Thermodynamic Analysis on Isomerization of n-Pentane to Isopentane
The thermodynamic behaviors of n-pentane isomerization to isopentane were systematically analyzed using SRK equation, and thermodynamic data, phase state, equilibrium composition and equilibrium isomerization ratio of n-pentane under different reaction conditions were calculated. The results show that the reaction is exothermic and decreasing the reaction temperature favors the increasing of equilibrium isomerization ratio of n-pentane. When the reaction temperature is high (e.g. moderate temperature zeolite-based isomerization or solid superacid isomerization), the reaction system is gas phase and similar to ideal gas. Therefore, the effects of reaction pressure and molar ratio of hydrogen to hydrocarbon ( n(H2)/n(HC)) on equilibrium isomerization ratio of n-pentane are insignificant. At low reaction temperature (e.g. low temperature isomerization), the reaction system is gas phase or gas-liquid two-phase and shows nonideality. As a result, the influence of reaction pressure and n(H2)/n(HC) on the reaction should not be neglected. The equilibrium isomerization ratio of n-pentane can be increased by decreasing the reaction pressure or increasing n(H2)/n(HC).
Key words: n-pentane, isomerization, isopentane, thermodynamics, SRK equation
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| [2] | PENG Wenyu, HUANG Xiangliang, GONG Yan, GAO Yue, DAI Xiaoping, LIU Zongyan, DONG Le, TIAN Hongfeng. Isomerization Performance of Secondary Modified ZSM-35 Molecular Sieves of Magnesium Species [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2020, 36(3): 468-475. |
| [3] | LIU Zongyan, HUANG Xingliang, DONG Le, TIAN Hongfeng, PENG Wenyu, GAO Yue, DAI Xiaoping, ZHANG Xin. Effect of n（SiO2)/n(Al 2O 3) Ratio on the Catalytic Performance of ZSM-35 Zeolites in Pentene Skeleton Isomerization [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2020, 36(3): 453-459. |
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| [5] | ZHANG Guangdong, YU Zhongwei, WANG Zijian, MA Aizeng. Reaction Path and Process Conditions of Aromatization of n-Pentane to Produce Propane and Aromatics [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2020, 36(2): 420-427. |
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| [11] | XIA Daohong, CHEN Jinshe, CAI Tingting, ZHU Lijun, JIANG Shengjuan, DUAN Zunbin, YANG Lingbin. Preparation of NiH/Hβ Catalyst and Its Catalytic Activity in n-Hexane Isomerization [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2019, 35(1): 40-48. |
| [12] | MA Zhiming, MENG Xuan, LIU Naiwang, SHI Li. Preparation of Aluminum Modified Solid Acid Catalysts and Their Reactivity Ability in the Isomerization of n-Hexane [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2018, 34(6): 1067-1074. |
| [13] | JIA Zhiguang, REN Xingtao, WU Kai, YANG Guang. Effect of Reaction Pressure on the Performance of Catalyst in n-Butene Isomerization Reaction [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2018, 34(6): 1224-1228. |
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| [15] | LV Guang, LIU Zhongshan, WANG Congxin, MA Huaijun, QU Wei, WANG Dong’e, TIAN Zhijian. Effects of Detemplation Method on the Catalytic Performance of Pt/ZSM-23 in n-Alkane Isomerization [J]. ACTA PETROLEI SINICA (PETROLEUM PROCESSING SECTION, 2018, 34(4): 696-704. |
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