Solvay & Cie (Societe Anonyme)

Solvay (Societe Anonyme)

Solvay Sa

Claude Breton

Leon Ninane

Thoi-Dai Chau

Joffrey Piet

Constant Guerdon

A process for the production of sodium carbonate and sodium bicarbonate out of trona, comprising crushing trona ore and dissolving it in a leaching tank containing a solution comprising sodium carbonate and sodium bicarbonate, and an additive selected from the group consisting of: phosphates, phospholipids, carboxylates, carboxilic acids, and combinations thereof, saturated in sodium bicarbonate, in order to produce solid particles suspended in a production solution comprising sodium carbonate, the solid particles containing insoluble impurities and at least 65% by weight of sodium bicarbonate. The solid particles are separated from the production solution containing sodium carbonate. At least part of the production solution containing sodium carbonate is taken out of the leaching tank.

Process for the joint production of sodium carbonate and sodium bicarbonate

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.

Installation and process for the crystallization of an inorganic

Process for the manufacture of sodium bicarbonate particles having an ovoid or spherical shape, the process preparing an aqueous solution of sodium bicarbonate, which is supersaturated; circulating the aqueous solution supersaturated in sodium bicarbonate through a bed of crystals in order to cause the bed to be a mobile bed in which the crystals are in continuous motion, and to cause crystallization of the sodium bicarbonate particles and at least partial desupersaturation of the aqueous solution supersaturated in sodium bicarbonate to provide a mother liquor and, withdrawing the sodium bicarbonate particles from the bed.

Process for the crystallization of sodium bicarbonate

Process for the production of salt in which sodium chloride is crystallized in the form of spheres by evaporation of a sodium chloride brine and the spheres obtained are then broken up. The salt produced by the process is particularly suitable for the food industry.

Salt having a translucent and glassy appearance

Process for the production of salt

Process for the production of a water-insoluble nitrogeneous organic base, from an aqueous solution of alkali metal bicarbonate and the base hydrochloride, according to which the solution (11) is treated with a complement of the base hydrochloride (12), and the resultant liquid (18) is treated with a basic agent (30) capable of decomposing the hydrochloride. The invention is applied to the regeneration of the amine in the process for the manufacture of sodium bicarbonate by the amines method.

Process for the production of a water-insoluble nitrogenous organic

An organic solution (2) of a water-immiscible chloride of an organic cation is mixed with a basic reagent and with water (3) in a reaction chamber (1), the mixture (6) which has reacted is transferred into a phase separation chamber (5) where the organic solution of the base (8) and an aqueous phase (7) containing a solid residue are separated and at least a part of a sludge (9) formed between the organic solution and the aqueous phase which have separated is recycled into the reaction chamber (1).

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Dombasle-sur-Meurthe, France

Claude Breton