菜種茎パルプの研究 (II)
〔II〕亜硫酸塩法
1958 年 12 巻 10 号 p. 670-674
詳細
1958 年 12 巻 10 号 p. 670-674
I reported the cooking of the stalk of Rape-seed by sulphate method and concluded that the pulp was easy to wet beating and as strong as hard wood pulps.
So in this paper, I try pulping of it by sulphite method. The concentration of cooking liquor is 0.03 mol sulphite and 0.4 mol. bisulphite and base is Na or Mg. Optimum digestion time is 180 minutes at 165°C for both bases. Steeping time is enough 60 minutes at 110°C for Na base but is neccessary at least 90 minutes at the same temperature for Mg base. Pulp yield is about 46% for easy bleach and 5359% for strong pulp. And these results are better than rice and barley straw.
