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 sample operation, by bringing a HF-containing HCl gas into contact with a silane (derivative) containing a nonionic hydroxyl group-containing compound. CONSTITUTION:A HCl gas containing about 20-30ppm HF, produced as a by-product during production of trichlorotrifluoroethane, is introduced to and brought into contact with reagent for removal of HF, comprising 9-96wt% nonionic hydroxyl group-containing compound such as 1-5C mono- - polyfunctional alcohol (e.g., ethanol, or glycerin), and if necessary, 0.03-5wt% chlorinated hydrocarbon (e.g., CHCl3), chlorosilane (e.g., SiHCl3), or chlorosilane derivative (e.g., phenyltrichlorosilane), so that HF in HCl is reduced to 2-3ppm.