高得率竹浆中非木素组分的光热诱导返色机理和生物调控

Bamboo is a very promising renewable raw material for replacing hardwood or softwood in making high yield pulp (HYP); however, it is very difficult with current pulping and bleaching technology to achieve high brightness and to avoid brightness reversion of bamboo HYP. In our previous studies, we have found that not only lignin but also some non-lignin components in bamboo material such as lips, polysaccharides, wax and other extractable components contribute to the bleaching of bamboo HYP and color reversion of the pulp. . The proposed research will investigate the role of these non-lignin components in bamboo HYP bleaching and the fundamental mechanisms behind. Several leading-edge techniques such as HPLC, FT-IR, NMR, CLSM, SIMS, FE-SEM, AFM will be used in this study to tackle more fundamental questions associated. We will also develop enzyme pretreatment technology for bamboo HYP process in order to reduce or eliminate the adverse effect of those non-lignin components on bamboo HYP brightness. Both an APMP process and a CTMP process will be investigated. In developing the enzyme technology, we will use a systems approach to consider not only the effect of enzyme on HYP color but also on the subsequent refining energy and on the bonding ability of the resultant pulp. It is expected that the results of the proposed research will provide fundamental understanding of the key technical issues involved in bamboo HYP production, which will support the development of an economically viable technology for the pulp and paper industry in China.

竹子是一种可取代阔叶木和针叶木制备高得率浆的优良造纸原料。但是目前的竹子高得率浆存在难漂白、易返黄的问题，本课题组之前研究发现竹子中的非木素成分如脂肪、多糖组分、蜡及其他抽出物对竹子高得率浆的返黄有较大影响。. 本项目主要采用APMP和CTMP高得率浆技术，使用HPLC, FT-IR, NMR, CLSM, SIMS, FE-SEM, AFM等来研究非木素组分在竹子高得率制浆漂白中的影响和作用机理；利用酶预处理技术对部分非木素组分进行选择性的去除，探索抑制或减轻高得率竹子化机浆返黄的生物处理新方法及作用机制，在酶处理改善高得率竹浆返黄程度的同时也改善高得率竹浆的磨浆能耗和及纸浆质量。通过上述研究，以期为解决竹子高得率浆的技术瓶颈问题提供一定的基础理论依据，支持经济可行的高得率浆技术在我国制浆造纸工业中的发展。

本项目以竹子为原料，完成了高得率竹浆中非木素组分的分离及发色基团的鉴定，分析其在制浆及漂白过程中含量、分布及成分变化，阐明了对纸张白度和返黄的影响，较好地揭示了非木素组分在竹子高得率制浆漂白中的作用机理。利用酶预处理技术对部分非木素组分进行选择性去除，探索抑制或减轻高得率竹浆返黄的生物处理新方法及作用机制，在酶处理改善高得率竹浆返黄程度的同时也改善高得率竹浆的纤维结合性能。本项目研究成果可为竹子高得率浆难漂白、易返黄的技术瓶颈问题提供一定的技术参考，支持低污染的高得率制浆技术在我国制浆造纸工业中的应用和发展。