Patent ID: 7186394
Filing Date: 2007-03-06
Classification: C01D

Abstract:
1. A process of making a high purity brine from a salt source contaminated with sulfate ions and alkaline (earth) metal ions other than sodium, wherein said process comprises dissolving said salt source in water in the presence of at least a low and high molecular weight retarding agent, wherein said retarding agent comprises at least one low molecular weight compound and at least one high molecular weight compound, wherein (I) said at least one low molecular weight retarding agent is selected from the group consisting essentially of alkylbeazene sulfonates, whereof the alkyl groups can be linear or branched, phosphate that an water-soluble, ethnylated compounds with one or more sulfite, sulfonate, sulfate, phosphite, phosphonate, phosphate, and/or carboxylgroups, and C (II) said at least one high molecular weight retarding agent is selected from the group consisting essentially of lignosulfates, phospholipids, and polyacrylates.