METHOD AND PLANT FOR DEPLETING SODIUM THIOCYANATE IN WASHING LIQUORS AND FOR OBTAINING PURE SODIUM THIOCYANATE

METHOD AND PLANT FOR DEPLETING SODIUM THIOCYANATE IN WASHING LIQUORS AND FOR OBTAINING PURE SODIUM THIOCYANATE

A method and apparatus are provided for depleting sodium thiocyanate (NaSCN) from washing solutions to obtain pure sodium thiocyanate. By adding an anti-solvent such as ethanol, which acts as anti-solvent for the main part of the accompanying salts in the solution, the major part of these accompanyi...

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Bibliographische Detailangaben
Hauptverfasser: HINSEN WILHELM, HOFMANN GUNTER, PLATE HERMANN, MELCHES CHRISTIAN
Format: Patent
Sprache:eng
Schlagworte:
AMMONIA
CHEMISTRY
COMPOUNDS THEREOF
CYANOGEN
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:A method and apparatus are provided for depleting sodium thiocyanate (NaSCN) from washing solutions to obtain pure sodium thiocyanate. By adding an anti-solvent such as ethanol, which acts as anti-solvent for the main part of the accompanying salts in the solution, the major part of these accompanying salts can be separated by precipitation in a crystallization and removed, for example, by filtration, whereas the NaSCN remains in the solution. After separating the anti-solvent from the remaining aqueous solution in a rectification, a very pure crystallized NaSCN is produced in a NaSCN crystallization. After washing in a counterstream washing apparatus, the obtained crystallized NaSCN product has a purity of at least 99%.