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对我国北方阔叶木速生材三倍体毛白杨进行深度脱木素的改良硫酸盐法蒸煮(EMCC),得到EMCC纸浆。采用酶-弱酸解两段法从原料和EMCC纸浆中分离出原料木素和纸浆残余木素;采用酸析法从EMCC蒸煮黑液中分离出黑液溶出木素样品,再经弱酸水解得到纯的黑液溶出木素。通过凝胶渗透色谱(GPC)分析,对所得木素样品分别进行了相对分子质量的检测,分析了EMCC蒸煮过程中木素相对分子质量的变化。通过磷谱核磁共振~(31)P-NMR技术得出木素结构谱图,对原料木素、纸浆残余木素和黑液溶出木素结构中各官能团进行定量分析对比,研究木素结构在EMCC蒸煮过程中的变化规律。
Deep-delignification improved kraft cooking (EMCC) was carried out on the triploid Populus tomentosa wood from Chinese Hardwood Quercus mongolica in northern China to obtain EMCC pulp. The raw lignin and pulp residual lignin were separated from the raw materials and EMCC pulp by enzymatic-weak acid hydrolysis method. The dark liquor lignin-dissolving lignin samples were separated from the EMCC cooking black liquor by acid analysis, Black liquor dissolves lignin. The relative molecular mass of the obtained lignin samples were respectively detected by gel permeation chromatography (GPC) analysis, and the changes of relative molecular mass of lignin in the EMCC cooking process were analyzed. The structure diagram of lignin was obtained by phosphorus (31) P-NMR spectroscopy. Quantitative analysis and comparison of the functional groups in lignin, lignin and lignin from pulping liquor were carried out to study the effect of lignin structure on Variation of EMCC cooking process.