Use of an inorganic salt or acid in reducing the hardness and/or alkalinity of a water system
US10889518B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Jul 11, 2017 |
| Grant date | Jan 12, 2021 |
| Priority date | — |
| Expiry date | Dec 12, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F2103/023
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The present invention provides a use of an inorganic salt or acid capable of producing free phosphate or fluoride ion in reducing the hardness and/or alkalinity of a water system containing residual antiscalant. In the lab test, it is found that the addition of a suitable amount of sodium phosphate or sodium fluoride may induce alkalinity reduction as well as hardness reduction. The production efficiency can be enhanced since the scaling was relieved and heat exchange efficiency can be improved. Meanwhile, lower scaling stress also means lower antiscalant dosage and cost, and thus the total operation cost can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.