초록 ▼

A method and apparatus for the countercurrent contacting of solid particles with a fluid is disclosed. The contacting is effected within a multistage tower, each stage having a weir means regulating the flow of particles within and from each chamber so that all particles receive approximately the sa

A method and apparatus for the countercurrent contacting of solid particles with a fluid is disclosed. The contacting is effected within a multistage tower, each stage having a weir means regulating the flow of particles within and from each chamber so that all particles receive approximately the same exposure to the contacting fluid. The disclosed design is readily scaled up to increase capacity without requiring proportional increases in the vertical dimension which are costly and might result in damage to the particles. The method and apparatus are especially adapted for washing salt from alumina microspheres.

대표청구항 ▼

A countercurrent solids-fluid contactor comprising: a tower having means for defining a plurality of stages disposed one above the other; means in communication with the uppermost stage for introducing particulate solids; means for introducing fluid into the lowermost stage; and passage means for al

A countercurrent solids-fluid contactor comprising: a tower having means for defining a plurality of stages disposed one above the other; means in communication with the uppermost stage for introducing particulate solids; means for introducing fluid into the lowermost stage; and passage means for allowing fluid to flow upwardly between each pair of vertically adjacent stages and for allowing particles to flow downwardly between each pair of vertically adjacent stages; each said stage including recirculation means substantially independent of said passage means for drawing fluid from the upper portion of each stage and recirculating it into the bottom of the same stage in such a manner as to fluidize particles within the stage; each said stage including an associated means for keeping the quantity of particles on a given stage substantially fixed independently of the rate of particle flow from stage to stage through the passage means during operation of the contactor so that the particles receive uniform contacting.