| 摘要 |
The method involves making chemical pulp to react with chlorine dioxide at a temperature of 50 to 150 degree Celsius and a pH in the range from 2 to 7, until more than 90 percent of the chlorine dioxide is reacted. Aqueous mixture is made to react without separating off constituents of the mixture with 0.1 to 5 percent by weight of hydrogen peroxide in the presence of molybdate in an amount of 10 to 2000 ppm of molybdenum or tungstate in an amount of 200 to 10000 ppm of tungsten, at the temperature of 50 to 150 degree Celsius. The respective amounts are based on used mass of dry chemical pulp. Aqueous solution is brought into contact with water-insoluble, cationized inorganic support material, where cationized phyllosilicate or bentonite ion-exchanged with a quaternary ammonium salt is used as the material. |
