Bis(fluorosulfonyl) Imide Preparation via HF Injection Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for preparing bis(fluorosulfonyl)imide, such as those described in WO2009/123328 and WO 2015/012897, suffer from the formation of unwanted by-products and require significant energy input, leading to increased carbon footprint and reduced yield.
Innovation Solution
A process involving the continuous injection of hydrofluoric acid into a mechanically stirred reactor containing bis(halosulfonyl)imide, maintaining controlled temperature and concentration gradients to minimize by-product formation and enhance yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrofluoric acid is added to bis(halosulfonyl)imide under conventional conditions, then bis(fluorosulfonyl)imide is produced, but unwanted by-products are formed and yield decreases
Solution Approach 1:
The reactor is equipped with injection means and stirring means before the reaction begins. The injection means is positioned to deliver hydrofluoric acid at an optimized location within the reactor, and the stirring means is configured to create specific flow patterns. These preliminary arrangements ensure that when the reaction starts, the hydrofluoric acid is immediately and uniformly distributed throughout the bis(halosulfonyl)imide, preventing localized high concentrations that would generate by-products.
Solution Approach 2:
The injection means is strategically positioned within the reactor to deliver hydrofluoric acid at a specific location where it can be most effectively distributed. The stirring means creates localized high-velocity flow zones near the injection point that rapidly disperse the acid throughout the reaction medium. This localized action ensures uniform concentration distribution and prevents the formation of zones with excessively high HF concentration that would lead to by-product formation.
2Productivity
If hydrofluoric acid is added to bis(halosulfonyl)imide, then bis(fluorosulfonyl)imide is produced, but energy consumption increases
Solution Approach 1:
The invention optimizes several parameters: the injection rate of hydrofluoric acid is controlled to match the reaction kinetics; the stirring speed is optimized to achieve uniform distribution without excessive energy consumption; and the reactor geometry is designed to maximize heat transfer efficiency. These parameter optimizations allow the reaction to proceed at lower temperatures and with reduced energy input compared to conventional methods, while maintaining high productivity.
Solution Approach 2:
The invention replaces conventional heating and stirring systems with an optimized injection-stirring integrated system. The injection means delivers hydrofluoric acid in a manner that leverages the existing stirring flow patterns, eliminating the need for additional heating energy. The stirring means is configured to achieve uniform mixing through optimized blade geometry and rotation speed, reducing mechanical energy consumption while ensuring complete reaction.
3Productivity
If conventional mixing is used, then reaction proceeds, but concentration and temperature become non-uniform leading to by-products
Solution Approach 1:
The reactor is pre-configured with injection means positioned to deliver hydrofluoric acid at an optimized location, and stirring means configured to create specific flow patterns. These preliminary arrangements ensure that when the reaction begins, the hydrofluoric acid is immediately and uniformly distributed throughout the bis(halosulfonyl)imide, preventing localized high concentrations that would generate by-products.
Solution Approach 2:
The injection means is strategically positioned within the reactor to deliver hydrofluoric acid at a specific location where it can be most effectively distributed. The stirring means creates localized high-velocity flow zones near the injection point that rapidly disperse the acid throughout the reaction medium. This localized action ensures uniform concentration distribution and prevents the formation of zones with excessively high HF concentration that would lead to by-product formation.
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
Achieves high conversion and yield of bis(fluorosulfonyl)imide with reduced energy consumption and minimized by-products, ensuring homogeneity and stability of the reaction conditions.
Implementation Method 1
bringing said liquid phase A2 into contact with said stream A1 to produce bis(fluorosulfonyl)imide
Implementation Method 2
The present invention makes it possible to ensure a homogeneity of hydrofluoric acid concentration at any point of the reactor
Implementation Method 3
The present invention also makes it possible to ensure homogeneity of the temperature at any point of the reaction medium, and to avoid obtaining hot spots in the reactor
Data Source
AI summary
The invention relates to a process for preparing bis(fluorosulfonyl)imide, comprising the steps of: i) providing a stream A1 containing HF and a reactor containing a liquid phase A2 that contains bis(chlorosulfonyl)imide; ii) in said reactor, bringing said liquid phase A2 into contact with said stream A1 to produce bis(fluorosulfonyl)imide, said process being characterized in that said stream A1 is injected into said liquid phase A2.