D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/17
D21C 3/02 (2006.01)
Patent
CA 1192707
ABSTRACT The invention relates to the production of polysulphide for the treatment of wood chips so that the consumption thereof is reduced in sulphate digestion of paper pulp. The pulp is prefer- ably subjected to such a bleaching that implies access to oxygen in the pulp factory. In an impregnation stage the wood chips are caused to react with black liquor, or digestion liquor prepared from white liquor and containing black liquor, while introducing oxygen of appropriate concentration. The content of monosulphide, and to a certain extent other sulphur compounds also of the liquors, then forms polysulphide in contact with the wood chips which instan- taneously adsorb polysulphide. The generation of polysulphide is promoted by wood reactions. Black liquor having a reduced content of hydroxides is extracted from the wood chips before delignificat- ion thereof in digestion liquor prepared of white liquor and resi- dual of impregnation liquor from the wood chips. The extracted black liquor is conveyed to a plant for regeneration of hydroxide in white liquor and sulphide totally or partly in the form of white liquor and which is again polysulphide-oxidized. The increase of the yield of pulp from the digester as well as after the bleaching stage is greater in oxidative polysulphide production in the presence of wood chips than in separate production thereof in liquor before the charging into wood chips. The invention is well adapted for continuously as well as batchwise performed pulp di- gestion.
417241
Mannbro Nils V.
Smart & Biggar
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