A process for preparing (per)fluorohalogenethers having general formula (II):

RCF2OCFA-CAF2  (II)

wherein:—

    • A and A, equal to or different from each other, are H, Cl or Br but they cannot be both H; R has the following meanings: RO—, wherein R is a (per)fluorinated substituent, selected from the following groups: linear or branched C1-C20 alkyl; C3-C7 cycloalkyl; aromatic, C6-C10 arylalkyl or alkylaryl; C5-C10 heterocyclic or alkylheterocyclic; or a perfluoropolyether substituent T-Rf— wherein T=—OCF2OCFA-CAF2, —OCF2XI, wherein XI=F, CF3, Cl; Rf is a perfluorooxyalkylene chain; by reaction of carbonyl compounds having formula R"COF (III) wherein R"=RO—, or R"=Q-Rf— wherein Q=—OCOF, —OCF2XI; in liquid phase with elemental fluorine and with olefinic compounds having formula CAF=CAF (IV), at temperatures from -120 C. to -20 C.
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