PRODUCING OXIDISED WHITE LIQUOR BY CONTACTING WITH OXYGEN CONTAINING GAS AT 110 DEGREES C OR MORE AND AT LEAST 9.2 ATMOSPHERES ABSOLUTE

摘要

White liquor from a paper making operation is passed downwardly through a contacting column 12 and is contacted by an ascending stream of oxygen containing gas. As a result, the sodium sulphide content of the white liquor is thereby oxidised to sodium sulphate. Rapid oxidation is achieved by operating the column 12 at a temperature of about 110 DEG C or higher and at a pressure of at least 9.2 atmospheres. IMAGE