Mineral oils: apparatus – Solvent extraction
Patent
1995-01-18
1997-05-20
Bhat, Nina
Mineral oils: apparatus
Solvent extraction
196106, 196112, 196115, 196138, 202117, 202173, 159 62, 159 162, 159 163, B01D 1100, C10C 118
Patent
active
056309112
ABSTRACT:
An apparatus for separating a solvent from solid or granular particles. The apparatus includes a fully enclosed vessel having multiple stages for effecting the solvent removal therein. Each stage includes an upper deck and a lower deck extending across the width of the vessel generally parallel to one another over a substantial portion of the length of the vessel. A first gear and a second gear are operatively located beyond the ends of the upper and lower decks. A means for conveying solid particles forms a continuous loop extending from the first gear over the lower deck, around the second gear and over the upper deck and back to the first gear. Drive means are provided for rotating the means for conveying solids. The lower deck is heated to a sufficient temperature to cause vaporization of at least a portion of the solvent contaminating the solid particles as the particles are conveyed over the heated deck. The means for conveying solids moves the solids through the apparatus so that the solids first to enter are the first to exit the apparatus to minimize residence time, reduce grinding or breaking of the solids, and minimize the likelihood that solid particles will be burned or stick to the apparatus.
REFERENCES:
patent: 4260457 (1981-04-01), Barns
patent: 4315815 (1982-02-01), Gearhart
patent: 4770747 (1988-09-01), Muller
patent: 5076895 (1991-12-01), Greenfield et al.
Bhat Nina
Crown Iron Works Company
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