In general, the anhydrous compound<unk>  is more common industrially than its aqueous solution, hydrofluoric acid. Its main uses, on a tonnage basis, are as a precursor to organofluorine compounds and a precursor to cryolite for the electrolysis of aluminium. Precursor to organofluorine compounds<unk>  reacts with chlorocarbons to give fluorocarbons. An important application of this reaction is the production of tetrafluoroethylene (TFE), precursor to Teflon. Chloroform is fluorinated by<unk>  to produce chlorodifluoromethane (R-22): :CHCl3 + 2<unk>  → CHClF2 + 2 HCl Pyrolysis of chlorodifluoromethane (at 550-750 °C) yields TFE.<unk>  is a reactive solvent in the electrochemical fluorination of organic compounds. In this approach,<unk>  is oxidized in the presence of a hydrocarbon and the<unk>  replaces C–H bonds with C–F bonds. Perfluorinated carboxylic acids and sulfonic acids are produced in this way. 1,1-Difluoroethane is produced by adding<unk>  to acetylene using mercury as a catalyst. :HC≡CH + 2<unk>  → CH3CHF2 The intermediate in this process is vinyl<unk>  or fluoroethylene, the monomeric precursor to polyvinyl<unk> . Precursor to metal<unk> s and<unk>  The electrowinning of aluminium relies on the electrolysis of aluminium<unk>  in molten cryolite. Several kilograms of<unk>  are consumed per ton of Al produced. Other metal<unk> s are produced using<unk> , including uranium hexafluoride.<unk>  is the precursor to elemental<unk> , F2, by electrolysis of a solution of<unk>  and potassium bifluoride. The potassium bifluoride is needed because anhydrous<unk>  does not conduct electricity. Several thousand tons of F2 are produced annually. Catalyst<unk>  serves as a catalyst in alkylation processes in refineries. It is used in the majority of the installed linear alkyl benzene production facilities in the world. The process involves dehydrogenation of n-paraffins to olefins, and subsequent reaction with benzene using<unk>  as catalyst. For example, in oil refineries "alkylate", a component of high-octane petrol (gasoline), is generated in alkylation units, which combine C3 and C4 olefins and iso-butane. Solvent<unk>  is an excellent solvent. Reflecting the ability of<unk>  to participate in hydrogen bonding, even proteins and carbohydrates dissolve in<unk>  and can be recovered from it. In contrast, most non-fluoride inorganic chemicals react with<unk>  rather than dissolving.
Hydrogen fluoride
Vinyl chloride
Triphenylchloroethylene
Tetrachlorodecaoxide
Triphenylbromoethylene
Hydrogen selenide
Heptachlor
Bromine monochloride