Decomposition of aluminum nitrate
US4223000A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1979 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Jul 27, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is described a method for the decomposition of aluminum nitrate crystals to alumina comprising the steps of: PA1 (a) melting the aluminum nitrate crystals; PA1 (b) evaporating from the melted crystals in a once through evaporator at the boiling temperature of the mixture and for a time sufficient to remove water and associated nitric acid and to provide a fluid having an alumina concentration of at least about 18% by weight; PA1 (c) decomposing the product of step (b) at a temperature of between about 150.degree. and about 200.degree. C. and recovering the heat of condensation of the resultant vapors; PA1 (d) further decomposing the product of step (c) in a fluidized bed decomposer at a temperature of between about 300.degree. and about 400.degree. C. to reduce the residual nitrate concentration in the product to between about 5 and about 10 weight percent; PA1 (e) decomposing the product of step (d) in a fluidized bed decomposer at a temperature of between about 500.degree. and about 800.degree. C. to reduce the residual nitrate concentration in the product to below about 3 percent by weight; and PA1 (f) calcining the product of step (e) at a temperature of at least about 10…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.