Advertisement

Journal of the American Oil Chemists' Society

, Volume 77, Issue 11, pp 1219–1223 | Cite as

Solvent efficiency for oil extraction from spent bleaching clay

  • C. G. Lee
  • C. E. Seng
  • K. Y. Liew
Article

Abstract

Various alcohols and hydrocarbons were used as solvents to extract the residual oil in spent bleaching clay from palm oil refining. The content of oil and minor components in the spent clay was >40% by weight. The efficiencies of extraction by the polar alcohols, except for methanol, were higher but with a slower initial rate than the nonpolar hydrocarbons. The free fatty acids contents, the Totox values (anisidine value+2 x peroxide value), and the color of the alcohol-extracted oil were also higher than that by the hydrocarbons resulting in poorer quality oils. All the extracted oils, irrespective of the solvent used, have poorer quality than crude palm oil. However, for regeneration of the residual spent clay, the polar alcohols should be more suitable as more of the impurities are removed.

Key Words

Extraction fatty acids oil solvent spent bleaching clay 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Choo, Y.M., A.N. Ma, and Y. Basiron, Red Palm Oil: A Potential Source of Dietary Carotenes, Malaysia Oil Sci. Technol. 2: 54–55 (1993).Google Scholar
  2. 2.
    Wong, H.H., Quality of By-product from Chemical and Physical Refining of Palm Oil and Other Oils, J. Am. Oil Chem. Soc. 60:316–321 (1983).Google Scholar
  3. 3.
    Svensson, C., Use or Disposal of By-products and Spent Material from the Vegetable Oil Processing Industry in Europe, Ibid. 53:443–445 (1976).Google Scholar
  4. 4.
    Waston, K.S., and M. Hoefer, Use or Disposal of By-products and Spent Material from the Vegetable Oil Processing Industry in USA, Ibid. 53:447–450 (1976).Google Scholar
  5. 5.
    Ong, J.T.L., Oil Recovery from Spent Bleaching Earth and Disposal of the Extracted Material, Ibid. 60:314–315 (1983).Google Scholar
  6. 6.
    Ng, K.F., N.K. Nair, K.Y. Liew, and A.M. Noor, Surface and Pore Structure of Deoiled Acid and Heat Treated Spent Bleaching Clay, Ibid. 74:963–970 (1997).Google Scholar
  7. 7.
    James, E.M., The Refining and Bleaching of Vegetable Oils, Ibid. 35:76–83 (1958).Google Scholar
  8. 8.
    Official Methods and Recommended Practices of the American Oil Chemists’ Society, 4th edn., edited by D. Firestone, American Oil Chemists’ Society, Champaign, 1989, Methods Ba 3.38, Ca 5a.40, Cd 18.90 and Cd 8.53 (revised 1993).Google Scholar
  9. 9.
    Ng, K.F., Supercritical Carbon Dioxide Extraction of Spent Bleaching Clay from the Palm Oil Industry, M.Sc. Thesis, Universiti Sains Malaysia, Penang, Malaysia, 1996, p. 121.Google Scholar
  10. 10.
    Ayers, A.L., and J.J. Dooley, Laboratory Extraction of Cottonseed with Various Petroleum Hydrocarbons, J. Am. Oil Chem. Soc. 25:372–379 (1948).Google Scholar
  11. 11.
    Tan, B.K., and F.C.H. Oh, Malaysian Palm Oil: Chemical and Physical Characteristics, PORIM Technology, PORIM, Kuala Lumpur, Malaysia, 1981.Google Scholar
  12. 12.
    King, J.W., G.R. List, and J.H. Johnson, Supercritical Carbon Dioxide Extraction of Spent Bleaching Clays, in Proceedings of the Second International Symposium on Supercritical Fluids, edited by M.A. McHugh, The International Society for the Advancement of Supercritical Fluids, Boston, 1991, pp. 349–352.Google Scholar

Copyright information

© AOCS Press 2000

Authors and Affiliations

  1. 1.School of Chemical SciencesUniversiti Sains MalaysiaPenangMalaysia

Personalised recommendations