US 12,486,213 B2 · Method of purifying carboxylic acid fluoride

Abstract

An object is to prevent lowering in the yield of R—COF due to contamination by impurities and thereby to produce a high-purity product of R—COF in a stable manner. According to the present invention, provided are: a method of purifying a carboxylic acid fluoride, comprising a step of removing a hydrogen halide by bringing a carboxylic acid fluoride containing the hydrogen halide into contact with a metal fluoride; a method of producing a high-purity carboxylic acid fluoride, comprising a step of bringing a carboxylic acid fluoride containing a hydrogen halide into contact with a metal fluoride as well as a high-purity carboxylic acid fluoride obtained therefrom; and a method of using a metal fluoride as an adsorbent for a hydrogen halide in a method of removing a hydrogen halide from a carboxylic acid fluoride containing the hydrogen halide.

Claims16

Dependent claims

A method of purifying a carboxylic acid fluoride, comprising a step of removing a hydrogen halide by bringing a carboxylic acid fluoride containing the hydrogen halide into contact with a metal fluoride,

wherein the step of removing a hydrogen halide comprises passing the carboxylic acid fluoride containing the hydrogen halide through a column filled with a metal fluoride, and then distilling the carboxylic acid fluoride passed through the column, to obtain a carboxylic acid fluoride having a purity of 99.999% or more,
wherein the metal fluoride is sodium fluoride, and
wherein the carboxylic acid fluoride is at least one selected from the group consisting of difluoroacetyl fluoride (CHF2COF), trifluoroacetyl fluoride, perfluorobutyryl fluoride, and perfluoroheptanoyl fluoride.

Dependencies are inferred from the claim text.

Method of purifying carboxylic acid fluoride

Life of this patent

Method of purifying carboxylic acid fluoride

Life of this patent

Abstract

Claims16