| 摘要 |
Inorganic fluorides are prepared by contacting controlled amounts of F2 and a co-reactant whose vapour is combustible in F2, and which is an element or a fluoride of an element containing less fluorine than is desired in the product in a reactor in which the interior surface of the reactor surrounding the inlet for the vapour of the co-reactant is formed of an alkali metal, alkaline earth metal, or Cd fluoride having a boiling-point above the temperature to which it is exposed by the combustion of the co-reactant in F2. Examples of co-reactants are S, Br, I, Cl, Hg, P, Na, K, Sb and their lower fluorides. The controlled amounts of reactants are within /sB5% by weight of the theoretical amounts for the desired product. Apparatus for making SF6 illustrated in a Figure (not shown), consists of a waterjacketed reactor whose walls are of Ni-Cu alloy and in which co-reactant feed pipe enters at the bottom of the reaction chamber through a supporting shell having a side open to the reaction chamber and containing powdered CaF2. The main stream of the product is cooled, scrubbed with 10-20% aq. KOH, dried (H2SO4) and liquefied by compression but a small fraction is diverted to a redox potential analyser which controls the motorized sulphur feed valve.ALSO:The bottom interior surface of a water-jacketed reactor constructed of Ni-Cn alloy and resistant to fluorine is formed of an alkali metal, alkaline earth metal or Cd fluoride. An inlet in said surface comprises a sapphire tube mounted in an alumina block. |
