Process for the extraction of fatty and oily matters from wet sludges and other substances

摘要

The wet sludge, with addition of water if necessary to make it flow easily, is emulsified with gasolene or other solvent for the matter to be extracted and which will cause the undissolved matter to float on the aqueous solution. The resulting mixture is centrifuged as in the machine described in Specification 119,288, [Class 23, Centrifugal machines &c.]. The gasolene is distilled from the extracted matter, and the water and solid matters are treated with steam to recover any contained solvent. In an example, wool-scouring liquor is allowed to stand, and the supernatant liquor is drawn off and acidified with acid or nitre cake; the semi-liquid sludge consisting of fine dirt, suspended grease, organic matters soluble in the alkali, and fatty acids from the soap is then treated as described above.