Mohammadreza Omidkhah | Tarbiat Modares University (original) (raw)
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Papers by Mohammadreza Omidkhah
The Canadian Journal of Chemical Engineering, 2015
Journal of the Taiwan Institute of Chemical Engineers, 2015
Journal of Membrane Science, 2015
Journal of Natural Gas Science and Engineering, 2015
One of the safe and pressure relieving systems in oil and gas refineries as well as petrochemical... more One of the safe and pressure relieving systems in oil and gas refineries as well as petrochemical complexes, is the relief header with the flare stack being the last component. In this network all the excess gases are collected and sent to flare stack to be burnt. A great amount of these gas mixtures has a high heating value and in some cases it can even be used as the raw material for various units. It is clear that burning this gas mixture in flare stack causes environmental problems like air and noise pollution and also is a financial waste. In this paper a step by step approach and calculations are given to calculate and discuss flare gas recovery benefits for refineries. The method contains data gathering of flare line's composition and other conditions, simulating of data and calculate financial benefits for the case study by available equations. Therefore, Tabriz oil refinery flaring system and available equation for flare system are used as a case study. Flare gas mixtur...
The role of the feed analysis in the basic design engineering contract is studied in this article.
In this work, the cross-linked poly (vinyl alcohol)/formaldehyde with different blend composition... more In this work, the cross-linked poly (vinyl alcohol)/formaldehyde with different blend compositions (FA/PVA: 1, 3, 5 ratio%) were synthesized. In addition, different diethanolamine concentrations ranging from 15-45 wt % were investigated for membrane fabrication. Moreover, the membranes were characterized by Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) and contact angle measurement. Furthermore, the effects of crosslinking agent content, amine concentration and feed pressure on CO2/CH4 transport properties were investigated in pure gas experiments. The results showed that CO2 and CH4 permeances decreased with increasing FA/PVA mass ratio, in comparison with uncross-linked membranes, although the selevtivities increased considerably. The highest selectivity (about 92.72) was achieved from PVA/FA(5wt%)/PTFE membrane. Moreover, it was found that CO2/CH4 selectivity was significantly decreased with increasing cross-linker/PVA mass ratio from 1 wt% to 5 wt%. On...
International Journal of Greenhouse Gas Control, 2015
ABSTRACT
International Journal of Chemical Reactor Engineering, 2000
Ni/Al2O3 catalysts were synthesized by sol-gel method with various nickel loadings. Chemical and ... more Ni/Al2O3 catalysts were synthesized by sol-gel method with various nickel loadings. Chemical and physical properties of the catalysts were characterized by XRD and TPR techniques. X-ray diffraction patterns showed no peaks due to NiO species. Temperature-...
RSC Adv., 2015
ABSTRACT Olefins and paraffins are the main building blocks for many products in the petrochemica... more ABSTRACT Olefins and paraffins are the main building blocks for many products in the petrochemical industry. Various research studies have demonstrated the viability of polyimide membranes for high performance olefin/paraffin separation. Further advancements in this field require having a thorough understanding of both sorptive and diffusive factors of permeation. This research study presents an extensive analysis on using frame of reference/bulk flow and Maxwell-Stefan models in order to elaborate on the transport and prediction of the performance in the case of propylene/propane separation using polyimide membranes. Sorption data of pure gases are utilized to calculate the sorption level of gases in binary mixture. The contributions of kinetic and thermodynamic coupling effects (TCE) are assessed using Maxwell-Stefan approach. Moreover, the dual-mode diffusion coefficients are evaluated and optimized for achieving higher accuracy predictions in the case of binary gas mixture. The results reveal the significant role of thermodynamic compared to kinetic coupling effects in governing the transport properties. In overall, Maxwell-Stephan model with the contribution of TCEs offers improved predictions compared to frame of reference/bulk flow model. The findings highlight the inevitable role of taking into account the prominent interactions of feed components in model development for better prediction of performance and evaluation of propylene/propane separation unit using polyimide membranes.
Greenhouse Gases: Science and Technology, 2015
ABSTRACT
Journal of the Taiwan Institute of Chemical Engineers, 2014
Journal of Industrial and Engineering Chemistry, 2014
The Canadian Journal of Chemical Engineering, 2015
Journal of the Taiwan Institute of Chemical Engineers, 2015
Journal of Membrane Science, 2015
Journal of Natural Gas Science and Engineering, 2015
One of the safe and pressure relieving systems in oil and gas refineries as well as petrochemical... more One of the safe and pressure relieving systems in oil and gas refineries as well as petrochemical complexes, is the relief header with the flare stack being the last component. In this network all the excess gases are collected and sent to flare stack to be burnt. A great amount of these gas mixtures has a high heating value and in some cases it can even be used as the raw material for various units. It is clear that burning this gas mixture in flare stack causes environmental problems like air and noise pollution and also is a financial waste. In this paper a step by step approach and calculations are given to calculate and discuss flare gas recovery benefits for refineries. The method contains data gathering of flare line's composition and other conditions, simulating of data and calculate financial benefits for the case study by available equations. Therefore, Tabriz oil refinery flaring system and available equation for flare system are used as a case study. Flare gas mixtur...
The role of the feed analysis in the basic design engineering contract is studied in this article.
In this work, the cross-linked poly (vinyl alcohol)/formaldehyde with different blend composition... more In this work, the cross-linked poly (vinyl alcohol)/formaldehyde with different blend compositions (FA/PVA: 1, 3, 5 ratio%) were synthesized. In addition, different diethanolamine concentrations ranging from 15-45 wt % were investigated for membrane fabrication. Moreover, the membranes were characterized by Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) and contact angle measurement. Furthermore, the effects of crosslinking agent content, amine concentration and feed pressure on CO2/CH4 transport properties were investigated in pure gas experiments. The results showed that CO2 and CH4 permeances decreased with increasing FA/PVA mass ratio, in comparison with uncross-linked membranes, although the selevtivities increased considerably. The highest selectivity (about 92.72) was achieved from PVA/FA(5wt%)/PTFE membrane. Moreover, it was found that CO2/CH4 selectivity was significantly decreased with increasing cross-linker/PVA mass ratio from 1 wt% to 5 wt%. On...
International Journal of Greenhouse Gas Control, 2015
ABSTRACT
International Journal of Chemical Reactor Engineering, 2000
Ni/Al2O3 catalysts were synthesized by sol-gel method with various nickel loadings. Chemical and ... more Ni/Al2O3 catalysts were synthesized by sol-gel method with various nickel loadings. Chemical and physical properties of the catalysts were characterized by XRD and TPR techniques. X-ray diffraction patterns showed no peaks due to NiO species. Temperature-...
RSC Adv., 2015
ABSTRACT Olefins and paraffins are the main building blocks for many products in the petrochemica... more ABSTRACT Olefins and paraffins are the main building blocks for many products in the petrochemical industry. Various research studies have demonstrated the viability of polyimide membranes for high performance olefin/paraffin separation. Further advancements in this field require having a thorough understanding of both sorptive and diffusive factors of permeation. This research study presents an extensive analysis on using frame of reference/bulk flow and Maxwell-Stefan models in order to elaborate on the transport and prediction of the performance in the case of propylene/propane separation using polyimide membranes. Sorption data of pure gases are utilized to calculate the sorption level of gases in binary mixture. The contributions of kinetic and thermodynamic coupling effects (TCE) are assessed using Maxwell-Stefan approach. Moreover, the dual-mode diffusion coefficients are evaluated and optimized for achieving higher accuracy predictions in the case of binary gas mixture. The results reveal the significant role of thermodynamic compared to kinetic coupling effects in governing the transport properties. In overall, Maxwell-Stephan model with the contribution of TCEs offers improved predictions compared to frame of reference/bulk flow model. The findings highlight the inevitable role of taking into account the prominent interactions of feed components in model development for better prediction of performance and evaluation of propylene/propane separation unit using polyimide membranes.
Greenhouse Gases: Science and Technology, 2015
ABSTRACT
Journal of the Taiwan Institute of Chemical Engineers, 2014
Journal of Industrial and Engineering Chemistry, 2014