Fluorination of Phosphonitrilic Chloride Trimer Using Ionic Liquids
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Solution Overview
Problem
Current fluorination methods for phosphonitrilic chloride trimer and its derivatives in organic small molecule solvents face challenges such as solvent volatility, azeotrope formation, and increased purification costs, which hinder the efficiency and cost-effectiveness of producing high-purity fluorophosphazene derivatives.
Innovation Solution
The method involves dissolving phosphonitrilic chloride trimer or its derivatives in an ionic liquid, adding a fluorinating agent, and controlling temperature for fluorination, followed by distillation to produce high-purity hexafluorocyclotriphosphazene or its derivatives, utilizing a non-volatile and pollution-free ionic liquid system that avoids azeotrope formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic small molecule solvent is used for fluorination, then fluorination reaction can proceed, but solvent volatility and azeotrope formation occur making purification difficult
Solution Approach 1:
The patent changes the physical state parameter of the solvent from volatile liquid (organic small molecule) to non-volatile liquid (ionic liquid). This parameter change eliminates solvent volatility and azeotrope formation, allowing simple distillation to achieve high product purity without complex purification steps
Solution Approach 2:
The ionic liquid acts as an intermediary medium that facilitates the fluorination reaction while avoiding the harmful effects of organic solvents. It provides a reaction environment that enables complete fluorination while its non-volatile nature prevents contamination of the final product
2Ease of manufacture
If organic small molecule solvent is used for fluorination, then reaction can be conducted, but solvent waste increases cost and environmental burden
Solution Approach 1:
The patent implements solvent recovery by distilling and reusing the ionic liquid after the fluorination reaction. Since ionic liquids have negligible vapor pressure, they remain in the reaction vessel while the volatile fluorinated product is distilled off, enabling complete solvent recovery and elimination of solvent waste
Solution Approach 2:
The patent replaces expensive, environmentally problematic organic solvents that must be disposed of with reusable ionic liquids. The ionic liquid serves as a durable, recoverable medium that eliminates the need for continuous solvent replacement and disposal operations
3Manufacturing precision
If multiple distillation and fractionation steps are performed, then product purity can be improved, but process complexity and cost increase
Solution Approach 1:
The patent extracts the purification function from the reaction process by using ionic liquid as the solvent medium. The non-volatile nature of ionic liquid automatically separates it from the volatile fluorinated product during simple distillation, eliminating the need for complex multi-step distillation and fractionation procedures
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 approach results in high-purity products with improved production rates and reduced costs, as the ionic liquid can be reused, simplifying the process and eliminating solvent volatility issues.
Implementation Method 1
Dissolve phosphonitrilic chloride trimer or its derivatives in ionic liquid
Implementation Method 2
add fluorinating agent and control the temperature to have fluorination
Implementation Method 3
The fluorinating agent described is one or multiple combinations of ammonium, lithium, sodium, potassium, rubidium, calcium, magnesium, aluminum, chromium, iron, cobalt, antimony, nickel, copper, zinc, titanium or rare earth fluorides
Implementation Method 4
Then distill to prepare high-purity hexafluorocyclotriphosphazene or its derivatives
Implementation Method 5
Temperature of the distillation described is 40-300° C. The optimal temperature is 10° C. higher than the boiling point of the product
Data Source
AI summary
The present invention relates to a fluorination method for phosphonitrilic chloride trimer and its derivatives including using phosphonitrilicchloride or partially substituted phosphonitrilic chloride trimer as raw material to fluorinate with fluorinating agent in an ionic liquid to replace the chlorine in chloro-cyclotriphosphazene molecule. The present invention uses non-volatile and pollution free ionic liquids as solvent, and just controls a distillation temperature to get a hexafluorocyclotriphosphazene or derivatives thereof with high-purity. It overcomes the shortcoming of the average solvent system that the solvent forms azeotrope with products. The post-process is simple. The production rate is high, and the ionic liquid can be recycled. The present invention produces products with high purity.