PROCEDE DE PRODUCTION DE FLUORURE D'HYDROGENE

• Main Author: CURTIS W. CANNON ET ROBERT N. HALL
• Format: Patent
• Language: French
• Published: 21.08.1981
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

L'INVENTION CONCERNE UN PROCEDE DE PRODUCTION DE FLUORURE D'HYDROGENE.LE PROCEDE CONSISTE A FAIRE ENTRER UNE MATIERE PREMIERE RENFERMANT DES FLUORURES ET DES PHOSPHATES EN CONTACT AVEC DE L'ACIDE FLUOROSULFONIQUE POUR LIBERER LE FLUORURE D'HYDROGENE ET DES COMPOSES PHOSPHORES VOLATILS, A SEPARER LE FLUORURE D'HYDROGENE ET LESDITS COMPOSES DE L'ACIDE FLUORO-SULFONIQUE EN EXCES ET DE LA MATIERE RESIDUAIRE ET A SEPARER LE FLUORURE D'HYDROGENE DESDITS COMPOSES PHOSPHORES VOLATILS, PUIS A LE RECUEILLIR.LE PROCEDE DE L'INVENTION PERMET DE TRAITER DES SUBSTANCES MINERALES TELLES QUE LE SPATH FLUOR, LA FLUORAPATITE, ETC. An improved method for producing hydrogen fluoride from fluoride bearing ores, such as fluorospar and fluorapatite, by reaction of the ore as a slurry in fluorosulfonic acid. The slurry is heated by the exothermic heat of the reaction to vaporize volatile phosphorous compounds and substantial quantities of hydrogen fluoride. The calcium fluoride is substantially reacted to form hydrogen fluoride. High silica fluorospar ores can be used since silicon tetrafluoride is not formed with fluorosulfonic acid. Another feature provides for addition of calcium fluoride to the slurry to react with the by-product sulfuric acid in the residual solids to eliminate the sulfuric acid recovery step in the process. Hydrogen fluoride produced is recovered, together with the hydrogen fluoride produced from the hydrolysis or pyrolysis of the intermediate fluorophosphorous compounds. Additionally, at least a portion of the hydrogen fluoride can be reacted with sulfur trioxide to form fluorosulfonic acid for makeup in the process.