibrium curve was determined; it allows the evaluation of the wax remaining in the oil after a given treatment. In addition, experiments were performed to evaluate crystal separation from oil. The increase of temperature from 10 to 25 C and the presence of soaps in the oil facilitate wax separation. These results give additional information that can improve operating conditions and make the choice of technological alternatives in wax separation easier.
This is a preview of subscription content, log in to check access.
Official and Tentative Methods, American Oil Chemists’ Society, 3rd edn., AOCS, Champaign, IL, 1981. Method Cc 11–53.
Official Method of Analysis, Association of Official Analytical Chemists, Horwitz, W., ed. 13th ed., AOAC, Washington, D.C., 1980, Method 20.053.
Wagner, H., L. Horhammer and P. Wolff. Biochem. Z. 334:175 (1961).
Official and Tentative Methods, American Oil Chemists’ Society, 3rd edn., AOCS, Champaign, IL, 1981. Method Ca 12–55.
Bianchi, G., P. Avato and F. Salami. Cereal Chem. 61:45 (1984).
Kleiman, R., F.E. Earle and I.A. Wolff. JAOCS 46:505 (1969).
Leibovitz, Z., and C. Ruckenstein, H.L.S. Ltd. Petah Tikua, Israel, Rev. Fr. Corps Gras 81:23 (1981).
Rac, M. Proceeding of 5th International Sunflower Conference, Clermont-Ferrand, France, July 1972, p. 365.
About this article
Cite this article
Rivarola, G., Añón, M.C. & Calvelo, A. Crystallization of waxes during sunflowerseed oil refining. J Am Oil Chem Soc 62, 1508–1513 (1985). https://doi.org/10.1007/BF02541904
- Equilibrium Curve
- Nucleation Temperature
- Ester Fraction
- Crystal Size Distribution