Abstract
The efficiency of Turkish sepiolite in bleaching degummed rapeseed oil has been investigated. Experimental results indicate that the bleaching efficiency is more dependent on the ratio of sepiolite to oil than on operating parameters such as contact time and temperature. An increase in the sepiolite dosage reduces the color bodies of the rapeseed oil. Its effect on oxidation state, however, is complex and related to both primary and secondary oxidation products. The removal of impurities such as chlorophyll a, β-carotene, and phosphorus increases with increasing sepiolite dosage and reaches a maxumum at 1.5% sepiolite addition and 100°C bleaching temperature. Chlorophyll a, β-carotene, and phosphorus adsorptions can be described by a mechanism involving surface are and porosity of acid-activated sepiolite as key variables. The sorption is also independent of the polarity of the adsorbate molecules. Direct comparison of activated sepiolite with the commercial bleaching earth Tonsil 210 FF shows that in some respects sepiolite offers significant advantages.
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References
Liew, K.Y., S.H. Tan, F. Morsingh, and L.E. Khoo, Adsorption of β-Carotene: II. On Cation Exchanged Bleaching Clays, J. Am. Oil Chem. Soc. 59:480–484 (1982).
Morgan, D.A., D.B. Shaw, M.J. Sidebottom, T.C. Soon, and R.S. Taylor, The Function of Bleaching Earths in the Processing of Palm, Palm Kernel and Coconut Oils, 62:292–299 (1985).
Christidis, G.E., and S. Kosiari, Decolorization of Vegetable Oils: A Study of the Mechanism of Adsorption of β-Carotene by an Acid-Activated Bentonite from Cyprus, Clays Clay Miner. 51:327–333 (2003).
Brauner, K., and A. Preisinger, Struktur und Entstehung des Sepioliths, Mineral. Petrogr. Mitt. 6:120–140 (1956).
Alvarez, A., Sepiolite: Properties and Uses, in Developments in Sedimentology 37, edited by A. Singer and E. Galan, Elsevier, Amsterdam, 1984, pp. 253–285.
Gonzalez-Pradas, E., M. Villafranca-Sanchez, and M. Socias-Viciana, Adsorption of Thiram from Aqueous Solution on Activated Carbon and Sepiolite, J. Chem. Technol. Biotechnol. 39:19–27 (1987).
Fujivara, I., and M. Sato, Adsorption of Water Vapor on Sepiolite for Chemical Heat Pumps, J. Chem. Eng. Jpn 5:609–611 (1992).
Bernal, M.P., and J.M. Lopez-Real, Natural Zeolites and Sepiolite as Ammonium and Ammonia Adsorbent Materials, Bioresource Technol. 43:27–33 (1993).
Rytwo, G., S. Nir, B. Margulies, B. Casal, J. Merino, E. Ruiz-Hitzky, and J.M. Serratosa, Adsorption of Monovalent Organic Cations on Sepiolite; Experimental Results and Model Calculations, Clays Clay Miner. 46:340–348 (1998).
Sabah, E., and M.S. Çelik, Interaction of Pyridine Derivatives with Sepiolite, J. Colloid Interface Sci. 251:33–38 (2002).
Singer, A., and P.M. Huang, Adsorption of Humic Acid by Palygorskite and Sepiolite, Clay Miner. 24:561–564 (1989).
Delacaillerie, J.B.D., V. Gruver, and J.J. Fripial, Modification of the Surface Properties of Natural Phyllosilicate Sepiolite by Secondary Isomorphic Substitution, J. Catal. 151:420–430 (1995).
Rossi, M., M. Gianazza, C. Alamprese, and F. Stanga, The Role of Bleaching Clays and Synthetic Silica in Palm Oil Physical Refining, Food Chem. 82:291–296 (2003).
European Standard EN 1097-3, Test for Mechanical and Physical Properties of Aggregates-Part 3: Determination of Loose Bulk Density and Voids, German Version (1998).
German Standard Method DGF C-V 2(81), Säurezahl, Abteilung C—Fette, German Society for Fat Science (DGF; Deutsche Gesellschaft für Fettwissenschaft) (2004).
AOCS, Official Methods and Recommended Practices of the AOCS, 5th edn., AOCS Press, Champaign, 1997.
German Standard Method DGF C-VI 6e(84), Anisidinzahl, Abteilung C—Fette, German Society for Fat Science (DGF; Deutsche Gesellschaft für Fettwissenschaft) (2004).
ÖHMI-Method L 004-13, Bestimmung von Carotin, ÖHMI Engineering, Magdeburg, Germany.
German Standard Method DGF C-VI 4(61), Phosphatide, Abteilung C—Fette, German Society for Fat Science (DGF; Deutsche Gesellschaft für Fettwissenschaft) (2004).
Süd-Chemie AG, Content of Free Fatty Acids (FFA Content)—Colour Values—Degree of Oxidation All About Tonsil® Bleaching Earths, http://www.sud-chemie.com/scmcms/web/content.jsp?nodeId=4238&lang=en (accessed January 2005).
Wiedermann, L.H., Degumming, Refining and Bleaching Soybean Oil, J. Am. Oil Chem. Soc. 58:159–166 (1981).
Taylor, D.R., D.B. Jenkins, and C.B. Ungermann, Bleaching with Alternative Layered Minerals: A Comparison with Acid-Activated Montmorillonite for Bleaching Soybean Oil, 66:334–341 (1989).
Taylor, D.R., C.B. Ungermann, and Z. Demidowicz, The Adsorption of Fatty Acids from Vegetable Oils with Zeolites and Bleaching Clay/Zeolite Blends, 61:1372–1379 (1984).
Rich, A.D., Some Basic Factors in the Bleaching of Fatty Oils, 41:315–321 (1964).
Nkpa, N.N., T.A. Arowolo, and H.J. Akpan, Quality of Nigerian Palm Oil After Bleaching with Local Treated Clays, 66:218–222 (1989).
Boki, K., M. Kubo, T. Wada, and T. Tamura, Bleaching of Alkali-Refined Vegetable Oils with Clay Minerals, 69:232–236 (1992).
Radojevic, M., V. Jovic, and D. Vitorovic, Study of Sepiolite from Goleš (Kosovo, Yugoslavia). I. Sorption Capacity, J. Serb. Chem. Soc. 67:489–497 (2002).
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Sabah, E., Çelik, M.S. Sepiolite: An effective bleaching adsorbent for the physical refining of degummed rapeseed oil. J Amer Oil Chem Soc 82, 911–916 (2005). https://doi.org/10.1007/s11746-005-1164-4
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DOI: https://doi.org/10.1007/s11746-005-1164-4