Trifluoroacetic acid can be prepared by oxidation of 3,3,3-trifluoropropene by potassium permanganate, or by the reaction of trichloroacetonitrile with hydrogen fluoride to generate trifluoroacetonitrile and then hydrolysis, or electrochemical fluorination of acetic acid (or acetic anhydride). Refining method: distillation and refining under a stream of nitrogen. Or add phosphorus pentoxide to reflux and distill. Further purification can be crystallized in steps followed by distillation.

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