Chelating composition and method of forming
AssigneeNouryon Chemicals International B.V.
InventorsEdwin Rudolf Antony BANG, Martin HEUS, Tjerk Oedse BOONSTRA
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Abstract
This disclosure provides a chelating composition having a pH of at least about 9 and comprising: water; and the tetrasodium salt of glutamic acid N,N-diacetic acid present 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, 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.
Claims16
A chelating composition having a pH of at least about 9 measured as an about 1 wt % solution and comprising:
- water;
- and
- the tetrasodium salt of glutamic acid N,N-diacetic acid present 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,
- 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.
A method of forming a chelating composition, said method comprising the steps of:
- providing a first mixture comprising water and the tetrasodium salt of glutamic acid N,N-diacetic acid and having a pH of greater than about 10.5 measured as an about 1 wt % solution;
- providing a second mixture comprising water and the tetrasodium salt of glutamic acid N,N-diacetic acid and having a pH of less than about 7;
- and
- combining the first and second mixtures to form the chelating composition comprising the tetrasodium salt of glutamic acid N,N-diacetic acid in an amount of at least about 45 weight percent based on a total weight of the chelating composition as determined using an Fe-Total Sequestering Value;
- wherein the chelating composition has a pH of at least about 9 measured as an about 1 wt % solution and 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.