| 摘要 |
<p>The invention relates to a process for the delignification of a chemical pulp, such as a sulfate or a sulfite pulp, in which process the pulp is treated with a peroxide in the presence of an activating Ti-, V- or Cr-group transition metal, such as molybdenum, vanadium or tungsten. The essential idea in the invention is that in the activated peroxide treatment the pulp is treated with a mixture of a peroxide and a peracid. The peroxide/peracid treatment may be part of a bleaching sequence which includes as potential other treatment steps, for example, a treatment with oxygen and a chelation for the removal of heavy metals, such as iron, manganse and/or copper.</p> |
