Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1998-02-05
1999-09-28
Langel, Wayne
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
423371, 423379, B32B 516, C01C 308
Patent
active
059585889
ABSTRACT:
A process for the direct preparation of alkali metal cyanide and alkaline earth metal cyanide granules from an HCN-containing gas and an aqueous solution or suspension of an alkali metal or alkaline earth metal hydroxide. The reaction is performed in a reactor for fluidized bed spray granulation, wherein a solution or suspension of the hydroxide is sprayed onto seed granules of the cyanide being prepared and at the same time a hydrogen cyanide-containing gas is supplied to the reactor and water is evaporated by means of a fluidizing gas. The preferred fluidizing gas is steam. The reaction gases from a BMA or Andrussow process may be quenched with water and the gas mixture used as fluidizing gas. By using a CO.sub.2 -free HCN-containing gas, alkali metal cyanide granules with advantageous properties, including a combined concentration of alkali metal carbonate and alkali metal formate of less then 0.4 wt. %, are obtainable.
REFERENCES:
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patent: 5674617 (1997-10-01), Riemenschneider
Uhlemann, Kontinuierliche Wirbelschicht-Spruhgranulation, Chem.-Ing.-Tech. 62 (1990) No. 10, pp. 822-834.
Trojosky, Rauchgasreinigung durch Absorptions-trocknung in der Wirbelschieht, Chem. Ing. Technik 9:95, p. 174.
Ullmann's Encyclopedia of Industrial Chemistry, 5th Ed. (1987) vol. A8, pp. 161-163.
Ozaki et al., "High-Purity Alkali Metal Cyanide", Chemical Abstracts, vol. 88, No. 10, (Mar. 6, 1978), XP-002064496.
Alt Hans Christian
Becker-Balfanz Catrin
Feuer Oliver
Hippel Lukas Von
Lorosch Jurgen
Degussa-Huls AG
Langel Wayne
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