| abstract |
A novel inhibitor of calcium carbonate, magnesium hydroxide and calcium sulfate hemihydrate scale comprises a mixture of a polymaleic acid or its salt, a phosphonic acid or its salt, and an iron sequestrant. From 0.1 to 100 ppm of this mixture is added to the water of a thermal or reverse osmosis desalination plant to control the formation and deposition of calcium carbonate, magnesium hydroxide and calcium sulfate hemihydrate scale. |