| Project/Area Number |
08556026
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
林産学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MESHITSUKA Gyosuke The University of Tokyo, Graduate School of Agricultural and Life Sciences, Professor, 大学院・農学生命科学研究科, 教授 (30012074)
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| Co-Investigator(Kenkyū-buntansha) |
TANEDA Hidetaka Nippon Paper Industries Co., Ltd., Senior Research Scientist, 中央研究所, 主任研究員
SHINTANI Hiroyuki The University of Tokyo, Graduate School of Agricultural and Life Sciences, Assi, 大学院・農学生命科学研究科, 助手 (30282693)
MATSUMOTO Yuji The University of Tokyo, Graduate School of Agricultural and Life Sciences, Asso, 大学院・農学生命科学研究科, 助教授 (30183619)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥17,100,000 (Direct Cost: ¥17,100,000)
Fiscal Year 1997: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1996: ¥14,200,000 (Direct Cost: ¥14,200,000)
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| Keywords | Hydrotropic phnomenon / Hydrotropic salt / Lignin / Delignification / Residual lignin / Alkaline cooking / Kraft cooking / Kraft pulp |
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| Research Abstract |
It is requisite for the future growth of pulp and paper industries to develop new technologies which are environmentally friendly. In these technologies, chlorine chemicals currently used for the pulp bleaching should be totally avioded.
It is still not quite clear how lignin behaves during pulping and bleaching stages which are the main stages for pulp production. In other words, a part of lignin is very resistant against delignification even at the end of cooking, and this lignin thereafter is the target for chemicals at the bleaching stage. Therefore, it will open a new technology for pulping and bleaching, if the resistant nature of residual lignin become clear. In order to see the contribution of re-precipitation of lignin to the surface of pulp at the end of cooking, hydrotropic agent was added to the cooking solution. It was very interesting to note that the degree of delignification was increased remarkably, and the amount of residual lignin became about one half of the normal kraft cooking. This means that half of the residual lignin may be remained in pulp because of re-precititation, and so it is extremely important to develop a technology to avoid this phenomenon. Atomic Force Microscopy was found to be very useful to oberve the surface of pulp fibers. Very fine microfibrils and some small particles were confirmed on the fiber surface, and their behaviors were carefully studied in relation to various delignification treatments.
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