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Study on Odor Formation Control during Kraft Pulping
Song HaiNong,Chai XinSheng,Zhu HongXiang,Sung-Hoon Yoon,Zhang Dongcheng,Wang Shuang-Fei 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-
The investigation of the formation of organic sulfur compounds (i.e., odor species), mainly methyl mercaptan and demethyl suifide, during kraft pulping has been conducted, in which both hardwood and softwood species were used. It was discovered that there is an organic sulfur compounds formation phase transition point with respect to delignification extent. The transition point occurs at a kappa number of approximately 35 and 20 for softwoods and hardwoods, respectively. The results also showed that both low sulfidity and anthraquinone (AQ) addition are helpful to control the formation of theses organic sulfur compounds during kraft pulping. Whereas Hexenuronic acid (HexA) has contribution to Kappa number, the extended delignification not only lead to low pulp yield, but also be adverse to odor control. A significant in-digester odor reduction can be achieved if the pulping is to be terminated before phase transition point and combined with AQ addition.
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.