초록 ▼

A method for enhancing solvent extraction of organic wastes from contaminated waste mixtures. A contaminated waste mixture is contacted with a solvent with high driving force for solvation of water, and most preferably with a solvent which is both anhydrous and which has an appreciable affinity for

A method for enhancing solvent extraction of organic wastes from contaminated waste mixtures. A contaminated waste mixture is contacted with a solvent with high driving force for solvation of water, and most preferably with a solvent which is both anhydrous and which has an appreciable affinity for solvation of water. While the solvent is in contact with the contaminated waste mixture, a portion of the organic waste is dissolved in the solvent. Then, the solvated organic waste and residual solvent is removed from the contaminated waste mixture. Solvent is recovered, preferably by distillation, and is then dehydrated, prior to repeating the cycle. The technique substantially improves the degree of removal of certain organic wastes from contaminated waste mixtures, and has been demonstrated to be particularly useful for removal of pesticides from organic waste mixtures.

대표청구항 ▼

A process for extraction of organic material from contaminated material, wherein said contaminated material comprises a mixture of solid material, water, and organic material, said method comprising the steps of: (1) mixing the contaminated material and the solvent to provide a resulting mixture of

A process for extraction of organic material from contaminated material, wherein said contaminated material comprises a mixture of solid material, water, and organic material, said method comprising the steps of: (1) mixing the contaminated material and the solvent to provide a resulting mixture of solvent and contaminated material at a preselected temperature; (2a) dissolving a portion of said organic material in said solvent, to thereby at least partially decontaminate said contaminated material; (2b) adding water to said mixture of said solvent and contaminated material in an amount effective to cause said solid material to settle; (3) separating said solvent from said solid material; (4) wherein, prior to or during the step of mixing said solvent with said contaminated material, the temperature of said solvent is adjusted to said preselected temperature, said preselected temperature being above the inverse critical solution temperature of said solvent for water, if said inverse critical solution temperature exists, and (5) and wherein, during mixing of said solvent with said contaminated material, the actual amount of water in said solvent at the preselected mixing temperature is maintained approximately 1.5% by weight below the capacity of the solvent for water, (6) so that organic material is effectively removed from said contaminated material.