PROCESS FOR RECRYSTALLIZING ALKALI METAL AND ALKALINE EARTH METAL TRICYANOMETHANIDES

摘要

The present invention relates to an industrially usable process forrecrystallizing alkali metaland alkaline earth metal tricyanomethanides. In the process, an alkali metalor alkaline earthmetal tricyanomethanide is initially charged in an aqueous solvent mixturehaving a boilingpoint at 1 bar of not more than 95°C, any alkali metal or alkalineearth metal halide whichprecipitates is filtered off and the solvent is distilled off to at least suchan extent that therecrystallized alkali metal or alkaline earth metal tricyanomethanideprecipitates.