Method for inhibiting scale in high-cycle aqueous systems
US6645384B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2000 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Jan 9, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/023
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A composition and an improved method for treating aqueous systems to prevent the accumulation of mineral scale and corrosion which comprises adding to the aqueous system a treatment solution comprising 2 phosphonobutane 1,2,4 tricarboxylic acid and a quad-polymer that includes four discrete monomers (specifically allyloxybenzenesulfonic acid, methallyl sulfonic acid, a copolymerizable non-ionic monomer and an olefinically unsaturated carboxylic acid monomer). The composition and method allow the use of higher cycles of concentration, including aqueous systems having calcite saturation indices (CSI) of more than 200, while inhibiting the formation of calcium carbonate, calcium phosphate, magnesium silicate, and iron scales.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.