FIELD: chemical technology, inorganic chemistry. SUBSTANCE: method of hydrogen fluoride purification from impurities SiF4 and PF5 involves gas mixture passing through sodium fluoride at 225-275 C under pressure 50-150 mm mercury column. Purification degree of HF from SF4 is 100%, and that from PF5 - 99.3%. EFFECT: improved method of hydrogen fluoride purification.
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