Production of spherical shaped products of subliming substances

Details Production of spherical shaped products of subliming substances Production of spherical shaped products of subliming substances

1991-08-30

1995-08-01

Zimmerman, John

Chemistry: physical processes

Physical processes

Crystallization

23313R, 264 13, 423500, B01D 900, C01B 714

Patent

active

054376912

ABSTRACT:
A method for the production of spherically shaped granules of low melting point, corrosive, subliming substances which comprises melting the substance and discharging the melt through a perforated bottom receiver and into a prilling tower in the form of a plurality of streams having diameters of 0.5 to 4.0 mm which form droplets as they fall through the tower. The prilling tower has 10 to 20 mm diameter lateral perforations through each of which a mixture of air and an atomized liquid, with a lower boiling point than the melting point of the subliming substance, is introduced to form a mist. The mist is cooled below the atmospheric temperature and transformed into a low temperature fog which minimizes sublimination. The droplets are solidified as they pass through the fog during their fall through the tower and form granules having a diameter of 0.5 to 4.0 mm which are received on a curved screen to prevent breakage.

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