Method of forming a chelating composition

Abstract

A method of forming a chelating composition includes the steps of: providing a first mixture comprising water and a tetrasodium salt of glutamic acid N,N-diacetic acid and having a pH of greater than about 10; and acidifying the first mixture via ion exchange and/or bipolar membrane electrodialysis to reduce a pH of the chelating composition to a pH of at least about 9; wherein the chelating composition comprises the tetrasodium salt of glutamic acid N,N-diacetic acid in an amount of at least about 50 weight percent based on a total weight of the chelating composition as determined using an Fe-Total Sequestering Value; and wherein the chelating composition has a viscosity of less than about 1350 mPa·s measured at about 5° C., or less than about 350 mPa·s measured at about 20° C., each using a Brookfield DV II plus viscometer with spindle S18 and a temperature controlled bath.

Dependencies are inferred from the claim text.