| 摘要 |
This invention relates to an environmentally preferred process for the delignification of a cellulosic biomass comprising pulp. The process uses the oxidative properties of nascent oxygen to complete pulping and bleaching operations. The process may be used in a pulping stage, a bleaching stage or can be used for both the pulping and bleaching stages of a delignification process. The process does not rely on large volumes of environmentally offensive chemicals such as caustic soda, sulfur, and chlorine to achieve delignification of the pulp. The delignification process entails providing a defiberized, lignin-containing biomass of cellulosic material; reducing said biomass to a fiber slurry of lignin-containing cellulosic material; adding a fiber protecting additive to said fiber slurry, modifying the lignin in said fiber slurry; by the in situ formation of nascent oxygen in said fiber slurry and extracting at least a portion of said lignin from said fiber slurry by washing said fiber slurry with an aqueous solution of an alkaline material.
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