Development of the system for membrane separation of fatty aicd from supereritical carbon dioxide
| Project/Area Number |
08556019
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
食品科学・栄養科学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKAMURA Kozo 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 (50011036)
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| Co-Investigator(Kenkyū-buntansha) |
TORIKATA Yasuo Maeda Institute of High-Technology, Director, 取締役, 部長
SAKIYAMA Takaharu Okayama University, Dept, of Biotechnology, Lecturer, 工学部, 講師 (70170628)
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| Project Period (FY) |
1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1996: ¥6,500,000 (Direct Cost: ¥6,500,000)
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| Keywords | supercritical carbon dioxide / membrane separation / silica membrane / zeolite membrane / zeolite membrane |
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| Research Abstract |
A thin porous silica membrane (average pore size of 3.3 nm) was prepared by the sol-gel method and used to separate the solute from supercritical carbon dioxide. The characteristics of solute permeation were investigated in respect of the adsorption properties of the solute, the desorption rate of the solute from the membrane being measured and the potential energy of soulte near the silica surface being calculated by the molecular modeling technique. It was found that caffeine was strongly adsorbed to the surface and then slowly desorbed to form an adsorption layr, making the pores narrower and causing a molecular-sieving effect. Therefore, the rejection value was positive. On the other hand, the rejection value of n-octanoic acid, which was well adsorbed and rapidly desorbed, was negative. It is presumed that the molecules filled the pores due to their potential energy and were then forced to flow through the pores by the transmembrane pressure. Separation of caffeine from supercritical carbon dioxide was carried out with a zeolite membrane that has been tested in pervaporation. The pore size of a NaY zeolite membrane was evaluated to be subnanometer scale from the result of Dubinin-Astakhov analysis. The rejection of lauric acid was 0.88 for the zeolite membrane. A zeolite membrane was shown to be useful in SCCO_2 membrane separation.
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Report
(2 results)
Research Products
(3 results)
