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효소 · 알칼리 증해의 (蒸解) 탈리그닌에 (脫) 관한 동역학적 분석
조병묵,신동소 ( Byoung Muk Jo,Dong So Shin ) 한국산림과학회 1982 한국산림과학회지 Vol.56 No.1
In order to obtain more detailed information concerning the degradation of lignin in the oxygen alkali pulping single stage isothermal delignification of pine wood meal (Pinus koraiensis S. et Z.) was studied in the oxygen alkali system at five temperature level (110℃, 120℃, 130℃, 140℃, 150℃) for 60 min. The rate constant, activation energy, oxygen and alkali consumption during the oxygen alkali delignification were determined by the kinetic method. The 2/5 of total lignin was eliminated at the start of the reaction. The deligminfication rate constant was about 3 times that of caustic soda pulping. The activation energy was about 1/3 lower than in caustic soda pulping. Like oxygen consumption alkali consumption was also rapid early at the reaction and almost ceased after about 10 min. The degradation reaction of lignin was strongly dependent upon the pH decrease of the cooking liquor by organic acid generated in pulping. The lignin in the oxygen alkali pulping degraded into lover molecular weight and had more hydrophillic properties. The methoxyl group decreased considerably at the first of oxygen alkali delignification. while the carbonyl, carboxyl and phenolic hydroxyl group increased rapidly.