METHOD OF REMOVING HYDROGEN FLUORIDE CONTAINED IN HYDROGEN CHLORIDE

摘要

PURPOSE:To reduce HF in HCl to = an allowable value as an impurity by a simple operation, bringing a HF-containing HCl gas into contact with an ionic hydroxyl group-containing compound solution suspending alkali aluminate powder. CONSTITUTION:A HCl gas containing about 20-30ppm HF, produced as a by-product during production of trichlorotrifuluoroethane, etc. is introduced to and brought into contact with a reagent for removal of HF, comprising a suspension obtained by suspending 0.03-1.4wt% alkali aluminate (e.g., NaAlO2) powder in 9-98wt% nonionic hydroxyl group-containing compound solution consisting of 1-5C mono- - polyhydric alcohol (e.g., ethanol, or glycerin), so that HF in HCl is reduced to 2-3ppm.