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De-oiling contaminated bleaching clay by high-pressure extraction

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Journal of the American Oil Chemists Society

Abstract

The disposal and re-use of spent bleaching clay from the vegetable oil processing industry is a problem of growing importance.

Although today the only practical way of removal of the spent material is disposal, extraction with organic solvents is a well-known method of de-oiling contaminated bleaching clay. In our investigations we compare the extractibility of two different types of bleaching clays with CO2 as a solvent. All experiments were carried out with a high-pressure extraction plant. The extraction and separation conditions, temperature and pressure, as well as the CO2 mass flow, were varied during experiments. The aim of our investigations was a complete separation of the oil from the adsorbent. The latter should then be re-used as bleaching clay. The oil and the bleaching clay were analyzed and tested, respectively. The results show that oil of good quality can be recovered and the bleaching clay still has an activity approximately 50% of fresh clay.

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References

  1. Ullmann's Enzyklopädie der Technischen Chemie, 4th edn., Vol. 23, edited by G. Lagaly and R. Fahn, 1978, p. 311.

  2. Kaufmann, H.P.,Neuzeitliche Technologie der Fette und Fettprodukte (Modern Technology of Fats and Fat Products), Vol. 5, p. 733, Aschendorffsche Verlagsbuchhandlung, Münstere (1968).

    Google Scholar 

  3. Zschau, W.,Fette. Seifen Anstrichm. 87:506 (1985).

    Article  Google Scholar 

  4. Ong, J.T.L.,J. Am. Oil Chem. Soc. 60:266 (1983).

    Article  Google Scholar 

  5. Svensson, C.,ibid. 53:443 (1976).

    Article  Google Scholar 

  6. Quirin, K.W.,Fette. Seifen Anstrichm. 84:460 (1982).

    Article  CAS  Google Scholar 

  7. Patterson, H.B.W.,J. Am. Oil Chem. Soc. 53:339 (1976).

    Article  Google Scholar 

  8. Morgan, D.A., D.B. Shaw, M.J. Sidebottom, T.C. Soon and R.S. Taylor,Ibid. 62:292 (1985).

    Article  CAS  Google Scholar 

  9. Leitsätze für Speisefette und Speiseöle (Guidelines for Edible Fats and Oils), Bundesanzeiger No. 140a, June 9, 1987, p. 1.

  10. Ong, J.T.L.,J. Am. Oil Chem. Soc. 60:314 (1983).

    Article  CAS  Google Scholar 

  11. Weber, K.,Fette. Seifen Anstrichm. 83:543 (1981).

    Article  Google Scholar 

  12. Eggers, R.,On the Situation of Continuous Extraction of Solids by Means of Supercritical Oases, Internationial Symposium of Supercritical Fluids, Nice, 1988, p. 595.

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Authors and Affiliations

  1. Technische Universität Hamburg-Harburg, Arbeitsbereich Verfahrenstechnik II, Hamburg, Germany

    C. Waldmann & R. Eggers

Authors
  1. C. Waldmann
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  2. R. Eggers
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Cite this article

Waldmann, C., Eggers, R. De-oiling contaminated bleaching clay by high-pressure extraction. J Am Oil Chem Soc 68, 922–930 (1991). https://doi.org/10.1007/BF02657536

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  • DOI: https://doi.org/10.1007/BF02657536

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