METHOD OF LITHIUM HEXAFLUORARSENATE PRODUCTION Russian patent published in 2009 - IPC C01G28/00 C01D15/00 

FIELD: chemistry.

SUBSTANCE: invention can be used in production of lithium hexafluorarsenate applied in chemical current sources. Method of lithium hexafluorarsenate production includes interaction of hexafluorarsenic acid derived from aqueous solutions of high-purity arsenic and hydrofluoric acids, and lithium carbonate with water-binding agent acetic anhydride at temperature (55±5)°C in molar ration as follows: H₃AsO₄:HF:(CH₃CO)₂O:Li₂CO₃=1:(6.1÷6.5): (16÷17:(0.5÷1). Derived reaction mass is separated from lithium hexafluorarsenate industrial salt by acetic acid distillation to solid residue. Lithium hexafluorarsenate commercial-grade salt is produced with purification of industrial salt and recrystallisation from ethyl acetate. Produced high-purity lithium hexafluorarsenate contains, wt %: base material 99.98, water 0.02, trace contaminant 10^-4-10^-5.

EFFECT: extra pure lithium hexafluorarsenate salt meeting the requirements to electrolyte components of chemical current sources.

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