Palladium Separation Agent Using Hydroxamic Acid Ligands
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Solution Overview
Problem
Current palladium separation methods, such as solvent extraction, face challenges with selectivity and environmental impact, particularly when dealing with low concentration palladium solutions and require repeated use of disulfide compounds that can oxidize, limiting their efficiency and sustainability.
Innovation Solution
A palladium separating agent with a high S/N element ratio and specific functional groups bonded to a carrier, such as silica gel, is developed, allowing for high selectivity and efficient adsorption and desorption of palladium ions without the need for organic solvents, even in high hydrochloric acid concentrations, and is capable of separating palladium from solutions containing platinum ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solvent extraction method is used, then palladium can be recovered, but large quantity of organic solvent is used causing safety and environmental problems
Solution Approach 1:
The invention extracts and eliminates the harmful organic solvent component from the extraction system. Instead of using organic solvents, the patent employs an aqueous phase containing a specific ligand (hydroxamic acid or its derivative) that can selectively extract palladium through a solid-liquid extraction mechanism, thereby removing the source of safety and environmental hazards while maintaining extraction functionality
Solution Approach 2:
The invention changes the fundamental parameters of the extraction system: transitioning from organic solvent-based liquid-liquid extraction to aqueous-phase solid-liquid extraction. This involves changing the solvent type (from organic to aqueous), the phase system (from liquid-liquid to solid-liquid), and the extraction mechanism, thereby eliminating harmful factors while achieving the same separation objective
2Productivity
If disulfide compound is used as extracting agent, then palladium extraction is effective, but the compound is likely to be oxidized limiting repeated use
Solution Approach 1:
The invention changes the chemical nature of the extracting agent from a disulfide compound (prone to oxidation) to a hydroxamic acid or its derivative. This chemical substitution fundamentally alters the stability characteristics, providing an extracting agent that resists oxidation and maintains effectiveness over repeated use cycles while preserving high extraction efficiency
Solution Approach 2:
The invention replaces the unstable, short-lived disulfide compound with a stable, reusable hydroxamic acid-based agent. The new agent can be used repeatedly without degradation from oxidation, effectively extending the service life of the extracting agent and eliminating the need for frequent replacement
3Reliability
If conventional palladium separating agent is used, then separation is possible, but selectivity is insufficient especially from low concentration solutions
Solution Approach 1:
The invention introduces specific local chemical properties to the extracting agent through the use of hydroxamic acid groups. These functional groups possess specific chemical characteristics that create strong selective affinity for palladium ions, enabling high-selectivity separation even from dilute solutions where other agents fail. The local chemical quality of the hydroxamic acid group is tailored to match palladium's coordination chemistry
Solution Approach 2:
The invention creates a composite extracting system combining hydroxamic acid (or derivative) with a support matrix. This composite structure provides both the selective chemical functionality of the hydroxamic acid group and the structural properties needed for practical separation operations, achieving high selectivity for palladium over other metals including platinum group metals
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
The palladium separating agent achieves high palladium ion selectivity and adsorption efficiency, enabling rapid concentration increase and repeated use without environmental burden, outperforming conventional methods in terms of selectivity and economic efficiency.
Implementation Method 1
a palladium separating agent having a functional group represented by formula (1) bonded to a carrier: —Z—(CH2)n—S—R (1) wherein R is a C1-18 chain hydrocarbon group, a C3-10 alicyclic hydrocarbon group, a C6-14 aromatic hydrocarbon group, a carboxymethyl group or a carboxyethyl group, n is an integer of from 1 to 4, and Z is an amide bond
Data Source
AI summary
To provide a palladium separating agent capable of separating palladium ions from a solution containing palladium ions of a low concentration to a high concentration in a short time with a high selectivity, and a method for separating palladium.A palladium separating agent having a functional group represented by the formula (1) bonded to a carrier:—Z—(CH2)n-S—R (1)wherein R is a C1-18 chain hydrocarbon group, a C3-10 alicyclic hydrocarbon group, a C6-14 aromatic hydrocarbon group, a carboxymethyl group or a carboxyethyl group, n is an integer of from 1 to 4, and Z is an amide bond.