Patent ID: 7452520

Claim:
A process for the production of a calcium bromide solution comprising the steps of: a) extracting a feed brine comprising Cl − , Br − , Ca ++ and Mg ++ countercurrently with a composite organic solvent in a first plurality of stages, thereby obtaining an extract and a depleted brine; and b) washing said extract with water to yield a product of an aqueous solution of CaBr 2 and a refluxed solvent, wherein said composite organic solvent comprises (1) an anionic extractant selected from the group consisting of primary, secondary, tertiary, and quaternary amines, and mixtures thereof having long, straight, or branched aliphatic chains (2) a cationic extractant selected from the group consisting of carboxylic acids, alkyl- or aryl-phosphoric acids, and alkyl- or aryl-sulphonic acids, and mixtures thereof having long, straight, or branched aliphatic chains and (3) a diluent-modifier selected from the group consisting of aromatic solvents having short aliphatic chains, nitro- or halo-aromatic solvents, and cycloaliphatic solvents.