4-ammonium-alkylpiperidin-1-yloxy salt synthesis via H2O2 and CO2
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Solution Overview
Problem
Conventional processes for synthesizing 4-ammonium-alkylpiperidin-1-yloxy salts are cumbersome, require excessive resources, and introduce unwanted ions, leading to high salt loads in electrolyte solutions, which are undesirable for optimal solubility and use in charge storage devices.
Innovation Solution
A process involving the reaction of 4-alkylammonium salt of 2,2,6,6-tetramethylpiperidine with H2O2 in an aqueous CO2 solution, minimizing salt introduction by using CO2 as a catalyst, allowing for efficient removal of H2O2 and reducing salt load, thereby simplifying the production of aqueous electrolyte solutions suitable for charge storage units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-step synthesis is used (alkylation with alkyl halide followed by oxidation), then 4-ammonium alkylpiperidin-1-yloxy salts can be produced, but the process becomes complex and introduces excessive foreign ions increasing salt load
Solution Approach 1:
The patent combines the alkylation and oxidation steps into a single reaction step by using H2O2 as both the oxidizing agent and a source of oxygen for the formation of the N-O bond. This merging of steps eliminates the need for separate alkylation and oxidation processes, reducing process complexity and minimizing the introduction of foreign ions.
Solution Approach 2:
The patent changes the reaction parameters by using H2O2 in aqueous solution instead of conventional alkyl halides and separate oxidizing agents. This parameter change allows the reaction to proceed in water, eliminating organic solvents and reducing salt load, while the decomposition of H2O2 into H2O and O2 minimizes foreign ion introduction.
2Reliability
If conventional oxidation with H2O2 and sodium tungstate is used, then the amino group is converted to NO· radical, but precipitates form complicating reprocessing
Solution Approach 1:
The patent removes sodium tungstate and other conventional oxidizing agents from the reaction system, replacing them with H2O2 alone. This extraction of problematic substances eliminates the formation of precipitates that complicate reprocessing, while H2O2 decomposes cleanly into H2O and O2.
Solution Approach 2:
The patent converts the potential harm of H2O2 decomposition into a benefit by allowing it to decompose into H2O and O2, which are environmentally friendly and do not form precipitates. This converts what could be a harmful byproduct issue into a beneficial clean decomposition process.
3Productivity
If high concentration of H2O2 is used for oxidation, then the reaction proceeds efficiently, but resource consumption increases
Solution Approach 1:
The patent uses H2O2 in controlled amounts, adding it gradually to the reaction mixture rather than using excessive amounts at once. This partial action approach maintains high reaction efficiency while minimizing overall H2O2 consumption and resource waste.
Solution Approach 2:
The patent maintains continuous oxidation by adding H2O2 gradually throughout the reaction process, ensuring the oxidation to NO· radical continues efficiently without requiring large batches of H2O2, thus reducing overall resource consumption.
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 results in a simpler process with reduced salt load, higher solubility of the target compounds, and efficient resource utilization, making the resulting electrolyte solutions more suitable for charge storage applications without the need for complex filtration steps.
Implementation Method 1
The 4-ammonium alkylpiperidinyl salt is converted to the 4-ammonium alkylpiperidin-1-yloxy salt by oxidation with a per compound such as H2O2
Implementation Method 2
4-Aminopiperidines with H2O2 in a CO2-containing aqueous solution are reacted
Data Source
AI summary
The present invention relates to a process for preparing aqueous solutions of 4-ammonium-alkylpiperidine-1-yloxyl salts. In said process, the educt, a 4-alkylammonium salt of the 2,2,6,6-tetramethylpiperidine, is reacted with H2O2 in an aqueous solution containing CO2. The process according to the invention is characterized by the economical use of the educts. The solutions obtained by this process are also particularly suitable for use in charge storage units, since the content of interfering foreign ions in the solutions can be minimized by the process according to the invention.