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US 5,684,210 AGranted
Method of purifying fluoromethyl-1,1,1,3,3,3, hexafluoroisopropyl ether
AssigneeCentral Glass Company, Limited
InventorsToshikazu Kawai, Takaaki Yoshimura, Mineo Watanabe, Manami Kumakura
Life of this patent
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Abstract
It is possible to obtain fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether which has a high purity and in which an impurity making the purification by distillation difficult has been removed, by contacting a crude fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether with a Bronsted acid(s), a Lewis acid(s) or an acid(s) fixed to a resin or the like.
Claims5
A method of purifying a crude fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether containing a fluorinated ether by-product, said method comprising the sequential steps of:
- (1) treating said crude fluoromethyl-1,1,1,3,3,3,-hexafluoroisopropyl ether with at least one member selected from the group consisting of a Bronsted acid, a Lewis acid and an acid fixed to a resin;
- (2) treating a mixture obtained by the step (1) with an alkaline aqueous solution;
- and
- (3) distilling fluoromethyl-1,1,1,1,3,3,3,-hexafluoroisopropyl ether from a mixture obtained by the step (2).
1 more element
Dependencies are inferred from the claim text.