Process for the crystallization of an inorganic substance
US6478828B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1994 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Dec 19, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B7/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for crystallization of an inorganic substance includes preparing a supersaturated solution of the inorganic substance to be crystallized in a solvent which is a liquid; forcing a stream of the supersaturated solution upwardly through successively a fluidized bed distributor of a fluidized bed reactor and a bed of crystals arranged above the fluidized bed distributor with a pressure effective to cause fluidization of the bed of crystals, the fluidized bed distributor dividing the stream of supersaturated solution into thin, substantially parallel and vertical jets; maintaining the fluidized bed distributor at a temperature which is uniform and at which the inorganic substance to be crystallized from the supersaturated solution is lower than or equal to the concentration corresponding to saturation; and controlling the temperature of the fluidized bed distributor to cause the stream of supersaturated solution in the fluidized bed distributor to undergo a temperature change which is insufficient to desupersaturate it completely.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.