Process for preparing granular calcium hypochlorite in a fluidized bed
US3969546A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1974 |
| Grant date | Jul 13, 1976 |
| Priority date | — |
| Expiry date | Dec 20, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Granular calcium hypochlorite particles having a core of calcium hypochlorite encapsulated in a plurality of layers of calcium hypochlorite are produced from an aqueous slurry of calcium hypochlorite by spraying a pumpable and sprayable slurry of calcium hypochlorite particles onto suspended particles of solid calcium hypochlorite above a moving bed of said particles in a fluidized bed. The solid particles coated with the slurry are heated to simultaneously evaporate and remove water from the slurry whereby said particles are coated with a layer of solid calcium hypochlorite. A portion of the moving bed of coated particles is removed from the spraying zone and further processed, if desired. In one embodiment, the coated particles with or without sizing are further dried to produce granular particles having the desired moisture content. In another embodiment, the withdrawn portion is conveyed to another spraying zone where the particles are coated with a slurry of calcium hypochlorite having a lower available chlorine content than the particles which form the core material. In another embodiment, the withdrawn portion of calcium hypochlorite particles is conveyed to another spraying…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.