Biodegradable complexing agents for heavy metals

Details Biodegradable complexing agents for heavy metals Biodegradable complexing agents for heavy metals

C - Chemistry, Metallurgy

02

F

C02F 1/56 (2006.01) C02F 9/00 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2308191

Heavy metals such as lead, copper, zinc and cadmium can be effectively extracted from mixtures such as sludge by treatment of the mixtures with carboxyl derivatives of fructans. The fructans, such as inulin, preferably have a degree of substitution of 0.2 - 3Ø In particular a carboxymethylinulin or a dicarboxyinulin containing 0.5 - 2.0 carboxyl groups per monosaccharide unit is used.

Selon l'invention, on peut extraire des métaux lourds, tels que du plomb, du cuivre, du zinc et du cadmium, à partir de mélanges du type boues, en traitant ces mélanges avec des dérivés carboxyles de fructosanes. Ces fructosanes, comme l'inuline, possèdent, de préférence, un degré de substitution de l'ordre de 0,2 à 3,0. On utilise notamment une carboxyméthylinuline ou une dicarboxyinuline contenant 0,5 à 2,0 groupes carboxyles par unité monosaccharide.

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