| abstract |
The present invention relates to a method of preparing anhydrous hydrogen fluoride by using sodium aluminum tetrafluoride and a reaction device for the same. More specifically, the present invention relates to a method of preparing anhydrous hydrogen fluoride by mixing and pulverizing sodium aluminum tetrafluoride (NaAlF 4 ) as a fluoride source with sulfuric acid in a preliminary reactor to obtain gaseous anhydrous hydrogen fluoride (HF) and solid-state material, and treating the obtained solid-state material with heat in a main reactor to obtain gaseous anhydrous hydrogen fluoride and solid sodium aluminum sulfate (NaAl(SO 4 ) 2 ), and a reaction device for the same. According to the present invention, as a fluoride source for preparing anhydrous hydrogen fluoride, an NaAlF 4 byproduct of monosilane production can be reused instead of expensive fluorspar (CaF 2 ), which is very economical and friendly to the environment. In addition, the production yield of HF can be remarkably improved since a generation of bulky solids is suppressed by uniformly dispersing the viscous reaction intermediate of calcium hydrogen sulfate (Ca(HSO 4 ) 2 ) and the reactants are pulverized finely. |