Process for the purification of perfluoroalkyl acids
The described process for converting PFAS mixtures into isomerically pure n-isomers addresses the challenge of achieving high purity PFAS, facilitating accurate analysis and potentially reducing toxicity risks.
WO2025061960A1 Publication Date: 2025-03-27CHIRON AS
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Patent Information
- Application Number
- PCT/EP2024/076455
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-09-20
- Filing Date
- 2024-09-20
- Publication Date
- 2025-03-27
AI Technical Summary
Technical Problem
Current methods for purifying poly- and perfluoroalkyl acids (PFAS) fail to achieve isomerically pure compounds, leading to challenges in accurate quantification and potential differences in toxicity among isomers.
Method used
A process involving the conversion of PFAS mixtures into aryl esters or ammonium salts, followed by recrystallization and subsequent hydrogenation or acidification to obtain isomerically pure n-isomers of poly- and perfluoroalkyl sulfonic acids or carboxylic acids.
Benefits of technology
This process achieves isomerically pure PFAS with chromatographic purities of at least 97%, enabling accurate analysis and potentially reducing toxicity risks associated with impure isomers.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention is directed to poly- and perfluoroalkyl sulfonic acids and poly- and perfluoroalkyl acids and processes for the purification and isolation of isomers from mixtures as well as highly pure poly- and perfluoroalkyl sulfonic acids and poly- and perfluoroalkyl acids and the corresponding uses.
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