Liquid sulfur hexafluoride (SF₆) contains carbon tetrachloride (CF₄) and air as main impurities. It is very difficult to remove these impurities by using a catalyst column or an adsorption column. In this work a new purification method SF₆ mixture based on batch distillation is proposed. Experimental study showed good purification performance, where SF₆N50 was obtained from SF₆N30 feed. In the modeling of the batch purification process of SF₂ mixture, the K-value was calculated based on the regular solution theory and a short cut method was employed. Results of simulations showed good agreement with thoes of experiments.