| 摘要 |
The adverse effects of dissolved organic material in the aqueous phase of pulp suspensions during bleaching using mixtures of chlorine dioxide and chlorine are overcome by applying the chlorine dioxide and chlorine serially to the pulp in two steps without an intermediate wash. An aqueous solution of chlorine dioxide or an aqueous solution of chlorine dioxide and chlorine may be used in the first step and chlorine is used in the second step. The novel processes decrease the consumption of bleaching chemicals. The process is especially useful when effected as the first stage of a multi-stage bleaching and purification operation. |
