Manufacture of calcium hypochlorite
US4397832A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1982 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Mar 24, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B11/064
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for making calcium hypochlorite from caustic soda calcium hydroxide and chlorine by feeding to a stirred reactor an aqueous solution of the total required amount of caustic soda and an aqueous suspension of up to 80% by weight of the total required amount of calcium hydroxide, passing chlorine through the mixture until a redox potential of 650 to 800 mV is reached and while continuing chlorination adding the remaining of the calcium hydroxide at such rate with respect to chlorine that redox potential gradually increases to between 850 and 950 mV. This process prevents thickening and caking which are a recognized problem with conventional batch processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.