Abstract
Studies were performed, over a temperature range of 100/sup 0/ to 400/sup 0/F, to evaluate the effectiveness of commonly used chemical agents for preventing precipitation of ferric hydroxide from spent treating acid. Citric acid, ethylenediaminetetraacetic acid (EDTA) and erythorbic acid were all shown to be effective iron stabilizers at temperatures up to at least 400/sup 0/F. In some cases, efficiency actually increased with elevated temperature. In contrast, acetic acid performed poorly above 125/sup 0/F. When compared on a weight basis, erythorbic acid was the most efficient agent tested, stabilizing nine times as much iron as citric acid. Unlike the other iron stabilizers, which function by complexation, erythorbic acid prevents ferric hydroxide precipitation primarily by reducing ferric (Fe(III)) iron to the ferrous (Fe(II)) form.
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