Method for recovering platinum group element

Patent metadata

Field	Value
Publication number	US-2025215525-A1
Application number	US-202318852640-A
Country	US
Kind code	A1
Filing date	Mar 29, 2023
Priority date	Mar 30, 2022
Publication date	Jul 3, 2025
Grant date	—

Abstract

A method for recovering a platinum group element from a solution containing a platinum group element using a capturing agent by adsorbing a platinum group element onto a capturing agent, the method including recovering a platinum group element by adsorbing a platinum group element onto a capturing agent so that a ratio of a platinum group element adsorbed in a form of a platinum group element complex in an oxidized state is 50 mol % or more among platinum group elements adsorbed onto the capturing agent.

First claim

1 . A method for recovering a platinum group element from a solution containing a platinum group element using a capturing agent by adsorbing a platinum group element onto a capturing agent, the method comprising:
recovering a platinum group element by adsorbing a platinum group element onto a capturing agent so that a ratio of a platinum group element adsorbed in a form of a platinum group element complex in an oxidized state is 50 mol % or more among platinum group elements adsorbed onto the capturing agent.

2 . The method for recovering a platinum group element according to claim 1 , wherein a platinum group element is recovered by adsorbing a platinum group element onto a capturing agent so that a ratio of the platinum group element adsorbed in a form of a platinum group element complex in a divalent or higher-valent oxidized state is 50 mol % or more among platinum group elements adsorbed onto the capturing agent.

3 . The method for recovering a platinum group element according to claim 1 , wherein a platinum group element is recovered in the presence of a complexing agent represented by General Formula (1),
C n H m N p O q X r (1)
where X is an element other than C, H, N, and O, n=1 to 13, m=1 to 18, p=0 to 4, q=0 to 4, r=0 to 4, and at least one of p and q is 1 or more.

4 . The method for recovering a platinum group element according to claim 1 , wherein the complexing agent is an ammonium salt, an amine, or an imine.

5 . The method for recovering a platinum group element according to claim 1 , wherein the solution containing a platinum group element is a solution containing a platinum group element and a polymer.

6 . The method for recovering a platinum group element according to claim 5 , wherein the solution containing a platinum group element is a solution containing a hydrogenated nitrile rubber and a platinum group element derived from a platinum group element-containing catalyst.

7 . The method for recovering a platinum group element according to claim 1 , wherein the recovering a platinum group element contained in a solution containing a platinum group element by adsorbing a platinum group element onto a capturing agent is initiated in a state in which the solution containing a platinum group element is simultaneously in contact with a metal-free oxidizing agent, a complexing agent, and a capturing agent.

8 . The method for recovering a platinum group element according to claim 1 , wherein the solution containing a platinum group element is brought simultaneously into contact with a metal-free oxidizing agent and a complexing agent, and a solution containing 50 mol % or more of the platinum group element being in a form of a platinum group element complex in an oxidized state is passed through a column filled with a capturing agent, thereby adsorbing a platinum group element onto the capturing agent.

9 . The method for recovering a platinum group element according to claim 7 , wherein the metal-free oxidizing agent is hydrogen peroxide, air, or oxygen.

10 . The method for recovering a platinum group element according to claim 8 , wherein the metal-free oxidizing agent is hydrogen peroxide, air, or oxygen.

11 . The method for recovering a platinum group element according to claim 1 , wherein the capturing agent is a surface-treated silica.

Assignees

• Zeon Corp

Inventors

• Inoue Sayaka
• Watanabe Yasuaki

Classifications

• C08C1/16

  in floc form · CPC title

• C22B3/42

  by ion-exchange extraction · CPC title

• Y02P10/20

  Recycling · CPC title

• C02F1/28

  by sorption (using ion-exchange C02F1/42; sorbent compositions B01J) · CPC title

• C08F6/08

  Removal of catalyst residues {(not used, see C08F6/02)} · CPC title