Thermal decomposition of metal nitrates
AssigneeCiba-Geigy Corporation
InventorRalph Miller
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Abstract
This invention relates to a process for the thermal decomposition of metal nitrates which decompose below a temperature of about 400.degree. C. to form the corresponding metal oxide as well as oxides of nitrogen, said process involving distributing said nitrate over previously formed oxide and conducting said decomposition under "muffle" conditions such that said decomposition occurs in an atmosphere predominantly comprised of the vapors evolved during the thermal decomposition.
Claims15
A method for thermally decomposing a metal nitrate in a liquid phase to the corresponding metal oxide and a nitrogen dioxide-containing gaseous mixture, said metal nitrate having a decomposition temperature of less than about 400.degree. C., said process comprising the steps of
- (1) introducing solid metal oxide particles coated with said metal nitrate liquid phase into a decomposition reactor, the metal of said oxide corresponding to the metal in the liquid phase;
- (2) raising the temperature of said coated particles above the decomposition temperature of said nitrate;
- (3) maintaining said coated patricles at a temperature above said decomposition temperature and in an atmosphere formed by the vapors evolved during said decomposition for a period of time sufficient to decompose said nitrate, the metal oxide decomposition product forming on and adhering to said particles;
- and
- (4) removing said metal oxide and said nitrogen dioxide-containing gaseous mixture.
A method for thermally decomposing manganous nitrate contained in a liquid phase to manganese dioxide and a nitrogen dioxide-containing gaseous mixture which comprises the steps of
- (1) introducing solid manganese dioxide particles coated with said manganous nitrate liquid phase into a decomposition reactor;
- (2) raising the temperature of said coated particles above about 180.degree. C.;
- (3) maintaining said coated particles at said temperature in excess of about 180.degree. C. and in an atmosphere formed by the vapors evolved during said decomposition for a period of time sufficient to decompose said manganous nitrate, the manganese dioxide decomposition product forming on and adhering to said manganese dioxide particles, and
- (4) removing manganese dioxide and said nitrogen dioxide-containing gaseous mixture.
Dependencies are inferred from the claim text.