David A. Wilson - Richwood TX Freddie Griffin - Missouri City TX
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
C07F 1300
US Classification:
260429J
Abstract:
Ethylenediaminetetraacetic acid and the trisodium salt of N-hydroxyethylethylenediaminetriacetic acid are mixed in water at mole ratios of 80/20 to 52/48, respectively, and a manganese compound is dissolved therein with heating. The pH is adjusted to 7 and water is added to make a solution of manganese chelate which contains 6% by wt. manganese. The resulting solution has good freeze-thaw stability.
Process For The Preparation Of A Stable Salt-Free Iron Chelate For Use In Hydrogen Sulfide Abatement
Freddie Griffin - Missouri City TX David A. Wilson - Richwood TX Steven H. Christiansen - Waianae HI
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
C09K 332 C01B 2106 C01B 1702 B01J 2000
US Classification:
252189
Abstract:
A stable, salt-free iron chelate for use in aqueous alkaline systems is prepared by contacting iron oxide with an aqueous mixture of from 30 to 45 mole percent trisodium HEDTA and from 55 to 70 mole percent EDTA, heating the mixture to dissolve the iron, and adjusting the pH to from 7 to 10 with base.
Process For Making Aminopolycarboxylic Acid Chelates Of Iron
Steven L. Wallace - Lake Jackson TX Freddie Griffin - Missouri City TX Thorwald J. Tvedt - Angleton TX
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
C02F 512
US Classification:
210698
Abstract:
An improved method of treating boiler water which employs an oxygen scavenging compound and a compound to control pH together with a chelating agent, wherein the chelating agent is hydroxyethylethylenediaminetriacetic acid.
Preparation Of A Zinc Chelate Having Improved Stability
David A. Wilson - Richwood TX Druce K. Crump - Lake Jackson TX Freddie Griffin - Missouri City TX
Assignee:
The Dow Chemical Company - Midland MI
International Classification:
C07F 306
US Classification:
2604299
Abstract:
An improved process of preparing an aqueous solution of the zinc chelate of N-(2-hydroxyethyl) iminodiacetic acid wherein ammonia is added to the aqueous solution during its preparation to increase the solubility of zinc therein.