Production manner null of full orca - Bonn

摘要

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 1-10C 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.