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RISS 인기검색어
- 검색키워드
- 저자 : Seyed Heydar Rajaee Shooshtari (검색결과 3 건)
- 무료
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Seyed Heydar Rajaee Shooshtari,Akbar Shahsavand 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
Proper correction of water and heavy hydrocarbon dew points of sweet natural gases is essential from vari-ous technical and economical standpoints. Supersonic separators (3S) are proved to be capable of achieving these taskswith maximum reliability and minimal expenses. The majority of the previous articles have focused on the flow behaviorof pure fluids across a 3S unit. Multicomponent fluid flow inside 3S accompanied with condensation phenomenonwill drastically increase the complexity of the simulation process. We tackle this issue by considering a proper com-bination of fundamental governing equations and phase equilibrium calculations to predict various operating conditionsand composition profiles across two multi-component and multi-phase 3S units. Various Iranian sweet gases are usedas real case studies to demonstrate the importance of 3S unit practical applications. Simulation results clearly illustratethe effectiveness of 3S units for faithful dehydration of various natural gases, while successfully controlling its dewpoint, suitable for any practical applications. Conventional HYSYS simulation software is used to validate the simulationresults.
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Shooshtari Seyed Heydar Rajaee,Bastani Kiarash,Eslampanah Hamidreza 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.12
The modified Claus process is one of the most commonly used methods for hydrogen sulfide conversion into sulfur. However, one of the problems of this unit is the presence of benzene, toluene, and xylene (BTX) compounds at the inlet of the catalytic reactors that can deactivate the catalyst and decrease the efficiency of the sulfur recovery unit. One of the methods of BTX destruction in a furnace is to increase its temperature by increasing the oxygen concentration in the inlet air. In the present work, the application of polymeric membranes for the destruction of BTX was investigated by modeling and simulating a sulfur recovery unit and a membrane unit. The numerical results obtained from the simulations were validated successfully with industrial and experimental data for both sulfur recovery and membrane units. The simulation results for an industrial case study indicate that using five PI carbon membrane units with a total area of 26.82 m2 can increase the concentration of oxygen in the inlet air to a level of 60%. In this condition, the reduction in BTX compounds can also be increased up to 59%. Furthermore, for two-stage membrane configuration, by employing five two-stage membrane units with a total area of 58.3m2, the oxygen concentration increases to 82%, and the reduction in BTX compounds will be 75%.
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Modeling of gas permeation through mixed matrix membranes using a comprehensive computational method
Majid Pakizeh,Salman Ofoghi,Seyed Heydar Rajaee Shooshtari 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.11
Three different morphologies can occur at the interface of inorganic and polymeric phases in mixed matrix membranes (MMMs). These morphologies are characterized by their different parameters such as partial pore blockage factor (α), polymer chain rigidification factor (β), and thickness of rigidified layer or void region. In this study, the morphology of three MMMs has been evaluated using a comprehensive computational method. The average absolute relative error (%AARE) is used as a criterion for optimizing three various MMM morphological parameters. According to the obtained optimum parameters, it was confirmed that two MMMs of C60/Matrimid and PVAc-Zeolite 4A have pore blockage and polymer chain rigidified defects. The results show that the morphology of ZIF-8/6FDA-DAM can be considered as an ideal morphology. After obtaining the morphological parameters, the permeability of the studied MMMs was predicted based on the modified Maxwell model and good agreement was observed between the calculated value and the experimental data.
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