| 摘要 |
A continuous, recycling, solvent extraction process for the separation and extraction of halocarbon contaminants, particularly organochlorines such as polychlorinated biphenyls from hydrophobic materials, especially hydrophobic liquids and solids such as oils and fats, comprising contacting an oleophobic perfluorocarbon (PFC) fluid, in which the halocarbon contaminant is at least partially soluble, with the contaminated hydrophobic liquid or solid by means of a recycling liquid-liquid or solid-liquid continuous extraction apparatus (10) wherein the dense PFC fluid is contacted with the contaminated hydrophobic material, the contaminants are at least partially extracted into the PFC fluid, the PFC fluid is removed from the hydrophobic material into a separate zone containing a PFC-insoluble matrix to which the contaminants preferentially adhere, the contaminant-depleted PFC fluid is removed from the matrix and reintroduced into contact with the hydrophobic material (5), thus completing the cycle which can be continuously repeated for as long as is necessary to effect removal of the contaminant to a required extent.
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