Institut Francaise Du Petrole, Des Carburants Et Lubrifiants Et

Institut Francais Du Petrole, Des Carburants & Lubrifiants

Jean-Pierre Poitevin

Claude Dezael

Philippe Renault

A sulfur dioxide containing gas is purified by successive contact with an ammonia solution and then a dilute ammonium sulfite solution; the latter solution is regenerated by electrodialysis while the ammonia solution, after SO.sub.2 absorption, is vaporized in order to recover ammonia and sulfur dioxide.

Process for purifying a sulfur dioxide containing gas

Sulfur dioxide and ammonia remaining in waste-gas after partial purification thereof, for example by means of ammonia or ammonium sulfite solutions, are withdrawn from said gas by washing with a diluted aqueous solution of ammonium sulfate; the resulting ammonium sulfite containing solution is oxidized thereafter either by means of air or in an electrochemical cell.

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Marly le roi, France

Jean-Pierre Poitevin