木质纤维自水解过程中低分子生物活性抑制性物质产生途径及其动力学研究

利用硫酸盐法生产溶解浆技术中，水热自水解被公认为是一种低污染、高效率的环境友好型半纤维素提取技术。在高温酸性自水解条件下木质纤维极易转化成低分子有机酸、糠醛和溶解性酚等生物活性抑制性物质。木质纤维化学成分和组织结构越复杂，自水解条件越高，这部分物质产生机制及定性和定量越复杂。项目采用理论分析、试验研究、模型物模拟和数值分析相结合的研究方法，以木质纤维组织结构和化学特性为切入点，以提取半纤维素、磨木木素及其低聚模型物为参照物，研究不同自水解温度、时间和液比条件下半纤维素和木素降解产物形成机制与途径；采用最小二乘算法，基于集总动力学原理，研究高温水热条件下不同自水解阶段，木质纤维主成分水解、降解及低分子化转化条件、连续均相水解和两相水解边界条件判据；建立纳入低分子生物活性抑制性物质的木质纤维水热自水解、降解动力学模型。为木质纤维制浆-生物质精炼一体化工业模式构建提供理论依据和技术支撑。

On the Kraft-based dissolving pulp prduction process,the thermal water self-hydrolyzed process has been known an environment friendly process of hemi-cellulose extraction with low pllution and high efficiency. Under the self-hydrolyzed conditions of high temperature and acid, it is often accompanied by the generation of low molecular organic acid, furfural and dissolved phenols substances with biological activity inhibtion. The more complex the chemical component and tissue structure of wood fiber is and the more severity the self-hydroyzed conditions is applied, the more complex happens to this part substances generation mechanism and qualitativty and quantitativity. This project will adapt combination research method of theoretical analysis, experimental research, model simulation and numerical analysis, with the tissue structure and chemical properties as breakthrough point, with extracted hemi-cellulose, milled lignin and oligomeric model as reference, the formation mechanism and path of degradation products from hemi-cellulose and lignin will be researched with different temperature, time and liquor ratio of self-hydrolyzed conditions; With the least square algorithm and based on the principle of lumped kinetics, the transformation conditions for the main component of wood fiber to hydrolysis, degradation and into low molecular and the criterion of boundary conditions for consecutive homogeneous and biphasic pattern hydrolysis will be investigated under different self-hydrolyzed phase of high temperature thermal water enviroment. Through which, dynamic model including the generation of low molecular biological activity inhibition of wood fiber self-hydrolysis and degradation under therrmal water conditions will be established to provide principle basis and technical support for the construction of integrative pulping and biorefinery industry mode of wood fiber.