CONCENTRATED AQUEOUS IRON CHELATE COMPOSITION

摘要

The invention relates to a concentrated aqueous iron chelate composition containing at least 0.7 wt % of iron, in a molar ratio of iron to chelate of about 1:1, and containing an additive selected from the group consisting of alkali metal, protonated alkali metal, and ammonium salts of carbonate CO32-, phosphate P043-, diphosphate P2O74-, triphosphate P3O105-, phosphite HPO32-, hypophosphite H2PO2-, tetraborate B4O72-, disulfite S2O52-, thiosulfate S2O32-, and iminodiacetate HNCH2CO222-, in a molar ratio of additive to iron of from 0.1:1 to 2.5:1. Most preferably, the additive is sodium carbonate. The invention further relates to a process for preparing said composition and to the use of said composition for the removal of NOx from a gas stream. Typically, the invention compositions have an increased, high content of iron and are stable for prolonged periods of time.