C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 11/02 (2006.01)
Patent
CA 2045220
A process for the production of essentially chlorine free chlorine dioxide whereby a flow of chlorine dioxide obtained from reduction of alkali metal chlorate and containing by-product of chlorine gas is absorbed in water and the chlorine gas is treated in the water solution with formic acid by addition of this to the water or to the water solution, whereby the addition of formic acid is made in addition to any existing by-product of formic acid from the chlorine dioxide production. The formic acid is added in an amount resulting in a mole ratio formic acid to chlorine gas of > 1:1.
Procédé permettant de produire du dioxyde de chlore essentiellement exempt de chlore, dans lequel un courant de dioxyde de chlore obtenu par réduction d'un chlorate de métal alcalin et contenant du chlore résiduel est absorbé dans de l'eau; le chlore est ensuite traité dans la solution aqueuse avec de l'acide formique qui est ajouté à l'eau ou à la solution aqueuse, cet acide formique étant ajouté en plus de tout autre sous-produit existant de l'acide formique provenant de la production de dioxyde de chlore. L'acide formique est ajouté en quantité telle que le rapport molaire acide formique/chlore est > 1/1.
Eka Nobel Ab
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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