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US 5,690,701 AGranted
Process for the manufacture of particles of coated persalts
AssigneeSolvay Interox (Societe Anonyme)
InventorsStefano Bigini, Romano Pardini, Soraya Parvaneh
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Abstract
Continuous process for the manufacture of solid alkali metal persalt particles coated by crystallization of a supersaturated aqueous solution of persalts and covering of the persalt particles in a post-crystallization vessel into which at least one coating agent is introduced and in which crystallization of the coating agent around the persalt particles is carried out under controlled temperature and stirring conditions.
Claims10
A continuous process for the manufacture of coated particles of at least one persalt of at least one alkali metal, comprising:
- (a) continuously crystallizing a supersaturated aqueous persalt solution in a crystallizer in order to obtain a suspension of crystalline persalt particles,
- (b) transferring the suspension of crystalline persalt particles leaving the crystallizer into a stirred post-crystallization vessel,
- (c) introducing at least one coating agent selected from the group consisting of alkali metal salts of at least one inorganic acid into the said vessel, at a concentration lower than saturation,
- (d) crystallizing said coating agent on the surface of the persalt particles in the post-crystallization vessel to obtain coated crystalline persalt particles,
- (e) centrifuging the coated crystalline particles in a centrifuge, and
- (f) drying the thus centrifuged coated crystalline persalt particles in a dryer.
3 more elements
Dependencies are inferred from the claim text.