Inhibition of Calcium Oxalate Scale in Aqueous Systems

Calcium oxalate scale is a common problem encountered in the bleaching sequence in pulp and paper manufacture, alcohol production and sugar evaporators. Downtime due to cleaning of the hard deposit is expensive and leads to loss of production. This study compares the activity of two maleic acid type polymers with two phosphinocarboxylic acids and a phosphonocarboxylic acid over a range of calcium oxalate saturation indices.