Compositions and processes for removing, separating and concentr

Details Compositions and processes for removing, separating and concentr Compositions and processes for removing, separating and concentr

1991-08-09

1992-12-22

Garvin, Patrick P.

Catalyst, solid sorbent, or support therefor: product or process

Solid sorbent

Organic

210670, B01J 2022

Patent

active

051734702

ABSTRACT:
A method for the removal and concentration of desired ions such as Pd(II), Pt(IV), Pt(II), Pd(IV), Ru(III), Ru(II), Au(III), Os(IV), Au(I), Cu(I), Cu(II), Ag(I), and Hg(II) from a multiple ion source solution which may contain larger concentrations of other undesired ions including H.sup.+ comprises bringing the source solution into contact with a compound comprising a thiol and/or thioether aralkyl nitrogen-containing ligand covalently bonded through an organic spacer silicon grouping to a solid inorganic support. The thiol and/or thioether aralkyl nitrogen-containing ligand portion(s) of the compound has an affinity for the desired ions to form a complex thereby removing the desired ions from the source solution. The desired ions are removed from the compound by contacting the compound with a much smaller volume of a receiving solution having a greater affinity for the desired ions than does the thiol and/or thioether aralkyl nitrogen-containing ligand portion of the compound. The process is useful in removing desired or unwanted ions from Rh and Ir concentrates, acidic waste streams, multiple platinum group metal refining streams, and other industrial or environmental streams. The invention is also drawn to the thiol and/or thioether aralkyl nitrogen-containing ligands covalently bonded through a spacer grouping to a hydrophilic inorganic solid support material. The preferred aralkyl group is benzyl.

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patent: 4767670 (1988-08-01), Cox et al.
patent: 4876232 (1989-10-01), Barratt
patent: 5039419 (1991-08-01), Bradshaw et al.
patent: 5071819 (1991-12-01), Tarbet et al.

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