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Study on the Mass Transfer Behavior of AQ and Its Effectiveness during AQ-Kraft Pulping Process
XIANNAN HUANG,HAINONG SONG,CHENGRONG QIN,SUNG-HOON YOON,XIN-SHENG CHAI 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-
Studies of the effectiveness of anthraquinone (AQ) in kraft-AQ pulping in terms of its mechanism of mass transfer have been conducted. Experiments performed have demonstrated an “apparent solubility” of AQ in caustic solutions of wood lignin. The adsorption behavior of AQ species was also analyzed. Anthraquinone-2-sulfonic acid (AQ-S), a watersoluble derivative of AQ, showed selective adsorption on wood. A mechanism for the transport of AQ into wood chips during kraft pulping are proposed, and some explanations for previously unexplained observations are addressed.
XIN-SHENG CHAI,JINGHONG ZHOU,HONGXIANG ZHU,XIANNAN HUANG 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-
This paper describes a technique combining chemometrics with UV spectroscopy for the determination of the concentrations of two tissue additives (i.e., wet strength and softening agents) in a cellulose fiber containing solution. In single agent solutions, the concentration of the additive can be measured by UV spectroscopy at the wavelength where the species having absorption. For a binary (i.e., containing two additives) solution system, the spectral characterization is very complicated. However, if aided by a chemometrical calibration technique, each additive in the binary solution can be qua ntified simultaneously. The present method is very rapid and simple, it can easily perform a continuous measurement in the changes in the additives’ concentration after fiber addition, and therefore this becomes a valuable tool for the adsorption kinetics study of chemical additives onto the cellulose fibers. The time-dependent adsorption behaviors of the wet-strength, softening agent, and their both on fiber were also presented.