2003 Fiscal Year Final Research Report Summary
Development of a Circulation System for Near-critical and Supercritical Fluid Solvents
| Project/Area Number |
13555210
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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 | 展開研究 |
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| Research Field |
反応・分離工学
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| Research Institution | Tohoku University |
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Principal Investigator |
SMITH Richard lee jr. Tohoku University, Research Center of Supercritical Fluid Technology, Professor, 超臨界溶媒工学研究センター, 教授 (60261583)
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| Co-Investigator(Kenkyū-buntansha) |
KUDO Kenichi JASCO, Researcher, 第二技術部LC応用技術科, 係長
KABYEMELA Bernard SR Kaihatsu, Researcher, 研究所, 外国人特別研究員
INOMATA Hiroshi Tohoku University, Research Center of Supercritical Fluid Technology, Professor, 超臨界溶媒工学研究センター, 教授 (10168479)
MATSUMURA Yukihiko JASCO, Researcher, 超臨界グループ, グループリーダー(研究職)
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| Project Period (FY) |
2001 – 2003
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| Keywords | supercritical fluids / CFD / natural convection / analytical equipment / circulation system / extraction / closed-loop |
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| Research Abstract |
A closed-loop high-pressure circulation system for supercritical fluids for analytical analyses was developed. The system operates on the principle of density differences induced by heating and cooling two different parts of the flow loop. The system was tested with textile materials. A method to measure the velocities was developed that used an organic solvent tracer. Performance of the system was evaluated by measuring average flow velocities attainable with CO_2. Initially, average flow velocities as high as 4 m/min could be obtained with heating and cooling temperature differences of 3 to 8℃. One-dimensional finite-difference simulation could predict the velocities to within 35%. Empirical equations could correlate the velocities to within 10%. Computational fluid dynamics (CFD) simulations were made. The CFD simulations could describe the flow velocities well from the experimentally measured temperature profiles. A new design for the heater is suggested based on CFD analysis that uses baffles and improves heater performance. System performance was improved to achieve flow velocities as high as 7 m/min through the use of internal heating and consideration of the pseudocritical point.
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