Patent ID: 7230142

Claim:
A process for purifying fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether, comprising: causing fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether containing at least 1,1,1,3,3,3-hexafluoroisopropyl alcohol in an amount not greater than about 0.25% by weight to contact with a basic aqueous solution which contains a basic substance in an amount providing a chemical equivalent ratio of said basic substance to 1,1,1,3,3,3-hexafluoroisopropyl alcohol being within a range of not less than 1 so as to remove the 1,1,1,3,3,3-hexafluoroisopropyl alcohol from the fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether.