Method for converting brines into acids and bases and products obtained

Abstract

ABSTRACT. The invention relates to a method for treating brines, which includes the steps of: subjecting a stream of brines to a pretreatment by means of membrane separation designed such as to obtain a stream of brines that are substantially free of divalent ions and a residual stream which includes an electrolytic solution; subjecting the stream of brines obtained in the preceding step to a treatment by means of electrodialysis using bipolar membranes designed such as to obtain a stream of hydrochloric acid and a stream of sodium hydroxide, as well as a stream of desalinated water. The invention also relates to a hydrochloric acid solution obtained by means of the preceding method. The invention also relates to a sodium hydroxide solution obtained by means of the preceding method.

RESUMEN. Un proceso de tratamiento de salmueras que comprende las etapas de: someter una corriente de salmueras a un pretratamiento mediante separación por membranas diseñado para obtener una corriente de salmueras sustancialmente libre de iones divalentes y una corriente residual que comprende una disolución electrolítica; someter la corriente de salmueras obtenida en la etapa anterior a un tratamiento mediante electrodiálisis con membranas bipolares diseñado para obtener una corriente de ácido clorhídrico y una corriente de hidróxido sódico, además de una corriente de agua desalinizada. Una disolución de ácido clorhídrico obtenida mediante el proceso anterior. Una disolución de hidróxido sódico obtenida mediante el proceso anterior.