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Title:
PRODUCTION OF FLUOROCARBONCARBOXYLIC ACID
Document Type and Number:
Japanese Patent JPS6461443
Kind Code:
A
Abstract:

PURPOSE: To obtain the aimed high-purity compound at a low cost, by hydrolyzing a fluorocarboxylic acid chloride, then adding a KOH circulating solution, adding an alkaline metal hydroxide, etc., to the resultant salt, recirculating the obtained solution as a circulating solution and decomposing the above- mentioned salt with an acid.

CONSTITUTION: A fluorocarboxylic acid chloride production formula I (Rf is 1W10C saturated or unsaturated perfluoroalkyl; m is 1 or 2) is hydrolyzed with water and a KOH circulation solution is added to neutralize the hydrolyzate solution. The neutralized solution is subsequently concentrated and cooled to deposit and separate a salt expressed by formula II. An alkaline (earth) metal hydroxide, such as NaOH or Ca(OH)2, is added to the separated solution to separate the deposited fluoride. KOH is then added to the solution after separating the deposited fluoride and recirculated as the KOH circulating solution. The obtained salt expressed by formula II is then decomposed with an acid, such as sulfuric acid, to recover the obtained fluorocarboxylic acid by distillation, etc. Thereby the aimed high-purity compound, expressed by formula III and useful as a raw material for various organic compounds is obtained.


Inventors:
ARAMAKI MINORU
SAKAGUCHI HIROAKI
NAKAMURA TAMIO
Application Number:
JP21519787A
Publication Date:
March 08, 1989
Filing Date:
August 31, 1987
Export Citation:
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Assignee:
CENTRAL GLASS CO LTD
International Classes:
C07C53/15; C07C51/00; C07C51/02; C07C51/04; C07C53/18; C07C53/21; C07C57/52; C07C67/00; (IPC1-7): C07C51/02; C07C51/04; C07C53/15; C07C57/52
Domestic Patent References:
JP39026709A
Attorney, Agent or Firm:
Eiichi Sakamoto