Patent ID: 8815058
Filing Date: 2014-08-26
Classification: B01D,C01B

Abstract:
1. A method of removing arsenic from phosphorous pentafluoride by extractive distillation, the method comprising: charging a phosphorous pentafluoride feed stream to an extractive distillation column, the phosphorous pentafluoride feed stream comprising phosphorous pentafluoride and arsenic pentafluoride; charging hydrogen fluoride as a separation solvent to the extractive distillation column in an amount from about 0.5 wt % to about 10 wt % based on the weight of the total charge of phosphorous pentafluoride and hydrogen fluoride to the extractive distillation column; and separating arsenic pentafluoride from the purified phosphorous pentafluoride in the extractive distillation column.