Platinum Group Element Recovery Through Oxidative Complex Adsorption
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Solution Overview
Problem
Existing methods for recovering platinum group elements from solutions containing them, such as those used in hydrogenated nitrile rubber production, are inefficient, leading to low recovery rates and high costs due to the high value of these elements.
Innovation Solution
A method involving the use of a capturing agent to adsorb platinum group elements in an oxidized state, with a ratio of 50 mol % or more of the elements being in a platinum group element complex form, to enhance recovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complexing agent is added to complex the platinum group element-containing catalyst that has been separated from the carrier, then the platinum group element can be removed from the reaction mixture, but the recovery amount as a platinum group element is small
Solution Approach 1:
The invention changes the chemical state parameter of the platinum group element from reduced state to oxidized state through oxidation treatment. This parameter change enables the platinum group element to be selectively adsorbed onto the capturing agent, significantly improving the recovery amount while maintaining high removal rate
Solution Approach 2:
The invention introduces a capturing agent as an intermediary substance that selectively adsorbs the oxidized platinum group element complex. This intermediary enables efficient separation and recovery of the platinum group element from the reaction mixture, solving the contradiction between removal rate and recovery amount
2Productivity
If platinum group element-containing catalyst is used for hydrogenation, then hydrogenation reaction can be carried out, but the platinum group element content in the hydrogenated nitrile rubber increases causing coloring
Solution Approach 1:
The invention extracts the platinum group element from the hydrogenated nitrile rubber solution through oxidation and adsorption onto the capturing agent. This extraction removes the harmful catalyst residue while maintaining the benefits of using platinum group element-containing catalyst for efficient hydrogenation
Solution Approach 2:
The invention recovers the platinum group element from the reaction mixture through oxidation and adsorption, allowing it to be reused. This reduces the net amount of platinum group element remaining in the hydrogenated nitrile rubber, suppressing coloring while maintaining production efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly increases the capture rate and recovery rate of platinum group elements, allowing for their effective reuse and reducing the content in hydrogenated nitrile rubber, thereby suppressing coloring and maintaining mechanical strength.
Implementation Method 1
recovering a platinum group element from a solution containing a platinum group element by adsorbing the platinum group element onto a capturing agent
Implementation Method 2
the ratio of a platinum group element in the form of a platinum group element complex in an oxidized state among the platinum group elements adsorbed onto the capturing agent
Data Source
AI summary
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.