Abstract: An apparatus and method are disclosed for displacing a first liquid which surrounds and wets a solid, with a second liquid immiscible with the first liquid and having a substantially lower boiling point than the first liquid. The wetted solid is heated to a temperature between the boiling points of the two liquids, and the heated, wetted solid is admixed with a sufficient quantity of the second liquid to displace the first liquid from the solid, causing the second liquid to boil in the vicinity of the solid.

Abstract: A mixture of oil, mostly finely divided solids, and water (a typical example would be steel rolling mill scale mixture) is one of the feed materials for this process. Most of the water is first drawn off. Then the material is fed through a plurality of mixers, and after each mixer the entire composition is passed through a separator, herein described as a dewetting apparatus, which separates the fine solids from the oil and solvent and returns the expended solvent upstream toward the feed point. The diminished volume of material then passes through a final dewetting screen where the solids are washed by a small stream of fresh solvent and the fine solids then pass through a dryer. All expended solvent is collected and passed through a fractionating still which separates the recovered oil, for storage, and the solvent vapors pass through a condenser to a regenerated solvent storage tank. All of the expended solvent is saved and used over repeatedly.

Abstract: A mixture of solids, mostly finely divided, and oil, such as usually mixed with mill scale, and water is the feed material for this process. Most of the water is first drawn off. Then the material is fed through a plurality of mixers, and after each mixer the entire composition is passed through a separator, herein described as a dewetting apparatus, which separates the fine solids from the oil and returns the expended solvent upstream toward the feed point. The diminished volume of material then passes through a final dewetting screen where the solids are washed by a small stream of fresh solvent and the fine solids then pass through a dryer. All expended solvent is collected and passed through a fractionating still which separates the recovered oil, for storage, and the solvent vapors pass through a condenser to a regenerated solvent storage tank. All of the expended solvent is saved and used over and over.