| 费托蜡催化裂化反应生产清洁汽油的热力学分析 |
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| 引用本文： | 韩建年,王刚,杨梅,刘美佳,高成地,高金森. 费托蜡催化裂化反应生产清洁汽油的热力学分析[J]. 化工学报, 2020, 71(z1): 38-45. DOI: 10.11949/0438-1157.20190694 |
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| 作者姓名： | 韩建年 王刚 杨梅 刘美佳 高成地 高金森 |
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| 作者单位： | 中国石油大学（北京）重质油国家重点实验室，北京 102249 |
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| 摘 要： | 费托蜡主要由链烷烃组成，不含硫、氮等杂原子，是生产清洁汽油的优质原料。由于缺少芳烃和环烷烃，费托蜡催化裂化过程需要强化异构化、芳构化反应以实现降低汽油馏分烯烃含量、保持高辛烷值的目标。对费托蜡为原料的催化裂化反应体系进行热力学分析，重点计算了不同温度下生成汽油馏分主要烃类的反应焓变和反应平衡常数。研究结果表明，以大分子链烷烃为主的费托蜡，其裂化吸热反应焓变约为80 kJ/mol，反应平衡常数随温度的升高而增大，高温有利于一次裂化反应。对于异构化反应，主要是大分子链烷烃裂化为烯烃，再由烯烃分子转化为异构烷烃，因此对于异构化反应，可以通过优化反应器促进汽油烯烃的转化。在考察温度范围内，烯烃环化反应平衡常数随温度升高而减小，环烷烃脱氢芳构化反应平衡常数随温度升高而增大，所以适宜的反应温度是制约进一步增加汽油中芳烃的重要因素。
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| 关 键 词： | 费托蜡 催化裂化 焓 异构化 芳构化 燃料 烷烃 |
| 收稿时间： | 2019-06-20 |
| 修稿时间： | 2019-09-16 |
Thermodynamic study on fluid catalytic cracking of Fischer-Tropsch wax to produce clean gasoline |
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| HAN Jiannian,WANG Gang,YANG Mei,LIU Meijia,GAO Chengdi,GAO Jinsen. Thermodynamic study on fluid catalytic cracking of Fischer-Tropsch wax to produce clean gasoline[J]. Journal of Chemical Industry and Engineering(China), 2020, 71(z1): 38-45. DOI: 10.11949/0438-1157.20190694 |
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| Authors: | HAN Jiannian WANG Gang YANG Mei LIU Meijia GAO Chengdi GAO Jinsen |
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| Affiliation: | State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China |
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| Abstract: | Fischer-Tropsch (F-T) wax is mainly composed of long-chain paraffin without any sulfur or nitrogen and is well suited for producing clean gasoline. The contents of naphthenic and aromatic species of F-T wax are exceptionally low, a high gasoline fraction with a high-quality motor octane number and low olefin fraction is still problematic. Thus, the solution aims at enhancing isomerization and aromatization reactions in the fluid catalytic cracking (FCC) process. This paper shows that the thermodynamic analysis of the catalytic cracking reactions of F-T wax. Emphasis was given to the enthalpy change and equilibrium constant of the reaction to produce gasoline fraction at different temperatures. The results of the calculation indicate that the cracking of highly paraffinic F-T wax is endothermic （enthalpy change on reaction is about 80 kJ/mol）, and the equilibrium constant and the equilibrium conversion from reactant to products increase with increasing temperature.In the case of isomerization, the equilibrium constant of n-paraffin in isomerization is extremely lower than olefin. It s speculated that olefin cracked from n-paraffin isoforms further to i-paraffin, reasonably. Therefore, a zoned reactor can be designed to promote the conversion of olefin. The equilibrium constant of n-paraffin cyclization is low at different temperatures and then occurrence of reaction is difficult. On the other hand, the value of the equilibrium constant of aromatization of naphthenic is high, as a consequence, suitable reaction temperature is the key to increase the aromatics in gasoline further. |
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| Keywords: | Fischer-Tropsch wax FCC enthalpy isomerization aromatization fuel alkane |
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