楮皮의 高收率 알칼리 蒸解反應의 速度論的 硏究 = A Kinetic Study on Cooking Reaction of Bark of Paper Mulberry during High Yield Alkaline Cooking

다국어 초록 (Multilingual Abstract)

It is a well known fact that the addition of polysulfide or borohydride into alkaline cooking liquor results in higher yields than an ordinary alkaline cooking liquor.
But the behavior of delignification during high yield alkaline cooking of the bark of paper mulberry does not seem to have been investigated kinetically.
This work provides some information about the kinetics of delignification reaction during high yield alkaline cooking under atmospheric pressure.
Experimentally, cooking was carried out on fine powder so than liquor penetration and diffusion would not be rate-controlling steps.
All of the cookings were carried out by the two-stage process ; the first stage was pretreated with polysulfide(Na_2S_4), and then pretreated sample powder was cooked with an ordinary soda cooking liquor at the second stage.
The results are summarized as follows ;
1. Polysulfide-soda cooking gave about 4~5 percent higher pulp yield at the same content of lignin than did an ordinary soda cooking.
2. Delignification rate during polysulfide-soda cooking was evidently faster than ordinary soda cooking.