C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/143 (2006.01)
Patent
CA 2390582
The invention relates to a method for production of high purity silica sols comprising the steps: (a) adding a phos-phonic acid-based complexing agent to the silicic acid-containing solution forming complexes with metal cations present in said solution; (b) forming in said silicic acid-containing solution a precipitation containing phosphonic acid-based complexing agent and metal cations; (c) removing the precipitation from the solution; and, (d) polymerising the silicic acid in the solution to obtain a silica sol. The invention also relates to silica sols containing at least one phosphonic acid-based complexing agent.
L'invention concerne un procédé de production de sols de silice très purs, comprenant les étapes suivantes consistant: (a) à ajouter un agent complexant à base d'acide phosphonique, à une solution contenant de l'acide silicique, afin de former des complexes avec des cations métalliques présents dans ladite solution; (b) à former dans la solution contenant l'acide silicique une précipitation contenant un complexant à base d'acide phosphonique, ainsi que des cations métalliques; (c) à retirer de la solution le précipité et (d) à polymériser l'acide silicique dans la solution de manière à obtenir un sol de silice. L'invention concerne également des sols de silice contenant au moins un complexant à base d'acide phosphonique.
Larsson Kenneth Olof
Linsten Magnus Olof
Tokarz Bozena Stanislawa
Akzo Nobel N.v.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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