METHOD FOR PREPARING HYDROBROMIC ACID FROM WASTE MADE OF AN AQUEOUS SOLUTION OF BROMIDE SALTS

摘要

The invention relates to a process for preparing hydrobromic acid from waste based on an aqueous solution of bromide salts comprising organic contaminants, said process comprising the following steps: a. a step of thermal purification by incineration of the waste in order to eliminate the organic contaminants, followed by a step of concentration of the waste by trapping in a quench consisting of a concentric circular water curtain; b. a step of electrodialysis with bipolar membranes, or of treatment with an ion exchange resin, of the waste obtained at the end of step a. to convert bromide salts to hydrobromic acid; c. a purification step by a first distillation of the hydrobromic acid obtained at the end of step b. to remove excess water and hydrochloric acid; d. a purification step by a second azeotropic distillation of the hydrobromic acid obtained at the end of step c. to reduce the content of dry residues, heavy metals and / or dissolved salts; summer. a step of recovering the hydrobromic acid obtained at the end of step d.