正丁烷异构化制异丁烷反应热力学分析及试验研究 |
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引用本文: | 刘洪全 于中伟 张秋平 王杰广 马爱增 孔令江 王子健. 正丁烷异构化制异丁烷反应热力学分析及试验研究[J]. 石油炼制与化工, 2022, 53(8): 68-72 |
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作者姓名: | 刘洪全 于中伟 张秋平 王杰广 马爱增 孔令江 王子健 |
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作者单位: | 中国石化石油化工科学研究院 |
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摘 要: | 在分析正丁烷异构化制异丁烷反应特点的基础上,通过系统的热力学计算,获得了不同反应温度下目标反应的标准摩尔焓变、标准摩尔吉布斯自由能变、标准平衡常数及正丁烷平衡转化率,并以Pt/Al2O3-Cl为催化剂进行了正丁烷异构化反应试验研究。结果表明,正丁烷异构化属微放热反应,降低反应温度可提高正丁烷的平衡转化率;对于Pt/Al2O3-Cl催化正丁烷异构化反应,反应温度、反应压力、正丁烷进料空速和氢/烃摩尔比均对正丁烷转化率有较明显的影响,选择合适的反应温度和压力,并适当降低进料空速和氢/烃摩尔比,有利于提高正丁烷转化率;在优化的反应条件下,正丁烷的试验转化率与热力学平衡转化率基本吻合,验证了热力学分析结果的可靠性。
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关 键 词: | 正丁烷 异构化 异丁烷 热力学 平衡 |
收稿时间: | 2021-12-13 |
修稿时间: | 2022-02-07 |
THERMODYNAMIC ANALYSIS AND EXPERIMENTAL STUDY ON THE ISOMERIZATION OF n-BUTANE TO ISOBUTANE |
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Abstract: | Based on the analysis of the reaction characteristic and thermodynamic behaviors of n-butane isomerization to isobutane, standard molar enthalpy change, standard molar Gibbs free energy change, standard equilibrium constant and equilibrium conversion of n-butane at different temperatures were obtained, and the n-butane isomerization over Pt/Al2O3-Cl catalyst was investigated. The results show that the isomerization of n-butane is an exothermic reaction, and the equilibrium conversion of n-butane can be increased by lowering the reaction temperature. In the n-butane isomerization catalyzed by Pt/Al2O3-Cl, the reaction temperature, reaction pressure, space velocity of n-butane and molar ratio of hydrogen to hydrocarbon (H2/HC) have obvious effects on the conversion of n-butane. The n-butane conversion can be increased by selecting reaction temperature and pressure carefully and decreasing n-butane space velocity and H2/HC molar ratio properly. Under optimum reaction conditions, the conversion of n-butane was in good agreement with that of thermodynamic equilibrium, which proved the reliability of thermodynamic analysis. |
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Keywords: | n-butane isomerization isobutane thermodynamics equilibrium |
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