C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
6/210
C09C 1/24 (2006.01)
Patent
CA 1089156
TITLE OF THE INVENTION "PROCESS FOR THE PREPARATION OF YELLOW IRON HYDROXIDE PIGMENT" ABSTRACT OF THE DISCLOSURE This invention describes a process for pro- ducing iron hydroxide pigment FeO(OH), of a yellow colour, in acicular shape with average dimensions of the needles of the order of 0.12 x 0.7 microns, by the simultaneous reduction, by these ferrous salts of aromatic nitro compounds to aromatic amines. The invention is characterized in that (a) ferrous sul- phate, aqueous ammonia and an aromatic nitro compound, with a molar ratio between NH4OH and FeSO4 of less than 1:1 and with a molar ratio between NH4OH and NO2-groups equivalent to or less than 6:1 are brought in contact in a first at 20-70°C, such as to form a suspension of nuclei of FeO(OH) not exceeding 80 g/l; (b) in a second stage, an aqueous solution of FeSO4, an aromatic nitro compound and the pigment nuclei of the first stage, at 20-70°C, are mixed with a maximum of 2.0-2.5 moles of aqueous ammonia per mole of FeSO4, the molar ratio between NH4OH and NO2-groups being equal or less than 12:1, such as to form a suspension of FeO(OH) pigment not exceeding 120 g/l; (c) the pigment and the aromatic amine are recovered from the reaction product.
289898
Paolinelli Antonio
Pellizzon Tullio
Piccolo Luigi
Euteco S.p.a.
Kirby Eades Gale Baker
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