Granular alkali metal nitrilotriacetate

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 3/33 (2006.01) B01J 2/00 (2006.01) C11D 3/08 (2006.01) C11D 17/06 (2006.01)

Patent

CA 2177607

There is disclosed a process for preparing highly absorptive granular alkali metal nitrilotriacetate by contacting NTA powder with an aqueous alkali metal silicate solution. A granular product having a majority of the granules, by weight, in the -12 to +80 mesh size range, which have a density of at least about 0.60 g/cc and an absorptivity in the absorptivity test in the range of above 7 ml/100 g is produced by cotacting alkali metal nitrilotriacetate with an alkali metal silicate solution, mixing the material to granulate it and then drying the granules. A granular product having a density of at least about 0.60 g/cc, fewer than 15 % fine material and an absorptivity in the range of from about 7-20 ml/100 g is produced.

L'invention concerne un procédé de préparation de nitrilotriacétate de métal alcalin granulaire à pouvoir d'absorption élevé par mise en contact d'une poudre NTA avec une dose d'acide partiellement neutralisante. On obtient un produit granulaire dont la majorité des granules présente, en poids, un calibre de -12 à +80 et une densité d'au moins 0,60 g/cc ainsi qu'une absorptivité dans l'essai d'absorptivité de l'ordre de plus de 7 ml/100 g, en mettant ledit nitrilotriacétate de métal alcalin en contact avec de l'acide, en mélangeant ladite substance de manière à la granuler et à sécher les granules. On obtient ainsi un produit granulaire présentant une densité d'au moins 0,60 g/cc, moins de 15 % de fines et une absorptivité de l'ordre d'environ 7-20 ml/100 g.

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