methanol; ammonia in benzene byproducts: NH4Cl; TaCl5 was treated with methanol in benzene in presence of excess of NH3, the NH4Cl was separated, the filtrate was evaporated under reduced pressure;; distillation under reduced pressure;;

LiCl in methanol Electrochem. Process; dry Ar-atmosphere; anodic oxidation of Ta in LiCl2 soln.; distillation;