REGENERATION OF HIGH-FLUORINATED CARBOXYLIC ACIDS FROM GASEOUS PHASE Russian patent published in 2002 - IPC

FIELD: chemical technology. SUBSTANCE: invention relates to a method of regeneration of high-fluorinated carboxylic acids from flows of exhausting gases. Exhausting gas is contacted with potassium carbonate-containing alkaline washing out solution with density above 1.15 g/cm³ and separation of high-fluorinated carboxylic acid salt as a separate phase since in taken concentration perfluorocarboxylic acid potassium salt is insoluble in potassium carbonate solution followed by preparing high-fluorinated carboxylic acid from its. The preferable density value of washing solution is 1.2-1.4 g/cm³. Method provides the isolation of pure high-fluorinated carboxylic acids without loss and deposit formation in the prolonged exploitation of washing column. EFFECT: improved method of regeneration. 1 ex