Method of determining inhibitor concentrations in inhibited...

Details Method of determining inhibitor concentrations in inhibited... Method of determining inhibitor concentrations in inhibited...

G - Physics

01

N

G01N 31/22 (2006.01) G01N 31/00 (2006.01) G01N 31/02 (2006.01)

Patent

CA 2279731

The concentration of a hexamethylenetetramine-containing inhibitor in an acid pickling solution that has accumulated dissolved iron from use of the solution in pickling ferriferous material can be estimated with sufficient accuracy for practical control of the pickling process by alkalinizing a sample of the pickling solution to a pH of at least 10.8, so that any iron content of the solution precipitates from the solution, separating the precipitate from the liquid remainder of the alkalinized sample, and determining by colorimetry the concentration in the liquid remainder of formaldehyde produced by acid catalyzed hydrolysis of the hexamethylenetetramine to formaldehyde and ammonia.

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