A Comparative Study of Hydrogen Perm-selective Membrane Reactors for Coupling of Ethylbenzene Dehydrogenation and Methane tri-reforming: Modeling and Optimization
Paper ID : 1166-MST2015-FULL
Azadeh Mirvakili1, malihe heravi *2, Siamak Agah Zamin1, Mohammad Reza Rahimpour1
1Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 71345, Iran
2Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 71345, fax: +98 711 6287294.
The aim of this work is to emphasize on the concept of thermally coupled membrane reactor (TCMR) in producing two precious chemicals, hydrogen and styrene, economically. TCMR is designed as a double pipe reactor where methane tri-reforming for hydrogen production is considered in the exothermic side of the reactor and styrene production reaction takes place in the endothermic side. The walls of the shell side are coated by hydrogen perm-selective membrane layers. The produced hydrogen in the endothermic side is transferred to permeation side as the generated heat in the exothermic side is transferred to the endothermic section. After model validation, in order to maximize methane and ethylbenzene conversion, proposed TCMR is optimized via differential evolution method. Optimum values of inlet temperature and molar flow rate for both sides are reported. Moreover, performance of the reactor is theoretically investigated in the presence of six type of hydrogen perm-selective membranes which are stable at operating condition. Results are compared with each other and finally it is concluded that VCr4Ti4 membrane named by TCMR5 has the highest hydrogen permeation rate. Therefore, it leads to the highest ethylbenzene conversion and styrene production in the endothermic side as well as methane conversion in the exothermic side. Also, less yield of toxic materials, benzene and toluene, proves that TCMR5 configuration is more environmentally friendly than other configurations.
Membrane reactor; Coupling concept, Styrene; Hydrogen permeation rate, Modeling and optimization.
Status : Conditional Accept (Oral Presentation)