【摘要】 研究发现,硫酸盐法蒸煮液在800-900 nm近红光谱波段间的吸收主要来自其中的碱木素,而其中的D-葡萄糖、D-甘露糖、D-木糖、D-半乳糖和糖醛酸等碳水化合物的降解产物及二氯甲烷和苯醇抽出物在此波段基本上没有吸收。并在这段波段建立起的纸浆卡伯值近红外光谱测量模型。该模型显示蒸煮液的吸光度与纸浆卡伯值具有较好的线性关系(相关系数R2为0.996),并有较高的预测精度。因此,建议采用近红外光谱法实现硫酸盐法蒸煮过程纸浆卡伯值的在线测量,并有望开发出蒸煮过程纸浆卡伯值近红外光谱法在线测量仪,真正实现蒸煮过程的纸浆卡伯值的闭环反馈控制。更多还原

【Abstract】 This paper is focused to study the on-line determination of kappa number using near-infrared (NIR) spectroscopy during kraft pulping. The results showed that spent liquor’s absorbability of NIR spectroscopy in 800 -900 nm wave range was mainly from alkali lignin though there were also derivatives of polysaccharides such as D-glucose, D-mannose, D-xylose, D-galactose, extractives and inorganic materials in the spent liquor and that kappa number is well linear with the absorbance of spent liquor in the wave range with correlation coefficient R2=0. 996. NIR spectroscopic measurement of pulp kappa number has high prediction precision. Therefore, NIR spectroscopic method could be a promising method of on-line pulp kappa number determination during pulping.更多还原