An object of the present invention is to provide a production method that makes it possible to produce 1,1-dibromo-1-fluoroethane easily and sustainably. The present invention provides a method for producing 1,1-dibromo-1-fluoroethane, the method comprising step A of reacting 1,1-dibromoethylene with hydrogen fluoride to obtain 1,1-dibromo-1-fluoroethane.

A process for preparing a fluorinating reagent from a calcium-containing compound is disclosed. The process bypasses the requirement to form hydrofluoric acid. The fluorinating reagent can be used to prepare high-value fluorochemicals.

An object of the present invention is to provide a method for efficiently obtaining fluoroethylene. A method for producing HFO-1132(Z/E) comprising reacting a halogenated ethylene represented by formula (1): CHX.sup.1CHX.sup.2 (1), wherein X.sup.1 and X.sup.2 are identical or different, and each represents chlorine, bromine, or iodine, with a metal fluoride. A method for producing HFO-1123, comprising reacting a halogenated ethylene represented by formula (2): CX.sup.3X.sup.4CHX.sup.5 (2), wherein X.sup.3, X.sup.4, and X.sup.5 are identical or different, and each represents chlorine, bromine, or iodine, with a metal fluoride.

Minimum-boiling, heterogeneous azeotropic and azeotrope-like compositions including 1,1,2,2,3-pentachloropropane (HCC-240aa) and hydrogen fluoride (HF), as well as methods for using these azeotropic or azeotrope-like compositions in the production of trifluorochloropropenes.