Method for removing dibasic calcium hypochlorite scale
US4483842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1983 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Aug 1, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B11/064
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Dibasic calcium hypochlorite scale present on the surfaces of process equipment, e.g., process vessels, used for the manufacture of neutral calcium hypochlorite is removed chemically by controllably adding chlorine to the process liquor under conditions of agitation while maintaining the pH of the process liquor at at least 7, e.g., from about 7 to about 10.5, thereby to solubilize the dibasic calcium hypochlorite scale without producing substantial amounts of elemental chlorine. In a preferred embodiment, the process liquor in the process equipment containing the dibasic calcium hypochlorite scale is forwarded to a further process vessel containing other less alkaline process liquor to which the chlorine is controllably added. The resulting hydrochloric acid-containing process liquor is recycled to the process equipment containing the dibasic scale and this procedure continued until the desired amount of dibasic calcium hypochlorite scale is solubilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.