Five-lump kinetic model with selective catalyst deactivation for the prediction of the product selectivity in the fluid catalytic cracking process
Five-lump kinetic model with selective catalyst deactivation for the prediction of the product selectivity in the fluid catalytic cracking process
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DOI：
10.1016/j.cattod.2007.02.037
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发表时间：
2007-09-30
期刊：
影响因子：
5.3
通讯作者：
Vasalos, I. A.
中科院分区：
文献类型：
--
作者：
Bollas, G. M.;Lappas, A. A.;Vasalos, I. A.
流化催化裂化（FCC）操作的有效模拟需要很好地理解许多因素，如反应动力学，流体动力学，进料和催化剂的影响。可以获得的不同的产物分布是复杂反应方案的结果，包括裂化、异构化、氢转移、低聚等。此外，催化剂失活可能以不同的方式影响每一个反应，这产生了每种产物的产率随时间不同变化的额外原因。以希腊塞萨洛尼基化工研究所催化裂化中试装置的实验数据为基础，建立了催化裂化产品分布的集总模型。集总反应网络包括五个通用集总（瓦斯油、汽油、焦炭、液化产物气和干气）以模拟裂化反应并预测瓦斯油转化率和产物分布。研究了催化剂失活的途径，采用了选择性失活模型，增强了集总方案的基础性和准确性。提出了催化剂选择性失活的假设，改进了对产品分布的预测。研究了具有不同假设的模型，关于失活的催化剂的行为及其对集总方案的反应的影响。在CPERI的FCC中试装置上进行的大量实验数据库被用来验证模型在稳态单元操作中的性能。模拟结果显示了在FCC集总模型中加入选择性催化剂失活函数的重要性。(C)2007 Elsevier B.V.保留所有权利。
The effective simulation of the fluid catalytic cracking (FCC) operation requires a good understanding of many factors such as, reaction kinetics, fluid dynamics, and feed and catalyst effects. The different product slates that can be obtained are the consequence of a complex reaction scheme including cracking, isomerization, hydrogen transfer, oligomerization, etc. Furthermore, the catalyst deactivation may affect each one of the reactions in different ways, which creates an additional reason for different variation with time-on-stream of the yield to each product. On the basis of the experimental data of the FCC pilot plant operated in Chemical Process Engineering Research Institute (CPERI, Thessaloniki, Greece), a lumping model was developed for the prediction of the FCC product distribution. The lumped reaction network involved five general lumps (gas oil, gasoline, coke, liquefied product gas, and dry gas) to simulate the cracking reactions and to predict the gas oil conversion and the product distribution. The paths of catalyst deactivation were studied and a selective deactivation model was adopted that enhances the fundamentality and accuracy of the lumping scheme. The hypothesis of selective catalyst deactivation was found to improve the product slates prediction. Models with different assumptions were examined, regarding the behavior of the catalyst, as deactivated, and its effect on the reactions of the lumping scheme. A large database of experiments, performed in the FCC pilot plant of CPERI was used to verify the performance of the models in steady state unit operation. The simulation results depict the importance of incorporating selective catalyst deactivation functions in FCC lumping models. (C) 2007 Elsevier B.V. All rights reserved.