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Supercritical carbon dioxide extraction of spent bleaching clays

✍ Scribed by Jerry W. King; Gary R. List; James H. Johnson

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
447 KB
Volume
5
Category
Article
ISSN
0896-8446

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✦ Synopsis

The disposal of spent bleaching clay generated in the vegetable oil processing industry is a potential problem of environmental concern, due to the pyrophoric nature of the residual oil/clay mixture in landfills. This study describes the use of SC-CO2 for processing both neutral and acidic clays used in the refining of soybean oil. Rapid extractions of spent bleaching clay can be affected at lO,OOO-12,000 psig by proper preparation of the clay substrate. Experiments utilizing both laboratory and pilot-plant extractors have yielded almost 100% of the adsorbed oil. Extraction of the clay can be facilitated by crossblending the clay with a diatomaceous earth-based dispersant. The oils recovered by the supercritical fluid extraction (SFE) process have properties (free fatty acid content, Lovibond color ratio, and phosphorus content) similar to those found for degummed-bleached oils.

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