Research Initiation: Kinetic Study of Kraft Delignificationby On-Line Sampling and Analysis

这项工作是卡夫脱木质素反应的基础研究，目的是确定关键的可测量的反应参数，可用于跟踪反应的进展。一套白酒分析系统将用于监测白酒的一系列综合特性。活性化学物质的损耗将通过现场监测液的电导率和提取液样品的离子色谱法来测量。溶解木质素的数量将通过吸光度来监测。凝胶渗透色谱法将用于测量木质素的分子量分布。循环液中溶解的固体总量将用折射率检测器来测量。在此基础上建立了一个动力学模型。研究结果将有助于开发一种基于可测量酒液性质的控制系统。这种控制系统将提高制浆作业的生产率，以更高的产量生产质量均匀的纸浆，并改善制浆作业的整体经济效益。纸浆和造纸工业是美国的第三大工业。即使收益率小幅上升，也会对美元产生巨大影响。这项工作可以加强对木屑消化器的控制，从而获得更均匀的纸浆，更高的产品质量和更高的产量。

This work is a fundamental study of the Kraft delignification reaction with the goal of identifying the key measurable reaction parameters that can be used for following the progress of reaction. A liquor- analysis system will be used to monitor a comprehensive array of liquor characteristics. Depletion of active chemicals will be measured by monitoring in-situ the conductivity of the liquor and by ion chromatography of the extracted liquor samples. The quantity of dissolved lignin will be monitored by absorbance. Gel permeation chromatography will be used to measure the molecular weight distribution of lignin. The total dissolved solids in the circulating liquor will be measured by using a refractive index detector. A kinetic model based on these measured liquor characteristics will be developed. The result will help develop a control system based on measurable liquor property. Such a control system will result in increased productivity of the pulping operation by producing a uniform quality of pulp at a higher yield and improve the overall economics of the pulping operation. The pulp and paper industry is the third largest industry in the United States. Even small increases in yield would have a large dollar impact. This work could lead to the enhanced control of the wood chip digester thus resulting in a more uniform pulp, higher product quality, and higher yield.