Process and apparatus for the production of calcium bromide by liquid-liquid extraction

描述了一种由原料盐水生产溴化钙的方法，特别是由特定的死海盐水(EB)。该方法包括以一混合有机溶剂逆流萃取此原料盐水；通过使萃取物同部分产品接触而纯化以提高Br∶Cl的比率；以水洗涤该纯化的萃取物而得到产品，即CaBr#-[2]的水溶液。该混合溶剂包括一阴离子萃取剂，诸如胺或胺的混合物；一阳离子萃取剂，诸如羧酸、磷酸或磺酸或这些酸的混合物；以及稀释剂/调节剂，它为一种有机溶剂。也描述了一种供生产溴化钙的设备，它包括：萃取装置；任选的纯化装置和洗涤装置，其中至少该装置之一有许多的级。 A process for the production of calcium bromide from feed brines, particularly from Dead Sea End Brine (EB), is described. The process comprises extracting the feed brine in countercurrent with a composite organic solvent; optionally, purifying the extract to increase the ratio Br:Cl by contacting it with a part of the product; and washing the purified extract with water to yield the product, that is an aqueous solution of CaBr2. The composite solvent comprises an anionic extractant, such as an amine or a mixture of amines; a cationic extractant, such as a carboxylic phosphoric or sulphonic acid or a mixtures of said acids; and diluent/modifier, which is an organic solvent. An apparatus for the production of calcium bromide is also described, which comprises: an extraction battery; optionally, a purification battery; and a washing battery, wherein at least one of the batteries comprises a plurality of stages.