Exergy and exergoeconomic analyses for integration of aromatics separation with aromatics upgrading

Abstract

Methanol to aromatics produces multiple products, resulting in a limited selectivity of xylene. Aromatics upgrading is an effective way to produce more valuable xylene product, and different feed ratios generate discrepant product distributions. This work integrates the aromatics separation with toluene disproportionation, transalkylation of toluene and trimethylbenzene, and isomerization of xylene and trimethylbenzene. Exergy and exergoeconomic analyses are conducted to give insights in the splitting ratios of benzene, toluene and heavy aromatics for aromatics upgrading. First, a detailed simulation model is developed in Aspen HYSYS. Then, 300 splitting ratio sets of benzene and toluene for conversion are studied to investigate the process performances. The results indicate that there are different preferences for the splitting ratios of benzene and toluene in terms of exergy and exergoeconomic performances. The process generates lower total exergy destruction when the splitting ratio of toluene varies between 0.07 and 0.18, and that of benzene fluctuates between 0.55 and 0.6. Nevertheless, the process presents lower total product unit cost with the splitting ratio of toluene less than 0.18 and that of benzene fluctuating between 0.44 and 0.89. Besides, it is found that distillation is the biggest contributor to the total exergy destruction, accounting for 94.97%.

Key words： aromatics separation and upgrading; variant splitting ratios; total exergy destruction; total product unit cost

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 21736008) and the National Key Research and Development Program of China (Grant No. 2018YFB0604803).

References

1 Tsai T C, Liu S B, Wang I. Disproportionation and transalkylation of alkylbenzenes over zeolite catalysts. Applied Catalysis A: General, 1999, 181( 2): 355– 398

2 Du J. Prospects of China’s aromatic hydrocarbon industry based on material properties. Advanced Materials Research, 2014, 1021 : 42– 45

3 Al-Khattaf S, Tukur N M, Al-Amer A. 1,2,4-Trimethylbenzene transformation reaction compared with its transalkylation reaction with toluene over USY zeolite catalyst. Industrial & Engineering Chemistry Research, 2007, 46( 13): 4459– 4467

4 Jiang J, Zhang D, Feng X, Yang M, Wang Y. Process design and analysis of aromatics production from coal via methanol with a high yield. Industrial & Engineering Chemistry Research, 2021, 60( 15): 5574– 5587

5 Zhang J, Qian W, Kong C, Wei F. Increasing para-xylene selectivity in making aromatics from methanol with a surface-modified Zn/P/ZSM-5 catalyst. ACS Catalysis, 2015, 5( 5): 2982– 2988

6 Chen Z H, Hou Y L, Yang Y F, Cai D L, Song W L, Wang N, Qian W Z. A multi-stage fluidized bed strategy for the enhanced conversion of methanol into aromatics. Chemical Engineering Science, 2019, 204 : 1– 8

7 Song W, Hou Y, Chen Z, Cai D, Qian W. Process simulation of the syngas-to-aromatics processes: technical economics aspects. Chemical Engineering Science, 2020, 212 : 115328

8 Zhang D, Yang M, Feng X, Wang Y. Integration of methanol aromatization with light hydrocarbon aromatization toward increasing aromatic yields: conceptual process designs and comparative analysis. ACS Sustainable Chemistry & Engineering, 2020, 8( 30): 11376– 11388

9 Hamedi N, Nategh M, Keshtkari F, Rahimpour M R. Development of a rigorous two-dimensional mathematical model for a novel thermally coupled reactor for simultaneous production of xylenes, hydrogen, and toluene. Chemical Engineering Research & Design, 2017, 127 : 126– 145

10 Al-Mubaiyedh U A, Ali S A, Al-Khattaf S S. Kinetic modeling of heavy reformate conversion into xylenes over mordenite-ZSM5 based catalysts. Chemical Engineering Research & Design, 2012, 90( 11): 1943– 1955

11 He C, You F. Shale gas processing integrated with ethylene production: novel process designs, exergy analysis, and techno-economic analysis. Industrial & Engineering Chemistry Research, 2014, 53( 28): 11442– 11459

12 Niziolek A M, Onel O, Guzman Y A, Floudas C. Biomass-based production of benzene, toluene, and xylenes via methanol: process synthesis and deterministic global optimization. Energy & Fuels, 2016, 30( 6): 4970– 4998

13 Niziolek A M, Onel O, Floudas C A. Production of benzene, toluene, and xylenes from natural gas via methanol: process synthesis and global optimization. AIChE Journal, 2016, 62( 5): 1531– 1556

14 Wang X, Su M, Zhao H. Process design and exergy cost analysis of a chemical looping ammonia generation system using AlN/Al₂O₃ as a nitrogen carrier. Energy, 2021, 230 : 120767

15 Ibrahim A G M, Rashad A M, Dincer I. Exergoeconomic analysis for cost optimization of a solar distillation system. Solar Energy, 2017, 151 : 22– 32

16 Tsatsaronis G. Thermoeconomic analysis and optimization of energy systems. Progress in Energy and Combustion Science, 1993, 19( 3): 227– 257

17 Mestre-Escudero R, Puerta-Arana A, González-Delgado Á D. Process simulation and exergy analysis of a mercaptan oxidation unit in a latin american refinery. ACS Omega, 2020, 5( 34): 21428– 21436

18 Lei Y, Chen Y, Yang Y, Liu X, Luo H, Yan W. Advanced exergy analysis for a novel gasoline absorption–stabilization process. ACS Omega, 2021, 6( 23): 15332– 15347

19 Yang Q, Qian Y, Kraslawski A, Zhou H, Yang S. Advanced exergy analysis of an oil shale retorting process. Applied Energy, 2016, 165 : 405– 415

20 Mehrpooya M, Lazemzade R, Sadaghiani M S, Parishani H. Energy and advanced exergy analysis of an existing hydrocarbon recovery process. Energy Conversion and Management, 2016, 123 : 523– 534

21 Wei Z, Zhang B, Wu S, Chen Q, Tsatsaronis G. Energy-use analysis and evaluation of distillation systems through avoidable exergy destruction and investment costs. Energy, 2012, 42( 1): 424– 433

22 Zhang D, Yang M, Feng X. Aromatics production from methanol and pentane: conceptual process design, comparative energy and techno-economic analysis. Computers & Chemical Engineering, 2019, 126 : 178– 188

23 Zhang D, Jiang J, Yang M, Feng X, Wang Y. Simulation-based superstructure optimization for the synthesis process of aromatics production from methanol. ACS Sustainable Chemistry & Engineering, 2021, 9( 30): 10205– 10219

24 Liu H X, Xie Z K, Zhang C F, Chen Q L. Chemical equilibrium of toluene disproportionation and trimethylbenzene transalkylation. Petrochemical Technology, 2003, 32( 1): 28– 32

25 Hamedi N, Iranshahi D, Rahimpour M R, Raeissi S, Rajaei H. Development of a detailed reaction network for industrial upgrading of heavy reformates to xylenes using differential evolution technique. Journal of the Taiwan Institute of Chemical Engineers, 2015, 48 : 56– 72

26 Xu C. The Technologies of Catalytic Reforming. 2nd ed. Beijing: China Petrochemical Press, 2014, 958 (In Chinese)

27 Wu C, Wang S, Li J. Exergoeconomic analysis and optimization of a combined supercritical carbon dioxide recompression Brayton/organic flash cycle for nuclear power plants. Energy Conversion and Management, 2018, 171 : 936– 952

28 Wu Z, Zhu P, Yao J, Zhang S, Ren J, Yang F, Zhang Z. Combined biomass gasification, SOFC, IC engine, and waste heat recovery system for power and heat generation: energy, exergy, exergoeconomic, environmental (4E) evaluations. Applied Energy, 2020, 279 : 115794

29 Fu Q S. Thermodynamic Analysis Method of Energy System. Xi’an: Xi’an Jiaotong University Press, 2005, 304 (In Chinese)

30 Yang S Y. Ecological-based life cycle assessment methodology and the application to energy-chemical processes. Dissertation for the Doctoral Degree. Guangzhou: South China University of Technology, 2016, 156

31 Feng X Wang Y F. Principles and Technology of Chemical Energy Saving. 4th ed. Beijing: Chemical Industry Press, 2015, 372 (In Chinese)

32 Musharavati F, Ahmadi P, Khanmohammadi S. Exergoeconomic assessment and multiobjective optimization of a geothermal-based trigeneration system for electricity, cooling, and clean hydrogen production. Journal of Thermal Analysis and Calorimetry, 2021, 145( 3): 1673– 1689

33 Lee Y D, Ahn K Y, Morosuk T, Tsatsaronis G. Exergetic and exergoeconomic evaluation of an SOFC-Engine hybrid power generation system. Energy, 2018, 145 : 810– 822

34 Sadaghiani M S, Mehrpooya M, Ansarinasab H. Process development and exergy cost sensitivity analysis of a novel hydrogen liquefaction process. International Journal of Hydrogen Energy, 2017, 42( 50): 29797– 29819

35 Zhang L, Pan Z, Yu J, Zhang N, Zhang Z. Multiobjective optimization for exergoeconomic analysis of an integrated cogeneration system. International Journal of Energy Research, 2019, 43( 5): 1868– 1881

36 Habibollahzade A, Gholamian E, Behzadi A. Multi-objective optimization and comparative performance analysis of hybrid biomass-based solid oxide fuel cell/solid oxide electrolyzer cell/gas turbine using different gasification agents. Applied Energy, 2019, 233-234 : 985– 1002

37 Seider W D, Seader J D, Lewin D R, Widagdo S. Product and Process Design Principles: Synthesis, Analysis and Evaluation. 3rd ed. New Jersey: John Wiley & Sons, 2009, 534– 641

38 Wang X, Dai Y. Exergoeconomic analysis of utilizing the transcritical CO₂ cycle and the ORC for a recompression supercritical CO₂ cycle waste heat recovery: a comparative study. Applied Energy, 2016, 170 : 193– 207

39 Wu C, Wang S, Feng X, Li J. Energy, exergy and exergoeconomic analyses of a combined supercritical CO₂ recompression Brayton/absorption refrigeration cycle. Energy Conversion and Management, 2017, 148 : 360– 377