IMPROVED METHOD FOR OBTAINING AN IRON-COMPRISING SOLUTION OF HIGH CONCENTRATION

• Main Author: PEETERS, Rudy
• Format: Patent
• Language: English; French; German
• Published: 21.09.2022
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INORGANIC CHEMISTRY; METALLURGY; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

In a first aspect, the present invention provides a hydrogen chloride removal process, comprising the steps of: i. contacting in a reactor an aqueous solution comprising one or more Fe 2+ -compounds with a fluid comprising an oxidizing agent, hydrochloric acid gas and optionally chlorine gas; and ii. oxidizing said Fe 2+ -compounds to Fe 3+ -compounds, thereby converting said fluid comprising hydrochloric acid gas to an exhaust gas comprising a reduced hydrochloric acid content. Furthermore, the invention also provides in an aqueous ferric chloride solution and/or a ferric chloride-hydrochloride solution obtainable by a process according to the first aspect of the invention and in the use thereof.