| 利用PR状态方程计算临界终点 |
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| 引用本文： | 杨全,朱慎林,李以圭.利用PR状态方程计算临界终点[J].中国化学工程学报,2009,17(5):791-795. |
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| 作者姓名： | 杨全 朱慎林 李以圭 |
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| 作者单位： | 1. Key Laboratory of Energy Resources & Chemical Engineering, Ningxia University, Yinchuan 750021, China;2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| 基金项目： | Supported by the P&G Corporation |
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| 摘 要： | In the design of chemical processes, such as catalytic cracking of bitumen and heavy oil, the knowledge of phase behavior at the critical endpoint is essential. Based on the PR equation of state, the algorithm developed by Heidemann and Khalil for calculating critical properties was used to compute critical points. An algorithm for determining the equilibrium phase of the critical point using the tangent plane criterion was developed, and was used to calculate the critical endpoints of different mixtures, including non-polar, polar and associating systems. The critical endpoint, representing the type of the phase behavior, was employed to fit the interaction parameter of mixtures in critical state at high pressure. Lines of critical endpoints for ternary mixtures were also determined with the algorithm.
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| 关 键 词： | critical endpoint PR equation of state interaction parameter |
| 收稿时间： | 2008-12-29 |
| 修稿时间： | 2009-4-17
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Prediction of Critical Endpoints Based on the PR Equation of State |
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| YANG Quan,ZHU Shenlin,LI Yigui.Prediction of Critical Endpoints Based on the PR Equation of State[J].Chinese Journal of Chemical Engineering,2009,17(5):791-795. |
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| Authors: | YANG Quan ZHU Shenlin LI Yigui |
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| Affiliation: | 1. Key Laboratory of Energy Resources & Chemical Engineering, Ningxia University, Yinchuan 750021, China;2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | In the design of chemical processes, such as catalytic cracking of bitumen and heavy oil, the knowledge of phase behavior at the critical endpoint is essential. Based on the PR equation of state, the algorithm developed by Heidemann and Khalil for calculating critical properties was used to compute critical points. An algorithm for determining the equilibrium phase of the critical point using the tangent plane criterion was developed, and was used to calculate the critical endpoints of different mixtures, including non-polar, polar and associating systems. The critical endpoint, representing the type of the phase behavior, was employed to fit the interaction parameter of mixtures in critical state at high pressure. Lines of critical endpoints for ternary mixtures were also determined with the algorithm. |
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| Keywords: | critical endpoint PR equation of state interaction parameter |
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