Assertion: hydrogen fluoride's impurity | /r/CapableOf | comprise hexavalent sulfur compounds
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text: In a process for the purification of anhydrous hydrogen fluoride from the reaction between sulfuric acid and fluorspar comprising eflecting said reaction to produce free gaseous hydrogen fluoride, absorbing said hydrogen fluoride gas in an aqueous acid solution, heating said solution containing the absorbed hydrogen fluoride gas to distill said gaseous hydrogen fluoride containing impurities comprising water vapor, pentavalent phosphorus compounds and hexavalent sulfur compounds and contacting said hydrogen fluoride gas with a scrubbing liquid consisting essentially of liquid hydrogen fluoride, the improvement comprising continually adding liquid water to said scrubbing liquid to maintain the water concentration between 1 part by weight water to 9 parts by weight hydrogen fluoride and 1 part by weight water to 500 parts by weight hydrogen fluoride whereby to retain said phosphorus and said sulfur in said scrubbing liquid and to reduce the phosphorus content and the sulfur content of said gaseous hydrogen fluoride and to recover substantially pure anhydrous hydrogen fluoride.