Granular calcium hypochlorite by spray graining
US4118524A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1976 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Oct 26, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2/16
- 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. 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 articles is removed from the spraying zone and further processed, if desired. In one embodiment the coated articles, with or without sizing, are dried to produce granular particles having the desired moisture content. In another embodiment, the withdrawn portion is conveyed to another spraying zone where the articles are coated wth a slurry of calcium hypochlorite having a lower available chlorine content than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 In another embodiment, the withdrawn portion of calcium hypochlorite particles is conveyed to another spraying zone where the particles are …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.