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Comparison of the Isomerization Units from the Perspective of Process Design and Energy Studies for Producing High Quality Gasoline | ||
| Chemical Process Design | ||
| دوره 5، شماره 1، شهریور 2026، صفحه 1-13 اصل مقاله (1.12 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22111/cpd.2025.52134.1058 | ||
| نویسندگان | ||
| Fatemeh Mohammadzadeh؛ Majid Hayati-Ashtiani* | ||
| Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Iran. | ||
| چکیده | ||
| Optimizing energy consumption and gasoline quality in isomerization units has become very important, indicating the need to employ suitable process design methods and energy studies. Aspen HYSYS, Aspen Energy Analyzer, and Aspen Pinch software were utilized for simulation. Optimum heat integration opportunities were identified using composite curves and driving force plots. This study showed significant variations in the minimum approach temperature (ΔTmin.) among the units. Unit 1 showed the lowest ΔTmin. at 8°C, followed by units 2 and 3 at 9 and 10°C, respectively. Consequently, unit 1, with 35.65 MW of hot and 41.24 MW of cold utilities consumption at ΔTmin.= 8°C, demonstrated the highest potential for heat recovery when increasing ΔTmin. from 8 to 10°C. The first heat recovery scenario aimed to examine the Research Octane Number (RON) of the output stream from the Deisopentanizer (DIP) column, and the amount of isopentane recovery to improve the existing processes. Unit 2 has an octane number and isopentane recovery of 85 and 75.24%, respectively, which is the lowest amount among the three units. Economic analysis using Aspen Process Economic Analyzer revealed that unit 1 had the highest fixed (7.6×10+6 USD), operating (7.48×10+6 USD/year), and total costs (13.75×10+6 USD/year). The second scenario showed that 17% and 20% of the total required low pressure steam in Unit 1 and Unit 2 can be provided due to steam generation using process energy pockets, respectively. Results showed that the process design and operating conditions directly influence energy and RON. | ||
| کلیدواژهها | ||
| Energy saving؛ Gasoline؛ Isomerization؛ Isopentane؛ Optimization؛ Process design | ||
| مراجع | ||
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[3] Hosseini, M., Ghazizahedi, Z., Hayati-Ashtiani, M., 2025. Heat Integration of Isomerization Unit Using Loop Breaking. Chemical Process Design, In press. https://doi.org/10.22111/cpd.2025.51163.1049
[4] Manizadeh, A., Entezari A., Ahmadi R., 2018. The Energy and Economic Target Optimization of a Naphtha Production Unit by Implementing Energy Pinch Technology. Case Studies in Thermal Engineering, 12, 396-404. https://doi.org/10.1016/j.csite.2018.06.001
[5] Ghazizahedi, Z., Hayati-Ashtiani M., 2025. Retrofitting isomerization process to increase gasoline quality and decrease CO2 emission along with energy analysis using Pinch Technology. Energy Sources Part A: Recovery, Utilization, and Environmental Effects, 47, 3778-3789. https://doi.org/10.1080/15567036.2020.1859008
[6] Rahaghi, M.M., Hayati-Ashtiani, M., 2025. The Study of Decrease in CO2 Emission Using Pinch Technology. Chemical Process Design, In press. https://doi.org/ 10.22111/cpd.2025.51789.1055
[7] Alqahtani, N.S., Alrefai, T.A., Almutlaq, A.M., Alzahrani S.M., Abasaeed A.E., 2024. Energy Optimization through Heat and Power Integration on a Chlorobenzenes Production Plant. Processes, 12(3), 569. https://doi.org/10.3390/pr12030569
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[9] Ghazizahedi, Z., Hayati-Ashtiani M., 2018. Heat transfer enhancement to decrease the energy consumption of a Light Naphtha Isomerization unit by means of heat exchanger network retrofitting. IOP Conference Series Materials Science Engineering, 433, 012070. https://doi.org/10.1088/1757-899X/433/1/012070
[10] Naqvi, S. R., Bibi, A., Naqvi, M., Noor, T., Nizami, A., Rehan, M., Ayoub M., 2018. New trends in improving gasoline quality and octane through naphtha isomerization: a short review. Applied Petrochemical Research, 8, 131-139, https://doi.org/10.1007/s13203-018-0204-y
[11] Paiko, I.I., Azeez, O.S., Makwashi, N., Zhao, D., 2017. Pinch Analysis in Optimising Energy Consumption on a Naphtha Hydrotreating Unit in a Refinery. Petroleum and Petrochemical Engineering Journal, 1, 000126. https://doi.org/10.23880/PPEJ-16000126
[12] Hazazi, A., Farooq, Z., 2024. Heat Integration Retrofit for a Sustainable Energy-efficient Design: a Case Study of Aramco’s Refinery. Academia Green Energy, 1, 1-8. https://doi.org/10.20935/AcadEnergy6256
[13] Parkash, S., 2004. Hydrocarbon Processing. Refining Processes Handbooks. Gulf Publishing Company, Houston, Texas. | ||
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آمار تعداد مشاهده مقاله: 186 تعداد دریافت فایل اصل مقاله: 171 |
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