微爆协同生物酶预处理对速生阔叶材化机浆成浆性能的影响机制

The drawbacks of chemi-mechanical pulp of fast-growing hardwood were high energy consuming, low physical properties and yellowing reversion. In order to improve pulp properties, micro-explosion coupled with enzymatic pretreatment was proposed in this project. Micro-explosion was a newly developed pulping terms, which was used to describe the chips micro-structure changes during hot water treatment. It would benefit for the subsequent enzymatic treatment and improving pulping process. The Poplar and Acacia, as well as models were chosen as raw material. The modern analysis technologies, such as AFM, SEM, CT and NMR, were employed to reveal the soluble matters and substrate properties changes after micro-explosion, including microstructure, chemical composition and structure. Also, the classification and controlling method of micro-explosion was established. The mechanism of micro-explosion coupled with enzymatic pretreatment on refining energy consumption and pulp properties in chemi-mechanical pulping of hardwood was investigated. The effect of micro-explosion severity and enzymatic pretreatment on fiber micro-structure and external surface changes was studied. Finally, the controlling of micro-explosion extent and enzymatic pretreatment on chemi-mechanical pulp was built. The completion of this project would enrich the theoretical knowledge of chemi-mechanical pulping process, which could also provide the foundation of high quality chemi-mechanical pulp production from fast-growing wood.

速生阔叶材化学机械制浆过程中存在磨浆能耗高、纸浆强度低、纸浆易返黄等缺陷，为了改善速生阔叶材的化学机械制浆性能，本项目提出微爆协同生物酶预处理技术，微爆是新提出的制浆造纸过程术语，是指热水处理过程中木片产生的不同程度微观组织结构形变现象，微爆具有提高后续生物酶处理作用效率和改善木材纤维制浆性能的优点。本项目拟以杨木、相思木等速生材和模型物为研究对象，采用AFM、SEM、CT、NMR等现代分析手段对微爆溶出物和木质纤维组织形貌、化学成分和结构等进行分析，确立微爆的分级标准及控制技术，揭示微爆协同生物酶预处理技术对速生阔叶材化学机械制浆过程中磨浆能耗和成浆性能的影响机制，阐明微爆等级与生物酶处理对纤维微观结构和表面特性变化的协同作用机制，建立速生阔叶材化机浆性能的微爆等级与生物酶协同处理调控机制，研究可丰富化机浆相关预处理技术理论体系，为速生材高得率高质量化机浆的清洁化生产提供理论指导。

针对速生阔叶材化学机械制浆过程中存在磨浆能耗高、纸浆强度低、纸浆易返黄等问题，本项目以杨木等速生材和模型物为研究对象，创建了微爆协同生物酶预处理新理论，研发了热水和生物酶预处理新技术：阐明了不同预处理条件对杨木热水处理液中总木糖、乙酸、木质素含量以及对木片微观结构的影响规律，构建了杨木片等热水预处理过程中主要糖类物质的反应动力学模型；发现了热水处理产生的微爆对提高后续生物酶处理作用效率和改善木材纤维制浆性能的规律；在对微爆溶出物和木质纤维组织形貌、化学成分和结构等进行分析的基础上，提出了热水预处理微爆系数概念和微爆的分级标准，构建了热水预处理微爆控制技术；揭示了热水预处理协同生物酶预处理技术对速生阔叶材化学机械制浆过程中磨浆能耗、纸浆漂白和成浆性能的影响机制；阐明了热水预处理（微爆）与生物酶处理对速生阔叶材纤维微观结构和表面特性影响的协同作用机制。研究成果丰富了阔叶材化机浆相关预处理技术理论体系，为速生材阔叶材高得率高质量化机浆的清洁化生产提供了理论指导和技术支持。