Chemistry: physical processes – Physical processes – Agglomerating
Patent
1978-05-02
1981-01-13
Garris, Bradley R.
Chemistry: physical processes
Physical processes
Agglomerating
34 10, 34 15, 34 28, B01D 4300, C22B 116, F26B 308
Patent
active
042446988
ABSTRACT:
A method of drying hydrated crystalline magnesium sulfate to reduce its surface moisture content is disclosed. The method comprises: (a) fluidizing a bed of hydrated crystalline magnesium sulfate particles by continuously passing a heated gaseous medium in a generally upwardly direction through the particles at a superficial velocity at least sufficient to maintain turbulent fluidization and mixing of the particles throughout the bed; (b) transferring a dispersed form of hydrated crystalline magnesium sulfate to be dried into the fluidized bed; (c) maintaining the amount of crystalline magnesium sulfate within the fluidized bed at a constant depth; (d) controlling the temperature and relative humidity of the heated gaseous medium to maintain a bed temperature and humidity sufficient to vaporize at least a portion of the surface moisture from the hydrated crystalline magnesium sulfate without removing waters of hydration; and (e) removing dried hydrated crystalline magnesium sulfate from the bed.
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"Chem. Eng. Handbook", Perry et al., 5th Ed.; McGraw-Hill, pp. 20-67.fwdarw.20-74, 1973. _
"Ind. & Eng. Chem.", 55, pp. 18-24, Quinn, 1963. _
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Nonhebel et al., "Drying . . . ", Ch. 11-Fluidized Bed Dryers, pp. 205-220 & 295 & 296, CRC Press, 1971. _
Vanecek et al., "Fluidized Bed Drying", pp. 5-7, 16-21, 33-45, 154 & 155 & 186-191, Leonard Hill Books, 1966. _
Johnson Herbert A.
King Robert J.
Garris Bradley R.
Kuszaj J. M.
The Dow Chemical Company
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