Abstract
Methods for recovering oil from spent bleaching earth are described. Blowing steam and circulating hot water through spent bleaching earth reduce its oil content to only ca. 25% and 20%, respectively. Mixing the cake with milled oilseed may spoil the fresh oil. Hexane extraction of spent earth with hexane is economically feasible for expensive and relatively stable oils only. Because of its simplicity and low cost, extraction with an aqueous solution of soda and salt is economically feasible. The problems with respect to the disposal of the extracted material are discussed.
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Ong, J.T.L. Oil recovery from spent bleaching earth and disposal of the extracted material. J Am Oil Chem Soc 60, 314–315 (1983). https://doi.org/10.1007/BF02543510
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DOI: https://doi.org/10.1007/BF02543510