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AssigneeSolvay (Societe Anonyme)
InventorsLeon Ninane, Claude Breton
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Installation for the crystallization of an inorganic substance in a crystal slurry, by desupersaturation of a supersaturated solution, the installation comprising a crystallization chamber which has a vertical axis and is divided into a central zone (4) and an annular zone (5), a device (9, 10) designed to bring about a vertical translation of the slurry in the central zone (4) and a translation in the opposite direction in the annular zone (5), a device (8) for withdrawing slurry, comprising a tube (23, 24) which opens into one of the abovementioned zones, a member (14) for mechanical shearing of the slurry, comprising, a disc (17) carrying a ring of shearing teeth (19), and a tube (6, 31) passing through the cover (30) and serving to introduce anhydrous sodium carbonate, the tube (31) having a prolongation inside the crystallization chamber, over which prolongation a film of water is caused to circulate.
An apparatus for crystallisation of an inorganic substance in a crystal slurry, by desupersaturation of a supersaturated solution, the apparatus comprising a crystallisation chamber and a circulation device to bring about circulation of the slurry in the crystallisation chamber, the crystallisation chamber including a member for mechanical shearing of the slurry, comprising a disc provided with a ring of shearing teeth on its periphery.
An apparatus for the crystallisation of sodium carbonate monohydrate, comprising a crystallisation chamber delimited by a lateral wall, a base and a cover through which passes a tube which serves for the introduction of anhydrous sodium carbonate, and a device designed to bring about a circulation of a slurry of sodium carbonate monohydrate crystals in the crystallisation chamber, the tube having a prolongation inside the crystallisation chamber and including, in a hollow wall of the said prolongation, an annular enclosure which communicates with an inlet pipeline and a discharge pipeline for a cooling fluid.
Dependencies are inferred from the claim text.