How is vanadium oxychloride removed from titanium tetrachloride?

In the context of titanium processing, vanadium oxychloride is removed from titanium tetrachloride (TiCl₄) by reacting it with mineral oil. Because vanadium oxychloride has a boiling point similar to that of TiCl₄, it cannot be easily separated through standard distillation alone. The reaction with mineral oil effectively strips the impurity from the product stream, after which the TiCl₄ is redistilled in a reflux distillation column to achieve a purity exceeding 99.9 percent.1