Palladium Complex Preparation via Ammonia Extraction
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Solution Overview
Problem
Conventional palladium-nickel electrolytes containing ammonia pose health hazards and corrosion risks, and existing chloride-free processes face challenges in preparing palladium(II) carbonate or hydrogencarbonate complexes due to the unavailability of corresponding palladium dihydrogencarbonate or carbonate salts.
Innovation Solution
A process involving the reaction of tetraamminepalladium(II) dihydrogencarbonate or carbonate with amine ligands under conditions that allow for the removal of ammonia, enabling the preparation of high-yield, high-purity palladium(II) carbonate or hydrogencarbonate complexes suitable for electrochemical deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional palladium-nickel electrolytes containing ammonia and chloride are used, then palladium deposition can be achieved, but health hazards and corrosion of plant material occur
Solution Approach 1:
The patent removes chloride and ammonia from the electrolyte composition, extracting the harmful components while retaining palladium deposition capability through alternative complexing agents and salt formulations
Solution Approach 2:
The patent changes the chemical parameters of the electrolyte by using alternative palladium salts (sulfate, hydrogencarbonate, carbonate) and complexing agents, transforming the electrolyte composition to eliminate harmful substances while maintaining functional performance
2Object-affected harmful factors
If chloride-free processes use tetraamminepalladium(II) sulfate, then corrosion is reduced, but ammonia vapors still pose health hazards
Solution Approach 1:
The patent removes ammonia from the electrolyte system by using palladium salts that do not form ammonia-containing complexes, thereby eliminating ammonia vapor emission while maintaining palladium deposition functionality
Solution Approach 2:
The patent employs alternative palladium salts (hydrogencarbonate, carbonate) that serve as temporary, non-harmful substitutes for traditional ammonia-based complexes, eliminating the need for persistent ammonia-containing species in the electrolyte
3Ease of manufacture
If tetraamminepalladium(II) halides or sulfate are used, then water-soluble complexes are formed, but corresponding palladium dihydrogencarbonate or carbonate salts are not available for direct use
Solution Approach 1:
The patent performs preliminary synthesis of palladium dihydrogencarbonate and carbonate salts before they can be used in the electrolyte, creating the necessary starting materials through controlled chemical reactions to enable subsequent complex formation
Solution Approach 2:
The patent uses ammonia as an intermediary substance in the synthesis process, where it facilitates the formation of palladium dihydrogencarbonate and carbonate salts from palladium salts, serving as a temporary mediator that enables the creation of otherwise unavailable compounds
4Ease of operation
If ethylenediamine is used as complexing agent, then deposition potentials of palladium and nickel are brought close together, but sulfate content increases leading to shortened bath lifetime
Solution Approach 1:
The patent changes the anion composition by using hydrogencarbonate and carbonate salts instead of sulfate salts, thereby reducing the sulfate content in the electrolyte while maintaining the complexing functionality needed for proper deposition potential alignment
Solution Approach 2:
The patent discards sulfate from the electrolyte composition by using alternative palladium salts that do not introduce sulfate, thereby eliminating the harmful effect of high sulfate content on bath lifetime while recovering the essential palladium deposition functionality
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 process allows for the preparation of palladium complexes in an environmentally and economically advantageous manner, reducing health hazards and corrosion risks while extending the bath lifetime by minimizing ammonia and sulfate content.
Implementation Method 1
the corresponding tetraamminepalladium(II) dihydrogencarbonate or tetraamminepalladium(II) carbonate is reacted in solution with the amine ligand
Implementation Method 2
under conditions under which the ammonia liberated can be removed
Data Source
AI summary
The present invention relates to a process for preparing palladium complexes. In particular, the present invention relates to a process in which ammoniacal complexes of palladium (hydrogen)carbonate are converted into complexes with oligoamine ligands.