Method for inhibiting scale in high-cycle aqueous systems

A method of treating an aqueous system with a chemical treatment composition comprising a quad-polymer, the quad-polymer including as monomers about 3.5 mole % allyloxybenzenesulfonic acid, about 2.5 mole % methallyl sulfonic acid, about 13-18 mole % methyl methacrylate and about 76-81 mole % acrylic acid and having a molecular weight of less than about 50,000, and a phosphonate, the phosphonate being 2 phosphonobutane 1,2,4 tricarboxylic acid, the volume of the aqueous system being maintained through the addition of makeup water, comprising the steps of

• determining the composition of the makeup water;
• calculating the number of concentration cycles of the makeup water sufficient to produce a calcite saturation index of at least 100;
• operating the aqueous system at the calculated number of concentration cycles;
• monitoring the concentration of the quad-polymer in the aqueous system;
• and
• adding a sufficient quantity of the chemical treatment composition to maintain the concentration of the quad-polymer in the aqueous system within a predetermined range wherein the quad-polymer and the phosphonate are present in the chemical treatment composition in a ratio ranging from about 1:1 to about 4:1.

A method of treating an aqueous system with a chemical treatment composition comprising a quad-polymer, the quad-polymer including as monomers about 3.5 mole % allyloxybenzenesulfonic acid, about 2.5 mole % methallyl sulfonic acid, about 13-18 mole % methyl methacrylate and about 76-81 mole % acrylic acid and having a molecular weight of less than about 50,000, and a phosphonate, the phosphonate being 2 phosphonobutane 1,2,4 tricarboxylic acid, the volume of the aqueous system being maintained through the addition of makeup water, comprising the steps of:

• determining the composition of the makeup water;
• calculating the number of concentration cycles of the makeup water sufficient to produce a Mg*Si product of at least 20,000;
• operating the aqueous system at the calculated number of concentration cycles;
• monitoring the concentration of the quad-polymer in the aqueous system;
• and
• adding a sufficient quantity of the chemical treatment composition to maintain the concentration of the quad-polymer in the aqueous system within a predetermined range wherein the quad-polymer and the phosphonate are present in the chemical treatment composition in a ratio ranging from about 1:1 to about 4:1.