Solvent-Free HFSI Synthesis via Elevated Temperature Reaction
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Solution Overview
Problem
Existing methods for preparing lithium bis(fluorosulfonyl)-imide (HFSI) require solvents, metal salts, long reaction times, and separation of HCl, making them inefficient and cumbersome, especially when using continuous reactors.
Innovation Solution
A method involving a reaction between ClSI, CSI, and chlorosulfonic acid with HF at elevated temperatures without a solvent, eliminating the need for metal salts and HCl separation, allowing for both batch and continuous processes in tube-shaped reactors with shorter reaction times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods are used for preparing HFSI, then the reaction can proceed with conventional reagents, but the reaction time is long and requires solvent and metal salts
Solution Approach 1:
The patent applies parameter changes by conducting the reaction at elevated temperatures (80-150°C) without solvent, which accelerates the reaction rate and reduces reaction time from hours to minutes while eliminating the need for metal salts and HCl separation equipment
Solution Approach 2:
The patent extracts and eliminates unnecessary components from the conventional process, specifically removing the requirement for solvents, metal salts, and HCl separation steps, thereby simplifying the overall process while maintaining high productivity
2Ease of manufacture
If existing methods are used for preparing HFSI, then the reaction can be conducted with standard reagents, but solvent and metal salts are required
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the conventional process, specifically removing the requirement for solvents, metal salts, and HCl separation steps, thereby simplifying the overall process while maintaining high productivity
Solution Approach 2:
The patent applies self-service by using a reagent combination that inherently handles the reaction without requiring additional auxiliary substances like solvents or metal salts, and the process automatically manages HCl removal through the reaction conditions themselves rather than requiring separate separation equipment
3Productivity
If existing methods are used for preparing HFSI, then the reaction can proceed conventionally, but HCl separation is required during the reaction
Solution Approach 1:
The patent extracts and eliminates the HCl separation step from the process by conducting the reaction in a solvent-free system at elevated temperatures, where HCl is naturally removed or minimized, eliminating the need for complex continuous stirred-tank reactor setups with separation devices
Solution Approach 2:
The patent uses an intermediary approach by employing a specific combination of reagents (ClSI, CSI, and chlorosulfonic acid) that facilitates the reaction proceeding without requiring separate HCl removal mechanisms, allowing simple tube-shaped reactors to achieve high yields
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 yields of HFSI with reduced reaction times and eliminates the need for solvent and metal salt usage, enhancing process efficiency and scalability.
Implementation Method 1
a reaction between ClSI, CSI, and chlorosulfonic acid with HF at elevated temperatures
Data Source
AI summary
The invention relates to a method for the preparation of bis(fluorosulfonyl)-imide and its derivatives at elevated temperature.