Crystal Structure Change and Recrystalization of Cellulose in Supercritical Water
| Project/Area Number |
09650819
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
ADSCHIRI Tadafumi Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (60182995)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Supercritical water / Cellulose / Crystal structure / Recrystalization / Diamond anvil cell / 構造変化 |
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| Research Abstract |
1) In-situ observation using diamond anvil cell (DAC)
Cellulose powders were loaded in a diamond anvil cell (DAC) with distilled water and heated up to 400 ﾟC at a heating rate of 10ﾟC.Below 280ﾟC, cellulose particle size decreased generally with time. However, at a temperature range from 300ﾟC to 320ﾟC, the cellulose particles disappeared immediately without changing particle size and shape. This phenomenon suggests that cellulose dissolves into hot compressed water above 300ﾟC.
The hydrolysis rate of cellulose in sub- or supercritical water was measured by using a flow type apparatus. We found that the drastic increase of the rate at around 350ﾟC.The one of the reason of the drastic increase of the hydrolysis rate of cellulose might be the dissolution of cellulose in hot water.
2) Analysis of precipitates
We found that white precipitates in the liquid effluent came out after few hours. This precipitate was analyzed by FTIR and identified as a cellulose-like material. The collected amount of precipitate in the liquid effluent increased with the reaction time and shows maximum at 400ﾟC.XRD analysis of the precipitate shows the cellulose crystal structure.
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Report
(3 results)
Research Products
(5 results)
