| 摘要 |
In the manufacture of bleached sulphate pulp a chemical cellulose pulp is delignified with an alkaline polysulphide solution after cooking but before any bleaching. According to the invention the pulp is treated after digestion at a temperature of 100-160 .degree.C with a solution containing 0.2-0.6 mol/l effective alkali, 0.5-5 per cent by weight sulphur of the weight of the pulp in the form of polysulphide, i.e. Na2Sx, where x is 2 or higher, and in the presence of a stabilizer for polysulphide. |
