Patent ID: 8519184
Filing Date: 2013-08-27
Classification: C07C

Abstract:
1. A method for synthesizing a rare earth metal extractant in the form of a dialkyl diglycol amic acid having the general formula (1): wherein R 1 and R 2 are each independently alkyl, at least one being a straight or branched alkyl group of 6 to 12 carbon atoms, comprising the step of reacting diglycolic anhydride with a dialkylamine in a synthesis medium, wherein dialkylamine (B) and diglycolic anhydride (A) are present in a molar ratio (B/A) in a range of 1.0 to 1.2, and the synthesis medium is a non-polar or low-polar solvent in which the dialkyl diglycol amic acid is dissolvable and which will serve as an organic solvent to form an organic phase in subsequent solvent extraction.