Method for reducing concentration of hydrofluoroether-olefin

By reacting HFEO with alcohol, chlorine, or hydrogen and subsequent distillation, the method addresses the challenge of separating HFEO from HFE, achieving a high-purity hydrofluoroether suitable for heat transfer applications.

WO2025164448A1 Publication Date: 2025-08-07AGC INC
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Patent Information

Application Number
PCT/JP2025/001797
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-01-31
Filing Date
2025-01-21
Publication Date
2025-08-07

AI Technical Summary

Technical Problem

Conventional methods struggle to effectively reduce the concentration of hydrofluoroether olefins (HFEO) in mixtures with hydrofluoroether (HFE) due to similar boiling points, leading to corrosion of equipment and difficulty in separation.

Method used

A method involving the reaction of hydrofluoroether olefins with compounds like alcohol, chlorine, or hydrogen to convert HFEO into other compounds, followed by distillation to separate and remove the converted products, ensuring a high-purity hydrofluoroether composition.

Benefits of technology

Effectively reduces HFEO concentration to less than 0.1 mol%, producing a high-purity hydrofluoroether suitable for use as a heat transfer medium without equipment corrosion.

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Abstract

Provided is a method for effectively reducing the concentration of a hydrofluoroether-olefin (HFEO) contained in a mixture comprising a hydrofluoroether (HFE) and the HFEO. This method for reducing the concentration of an HFEO is one in which the HFE is a compound (A) represented by formula (1) and the HFEO is a compound (B) represented by formula (2), the method comprising reacting the compound (B) contained in the mixture with a compound (C) which is any of an alcohol, chlorine, and hydrogen.　(1): R2-O-R1-O-R3 (2): R2-O-R1-O-R4 In formulae (1) and (2), R1 is a C1-C4 alkylene group, R2 and R3 are each independently a C2-C4 fluoroalkyl group, and R4 is a C2-C4 fluoroalkenyl group.
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