Separation and recovery of ionic substances by fluorine-containing compound
AssigneesDainippon Ink and Chemicals, Inc., Kawamura Institute of Chemical Research
InventorYutaka Hashimoto
Life of this patent
Estimating the term…
Abstract
A method for separating an ionic substance from a liquid medium, which comprises including a metal ion, a metal oxide ion, a metal complex ion, ammonium compounds, etc. dissolved or dispersed in the liquid medium by using a fluorine containing compound of the following formula [{Rf-(A).sub.a -Y}(X).sub.b ].sub.n (Z).sub.c containing a fluoroalkyl group (Rf) having 3 to 20 carbon atoms and a group (Y) having affinity for the ionic substances. A composition for trapping ionic substances, comprising the aforesaid fluorine-containing compound as a main ingredient. The invention can be advantageously applied to the recovery of useful metals from ocean waters.
Claims15
A method for recovering a cationic substance selected from the group consisting of metal ions, metal oxide ions, complex ions, amino acids and ammonium compounds, which comprises adding a water-insoluble organic solvent solution of a fluorine-containing compound containing both a fluoroalkyl group and a group having affinity for the cationic substance in its molecular structure and represented by the following general formula (I)
- ({Rf-(A).sub.a -Y}(X).sub.b).sub.n (Z).sub.c (I)
- wherein
- Rf is a fluoroalkyl group having 3 to 20 carbon atoms, A is a polyvalent linking group having a valence of 2, 3 or 4, selected from the group consisting of an etheric oxygen atom, an etheric sulfur atom, a carbonyl group, a sulfonyl group, a tertiary nitrogen atom, a carbonamido group, a sulfonamide group, --CH.sub.2 --.sub.p where p is an integer of 1 to 5, ##STR148## wherein p is an integer of 1 to 5, ##STR149## --CH.sub.2 CH.sub.2 N<, --CH.sub.2 CH.sub.2 S--, --CH.sub.2 CH.sub.2 SO.sub.2 N<, --CH.sub.2 CH.sub.2 CON<, ##STR150## Y is a group having a valence of 1, 2 or 3 and alone or together with the group A has affinity for the cationic substance, and the functional group constituting Y is at least one member selected from the group consisting of a sulfonyl group, sulfonamido group, a carbonyl group, carbonamido group, a carbonyl ester group, amino group, hydroxyl group, a urethane linkage, a urea linkage and an ether linkage,
- X is an aliphatic or aromatic group having a valence of 1 which bonds to A or Y and which does not hinder the interaction of said compound with the cationic substance,
- Z is a polyvalent linking group having a valence of 2 or 3 which links two or three groups ({R.sub.f -(A).sub.a -Y}(X).sub.b) by bonding to A or Y in the two or three group ({R.sub.f -(A).sub.a -Y}(X).sub.b),
- a, b and c are 0 or 1 and are determined independently from each other,
- n is an integer of 1 to 3, and when n is 1, c is zero, to a liquid medium in which the cationic substance is dissolved or dispersed, and separating the cationic substance from the liquid medium by including it in an ionophore formed by the fluorine containing compound.
Dependencies are inferred from the claim text.