Ethylenediaminetetraacetic Acid → EDTA disodium salt

Participants

Reaction Conditions

Reaction Steps

Ammonium zirconium carbonate (AZC) having the formula (NH4)2 [Zr(OH)2 (CO3)2 ] was dissolved in water in an amount sufficient to produce a 0.2 molar solution. With the solution at between about 50°-80° C., disodium salt of EDTA was added to the solution in an amount sufficient to produce a one to one molar ratio between disodium salt of EDTA and the AZC. Disodium salt of EDTA was prepared by reacting reagent grade EDTA obtained from Baker Chemical Co. with sodium carbonate. The resulting chelated solution was strongly alkaline. The chelated solution was then heated to a temperature of about 100° C. and maintained at that temperature for approximately 2 days to produce a solid residue in the form of white flakes or powder. Upon testing, the white flakes were found to be readily soluble in water. The flakes were then calcined at 600° C. for 6 hours to produce metal oxide particles having Na2CO3 as an impurity mixed therewith. The Na2CO3 was then removed by washing with distilled water to obtain ZrO containing an impurity of about 0.3 mole % Na2O. The resultant metal oxide powder was comprised of metal oxide particles having a mean diameter of approximately 250 angstroms and a uniform size distribution. The particles were generally spherical and substantially unagglomerated as shown by the SEM in FIG. 1.

Provenance & Evidence