Recovery of group VIII transition metals from organic solutions using acidic ion-exchange resins
AssigneeArco Chemical Technology, L.P.
InventorsRangasamy Pitchai, Thomas S. Zak, Kurt E. Soring
Life of this patent
Estimating the term…
Abstract
A process for recovering a Group VIII metal from an organic solution is disclosed. The organic solution is contacted with an acidic ion exchange resin that has sulfonic acid active groups. The invention provides an effective and economical way to recover valuable transition metals from dilute organic solutions.
Claims16
A rhodium-recovery process which comprises contacting a solution of a rhodium hydridocarbonyl complex in an organic solvent with an acidic ion-exchange resin that has sulfonic acid active groups, separating the resin from the treated solution, and recovering the rhodium complex from the resin.
A catalyst-recovery process which comprises:
- (a) hydroformylating an organic solution containing allyl alcohol in the presence of a rhodium hydridocarbonyl complex catalyst to produce 4-hydroxybutanal;
- (b) extracting 4-hydroxybutanal from the organic solution with water;
- (c) recovering the catalyst from the organic solution by contacting the solution with an acidic ion-exchange resin that has sulfonic acid active groups;
- (d) separating the resin from the treated solution;
- and
- (e) recovering the rhodium complex from the resin.
A rhodium-recovery process which comprises contacting a solution of HRh(CO)(PPh.sub.3).sub.3 catalyst in an organic solvent selected from the group consisting of aromatic and aliphatic hydrocrbons, halogenated aromatic and aliphatic hydrocarbons, ethers, and mixtures thereof, with an acidic ion-exchange resin that has sulfonic acid active groups, a surface area within the range of about 40 m.sup.2 /g to about 100 m.sup.2 g and an average pore radius within the range of about 200 angstroms to about 300 angstroms, separating the resin from the treated solution, and recovering the catalyst from the resin.
The process of claim 18 wherein the acidic ion-exchange resin is "Amberlyst 15" resin.
Dependencies are inferred from the claim text.