Process for purifying hydrogen fluoride

Verfahren zum Reinigen von Flusssäure

Procédé de purification d'acide fluorhydrique

Abstract

A process for preparing hydrogen fluoride involving treating anhydrous hydrogen fluoride containing primarily trivalent arsenic impurities with an effective amount of chromium (VI) oxide (i.e.,         CrO₃ ) and oxygen such as to oxidize substantially all of the trivalent arsenic to pentavalent arsenic (i.e., As + ³ ---> As + ⁵) followed by separation and recovery (e.g., by distillation) of purified anhydrous hydrogen fluoride.

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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    EP-0027607-A1April 29, 1981Riedel-De Haen AktiengesellschaftVerfahren zur Herstellung einer gereinigten oxidationsbeständigen anorganischen Säure
    FR-1335675-AAugust 23, 1963I C P M Ind Chimiche Porto MarProcédé pour l'élimination de composés d'arsenic et d'antimoine de l'acide fluorhdrique moyennant la formation de complexes, facilement séparables, entre l'arsenic et l'antimoine, le fluor et un métal alcalin
    US-4032621-AJune 28, 1977E. I. Du Pont De Nemours And CompanyPreparation of hydrogen fluoride with low levels of arsenic, iron and sulfite

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    EP-1028087-A1August 16, 2000Bayer AgVerfahren zum Herstellen reiner Flusssäure
    KR-101287547-B1July 19, 2013포항공과대학교 산학협력단Method for removal of hexavalent chromium and trivalent arsenic
    US-6346227-B1February 12, 2002Bayer AktiengesellschaftProcess for preparing pure hydrofluoric acid