Palladium Recovery via Cloud Point Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for palladium recovery, such as hydrometallurgical and solvent extraction processes, face limitations in selectivity, environmental sustainability, and economic viability due to the use of non-selective leaching agents, high volatile organic solvent consumption, and low metal extraction capacities of solid adsorbents.
Innovation Solution
A method involving the formation of a palladium complex with a beta-dithiocarbonyl compound in a dispersion with a non-ionic surfactant, which undergoes cloud point extraction to separate the hydrophobic complex, allowing for efficient recovery of palladium from aqueous solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydrometallurgical methods are used for palladium recovery, then metal extraction is achieved, but selectivity is poor and environmental sustainability deteriorates due to non-selective leaching agents
Solution Approach 1:
The patent introduces a beta-dithiocarbonyl compound as an intermediary reagent that selectively complexes with palladium ions to form a hydrophobic complex. This intermediary enables selective extraction of palladium from aqueous solutions containing multiple metal ions, resolving the contradiction between extraction capacity and selectivity while avoiding environmentally harmful leaching agents
Solution Approach 2:
The patent changes the chemical parameters by using a beta-dithiocarbonyl compound that forms a hydrophobic complex with palladium, altering the solubility characteristics of the metal complex. This parameter change enables selective partitioning into the organic phase, achieving both high extraction efficiency and environmental sustainability
2Object-affected harmful factors
If solvent extraction methods are used for palladium recovery, then selectivity is improved, but economic viability deteriorates due to high volatile organic solvent consumption
Solution Approach 1:
The patent utilizes phase transition principles by forming a hydrophobic complex that naturally partitions into the organic phase. The beta-dithiocarbonyl compound transforms the hydrophilic palladium ions into a hydrophobic complex, enabling spontaneous phase separation and reducing the need for large volumes of volatile organic solvents, thus improving economic viability while maintaining selectivity
3Object-affected harmful factors
If solid adsorbents are used for metal recovery, then environmental impact is reduced, but metal extraction capacity deteriorates due to low extraction efficiency
Solution Approach 1:
The patent employs a composite approach by combining a beta-dithiocarbonyl compound (organic reagent) with an aqueous solution to form a selective complexing system. This composite chemical system achieves both high extraction capacity and environmental sustainability by using non-toxic reagents that selectively bind palladium, overcoming the limitations of solid adsorbents
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 achieves high-yield palladium recovery with reduced environmental impact and economic costs by utilizing a beta-dithiocarbonyl compound to form a hydrophobic complex that can be easily separated, overcoming the limitations of existing methods.
Implementation Method 1
a method for the quantitative recovery of palladium(II) from aqueous solutions by cloud point extraction (CPE) where a compound bearing a beta-dithiocarbonyl group is used to form a hydrophobic complex of palladium which is extracted from the aqueous solution by the use of a suitable non-ionic surfactant
Data Source
AI summary
The present invention relates to a method for the recovery of palladium from an aqueous solution, comprising the steps of: (A) providing a dispersion comprising an aqueous dispersing phase comprising palladium(II), at least one non-ionic surfactant and at least one compound bearing a beta-dithiocarbonyl group, so as to form a hydrophobic complex of palladium(II) with the compound bearing a beta-dithiocarbonyl group; (B) heating the dispersion resulting from step (A) to a temperature at least equal to its cloud point so as to obtain the phase separation between the aqueous dispersing phase and a dispersed phase rich in surfactant comprising at least a part of said hydrophobic complex; (C) separating the dispersed phase rich in surfactant from the aqueous dispersing phase resulting from step (B); and (D) recovering the hydrophobic complex of palladium(II) with the compound bearing a beta-dithiocarbonyl group.