Patent ID: 8435411

Claim:
A method of removing impurities from an organic salt solution, the method comprising: providing an impurity-loaded organic salt solution comprising oxalate; and intermixing the impurity-loaded organic salt solution with a stripping solution to form a biphasic mixture, wherein the intermixing is effective to reduce a concentration of oxalate in the impurity-loaded organic salt solution, thereby removing impurities from the organic salt solution and forming an impurity reduced organic salt solution phase and a primarily stripping solution phase, wherein organic salt present in the impurity-loaded organic salt solution comprises: a cation selected from the group consisting of phosphonium, ammonium, sulfonium, pyridinium, pyridazinium, pyrimidinium, pyrazinium, pyrazolium, imidazolium, thiazolium, oxazolium, pyrrolidinium, quinolinium, isoquinolinium, guanidinium, piperidinium and methylmorpholinium; and an anion selected from the group consisting of fluoride, chloride, bromide, iodide, hydroxyl, alkylsulfate, dialkylphosphate, sulfate, nitrate, phosphate, sulfite, phosphite, nitrite, hypochlorite, chlorite, chlorate, perchlorate, carbonate, bicarbonate, carboxylate, bis(trifluoromethylsulfonyl)imide ([NTF 2 ] − ), tetrafluoroborate, and hexafluorophosphate.