Insoluble chelating compositions
AssigneeDevoe-Holbein International, N.V.
InventorsIrving W. DeVoe, Bruce E. Holbein
Life of this patent
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Abstract
The present invention relates to insoluble compositions, which are capable of removing metal (e.g. selectively) from solution (e.g. Fe.sup.3+ from a liquid nutrient medium so as to lower the Fe.sup.3+ content to less than 0.1 .mu.M); the insoluble compositions comprise: a suitable insoluble carrier and organic co-ordinating sites covalently fixed to the surface of said carrier, said co-ordinating sites being capable of chelating Fe.sup.3+, Th.sup.4+ and/or UO.sub.2.sup.2+.
Claims60
A method for treating an insoluble composition loaded with Th.sup.4+ and UO.sub.2.sup.2+ to separate Th.sup.4+ therefrom characterized in that said composition is contacted with an aqueous solution containing a suitable Th.sup.4+ chelating agent and an organic acid, said organic acid being a carboxylic acid, said solution having a pH greater than 2,
- said composition comprising a member selected from the class consisting of
- (A) an insoluble composition comprising
- (1) one or more organic chelating compounds, covalently fixed to the surface of
- (2) a suitable insoluble carrier, said organic chelating compounds possessing one or more coordinating sites, said organic chelating compounds being selected from the class consisting of microbial siderophores and
- (B) an insoluble composition comprising
- (1) one or more catechol compounds covalently fixed to the surface of
- (2) a suitable insoluble carrier, said catechol compounds being covalently fixed to the surface of said carrier at the benzene ring thereof, said catechol compounds being selected from the group consisting of unsubstituted catechol and catechol substituted on the benzene ring by one or two electrophilic substituents.
A method for treating an insoluble composition loaded with Th.sup.4+ and UO.sub.2.sup.2+ to separate Th.sup.4+ therefrom characterized in that said composition is contacted with an aqueous solution containing a suitable Th.sup.4+ chelating agent and an organic acid, said organic acid being a carboxylic acid, said solution having a pH greater than 2, said insoluble composition comprising
- (1) one or more organic chelating compounds, covalently fixed to the surface of
- (2) a suitable insoluble carrier, said organic chelating compounds possessing one or more coordinating sites, said organic chelating compounds being selected from the class consisting of microbial siderophores.
A method for treating an insoluble composition loaded with Th.sup.4+ and UO.sub.2.sup.2+ to separate Th.sup.4+ therefrom characterized in that said composition is contacted with an aqueous solution containing a suitable Th.sup.4+ chelating agent and an organic acid, said organic acid being a carboxylic acid, said solution having a pH greater than 2, said insoluble composition comprising
- (1) one or more catechol compounds covalently fixed to the surface of
- (2) a suitable insoluble carrier, said catechol compounds being covalently fixed to the surface of said carrier at the benzene ring thereof, said catechol compounds being selected from the group consisting of unsubstituted catechol and catechol substituted on the benzene ring by one or two electrophilic substituents.
Dependencies are inferred from the claim text.