Study on the Vapor-Liquid Equilibria using a Composition Analysis Technique from Ultrasonic speed for Hydrofluorocarbon Mixtures.
Project/Area Number |
09555230
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 展開研究 |
Research Field |
化学工学一般
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Research Institution | Kyoto Institute of Technology |
Principal Investigator |
TAKAGI Toshiharu Kyoto Institute of Technology, Faculty of Engineering and Design.Research Associate, 工芸学部, 助手 (20027816)
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Co-Investigator(Kenkyū-buntansha) |
FUKUSHIMA Masato Asahi Glass Co., Ltd., New Technology Development Center, Head Researcher, 技術開発部生産技術開発センター, 主任技師(研究職)
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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 |
¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥3,600,000 (Direct Cost: ¥3,600,000)
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Keywords | Vapor-liquid equilibria / Dew and bubble point / Alternative refrigerants / Binary mixtures / Ultrasonic speed analysis method / 二成分混合系 / 代替えフロン / 非塩素フロン / フロン混合系 / 音速濃度分析 |
Research Abstract |
The vapor-liquid equilibria for fluid mixture is important thermodynamic properties to measure the characteristics of system and to design the process. The studies on the vapor-liquid equilibria for several mixtures have been reported elsewhere. The composition of systems in these studies has been observed by analyzing on the gas clomatogram. However, this technique was very difficult to measure the vapor-liquid equilibria at very lower or higher temperatures than the room temperature. Because the different of conditions (pressure and/or temperature) between the sample chamber and the injection of gas-chlomatograph give rise to irregularity to the composition determination for systems, especially in the cases of those having higher bubble or dew points pressures. The ultrasonic speeds in fluid can be measured accurately at critical conditions. In the previous works. Takagi reported the vapor pressure and bubble point pressure for same hydrofluorocarbons measured by an acoustic absorptio
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n technique in the wide temperature ranges. In this work. the new apparatus for measurement the vapor-liquid equilibria was constructed. The method used here was the composition analysis technique from the ultrasonic speed in the hydrofluorocarbon mixtures. In the high pressure equilibrium cell made stainless steel, SUS3 16, two chambers to measure the ultrasonic speed in gas (upper side) and liquid (lower side) phases were set up in parallel. Also this vessel have two optical windows to observe the condition of cell inside. In order to confirm the reliability of new apparatus, the VLE for (1-x)HFC32 + x HFCI34a. which have the large difference in the vapor pressures between both pure substances. were measured at several temperatures. from 243.15 to 333.15 K, and compositions. x. The uncertainties of VLE obtained are within 2.5% for the bubble point pressure and 7% for the dew point pressure by comparison with the references data. For (1-x) HFC32 + x HFC 125, the vapor pressure difference between the pure substances was small. the VLE were also measured at same conditions described above. The experimental errors for this system. which have an azeotrope. were a larger than those for former system, especially for dew point pressure. Less
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Report
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Research Products
(4 results)
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[Publications] TAKAGI,T., Sakura, T., Tsuji, T., Hongo, M.: "Bubble point pressure for bunary mixtutes of difluoromethane With pentafluoroethane and 1,1,1,2-tetrafluoroethane" Pluid Phase Equilibria. (to be contribute).
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