Improving the generation of active polysulphide

C - Chemistry – Metallurgy – 01 – B

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C01B 17/20 (2006.01) C07B 33/00 (2006.01)

Patent

CA 2573399

Polysulphide produced by oxidizing white liquor includes both active and inactive components. "Active" polysulphide is the only component that increases pulp yield. The amount of active polysulphide formed when manganese oxides are used as catalysts in the generating process is increased by adding a co-catalyst. Adding bismuth compounds and, in particular, bismuth oxide as a co-catalyst increases the total amount of polysulphide formed with all the manganese oxides and increases the amount of active polysulphide produced particularly when using the lower manganese oxides. The co-catalyst also increases the number of cycles in which the most active catalyst, manganese dioxide, can participate before losing efficiency. Other elements in the same group and adjacent groups in the periodic table are active but these other elements are more soluble than bismuth and are toxic.

L'invention concerne du polysulfure produit par oxydation de liqueur blanche, contenant à la fois des composants actifs et des composants inactifs. Le polysulfure <= actif >= est le seul composantqui augmente le rendement en fibres. La quantité de polysulfure actif formé lorsque des oxydes de manganèse sont utilisés comme catalyseurs dans le processus de production est augmentée par l'ajout d'un cocatalyseur. L'ajout de composés de bismuth et, en particulier, d'oxyde de bismuth comme cocatalyseur augmente la quantité totale de polysulfure formé avec tous les oxydes de manganèse, et augmente la quantité de polysulfure actif produit, notamment lorsque les oxydes de manganèse inférieurs sont utilisés. Le cocatalyseur augmente également le nombre de cycles auxquels le catalyseur le plus actif, le dioxyde de manganèse, peut participer avant de perdre de son efficacité. D'autres éléments du même groupe et de groupes adjacents dans le tableau périodique sont actifs, mais ces éléments sont plus solubles que le bismuth et sont toxiques.

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