Dioxolane-Containing Hydrofluoroethers for Low GWP Thermal Stability
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Solution Overview
Problem
There is a need for inert fluorinated fluids with low global warming potential, high thermal stability, low toxicity, non-flammability, and a wide operating temperature range to meet the requirements of various applications such as heat transfer, solvent cleaning, and fire extinguishing agents.
Innovation Solution
Development of dioxolane-containing compounds with specific perfluoroalkyl and alkyl groups, which are synthesized by reacting a 1,2-diol with a perfluorinated 1-alkyl amine in the presence of a base, offering high yield and potential cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorinated fluids are used, then thermal stability and non-flammability are achieved, but global warming potential increases
Solution Approach 1:
The patent modifies the chemical structure of fluorinated compounds by introducing dioxolane rings and nitrogen-containing groups, changing the molecular parameters to reduce GWP while preserving thermal stability. Specifically, the compounds have formulas where Rf1-Rf6 are perfluoroalkyl groups with specific carbon chain lengths, creating molecules that are thermally stable but have lower atmospheric persistence and warming impact
Solution Approach 2:
The invention creates composite molecular structures combining perfluoroalkyl chains (for thermal stability) with dioxolane rings and amine groups (for reduced GWP). The compounds contain multiple functional groups working together: the perfluoroalkyl groups provide thermal resistance while the dioxolane and nitrogen groups reduce overall global warming potential
2Reliability
If fluorinated compounds are used, then non-flammability is achieved, but toxicity may increase
Solution Approach 1:
The patent applies local quality by strategically placing nitrogen-containing groups and dioxolane rings at specific positions within the molecule (indicated by R4 and R5 positions in the formula). These localized modifications reduce toxicity in specific regions of the molecule while maintaining the non-flammable perfluoroalkyl chains in other regions
3Reliability
If new fluorinated compounds are synthesized, then performance requirements are met, but manufacturing complexity increases
Solution Approach 1:
The synthesis method segments the manufacturing process into distinct stages: first forming the dioxolane ring structure, then introducing nitrogen-containing groups, and finally attaching perfluoroalkyl chains. This segmentation allows each step to be optimized independently and facilitates scale-up while meeting performance requirements
Solution Approach 2:
The patent employs parameter changes in the synthesis process by adjusting reaction conditions (temperature, pressure, catalysts) to optimize yield and purity at each manufacturing stage. The general formula allows for parameter optimization across different Rf group configurations without changing the fundamental synthesis pathway
Data Source
AI summary
Described herein is dioxolane-containing compound of formula (I) wherein (i) Rf1 and Rf2 are independently linear or branched perfluoroalkyi groups having with 1-8 carbon atoms and optionally comprise at least one catenated heteroatom, or (ii) Rf1 and Rf2 are bonded together to form a ring structure having 4-6 carbon atoms and optionally comprise one or more catenated heteroatoms; Rf2 is a linear or branched perfluoroalkyi groups having with 1-3 carbon atoms; and R4 and R5 are independently selected from H, F, Cl, a linear or branched alkyl group having 1-3 carbon atoms, optionally wherein the alkyl group comprises at least one of: fluorine, chlorine, a hydroxyl group, or a catenated heteroatom; for use in cleaning compositions, as an electrolyte solvent, as a heat transfer fluid, or a vapor phase soldering fluid. There is also provided a method of making the dioxolane-containing compound, comprising: contacting a 1,2-diol compound with a fluorinated ethylenically unsaturated compound in the presence of a base.