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本研究采用甲酸法蒸煮麦草,首先对蒸煮废液的物理化学性质进行检测,分别对残余木素及溶出木素进行红外谱图分析,探讨木素在蒸煮过程中的结构变化通过凝胶渗透色谱(GPC)得出木素的分子质量分布及变化,并对其进行分析对比结果表明:25℃下废液黏度1.25mPa·s,有机物含量19.30g·L~(-1),占总固形物的82.8%,无机物含量4.18g·L~(-1);蒸煮过程中由于α-醚键或β-醚键断裂产生了较多的共轭和非共轭C=O基团,溶出木素含有较多的伯醇-OH和仲醇-OH,有利于木素的进一步加工利用;溶出木素的平均分子质量大于残余木素的平均分子质量,为甲酸法制浆的最佳工艺条件的确定提供理论参考,同时为未来麦草甲酸制浆法工业化提供借鉴
In this study, the formic acid was used to steep the wheat straw. The physicochemical properties of the cooking waste liquor were firstly detected. The infrared spectra of residual lignin and dissolved lignin were analyzed respectively. The structural changes of lignin in cooking process were discussed by gel permeation chromatography (GPC), the molecular weight distribution and change of lignin were obtained and analyzed. The results showed that the viscosity of waste liquid was 1.25mPa · s at 25 ℃, and the content of organic matter was 19.30g · L -1, Of 82.8%, and inorganic content of 4.18g · L -1. During the cooking process, more conjugated and unconjugated C = O groups were generated due to the cleavage of α-ether bond or β-ether bond, Polyols containing more primary alcohol -OH and secondary alcohol-OH, is conducive to the further processing and utilization of lignin; the average molecular weight of lignin is greater than the average molecular weight of residual lignin, the optimum conditions for formic acid pulp To provide a theoretical reference for the determination, while providing reference for the future industrialization of straw formic acid pulping