Production process

Details Production process Production process

C - Chemistry, Metallurgy

01

G

C01G 23/053 (2006.01) C09C 1/36 (2006.01)

Patent

CA 2048137

A process for the production of a suspension of nuclei has been developed in which an aqueous mixture of titanium tetrachloride, aluminium ions and hydroxyl ions is cured at at temperature of from 50° to the boiling point. The pH of the suspension before or after curing has a value of from 6.5 to 10.5. The aqueous mixture is prepared by mixing a solution of titanium tetrachoride with a solution of a base, e.g. sodium hydroxide and aluminium hydroxide. When used to nucleate hydrolysis in the "sulphate" process a large crystal size anatase pigment is produced.

Un procédé pour la production d'une suspension de germes a été mis au point dans lequel un mélange aqueux de tétrachlorure de titane, d'ions aluminium et d'ions hydroxyle est traité à une température variant de 50 degrés au point d'ébullition. Le pH de la suspension avant ou après traitement varie entre 6,5 et 10,5. Le mélange aqueux est préparé par mélange d'une solution de tétrachlorure de titane avec une solution d'une base, p.ex. de l'hydroxyde de sodium et de l'hydroxyde d'aluminium. Lorsqu'on utilise le procédé pour provoquer l'hydrolyse dans le procédé au "sulfate", un cristal de pigment d'anatase de grande taille est produit.

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