Patent ID: 9227864
Filing Date: 2016-01-05
CPC Classification: C02F

Claim Text:
1. A method of preventing mineral scale and deposition within a cooling tower, the cooling tower containing cooling water contained therein, the method comprising: adding to the cooling water each of phosphonobutane tricarboxylic acid (PBCT), a polyacrylic acid species (PAS), polymaleic acid (PM), and softened water, individually, or in a combination of admixtures, so as to form treated cooling water, the weight % ratio of PBCT to PM being from about 1:1.5 to about 1:3 and the weight % ratio of PAS to PM being from about 1:2 to about 1:4; and maintaining a level of PBCT in the treated cooling water of from about 6 mg/L to about 14 mg/L; determining a calcium hardness of a makeup water as CaCO determining a total alkalinity of the makeup water as CaCO calculating an operating cycles of concentration (COC) for operation of the cooling tower according to the equation: wherein: CaH is the calcium hardness of the makeup water as CaCO operating the cooling tower at the calculated operating COC; and adding the makeup water to the cooling water to maintain the operating COC.