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Modification of PES/PU membrane by supercritical CO2 to enhance CO2/CH4 selectivity:Fabrication and correlation approach using RSM

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2503-2515页

作者： Misagh Ahmadi Sara Masoumi Shadi Hassanajili Feridun Esmaeilzadeh Chemical and Petroleum Engineefing School Shiraz University71348-51154 ShirazIran

Integrally skinned asymmetric gas separation membranes of polyethersulfone(PES)/polyurethane(PU) blend were prepared using supercritical CO_2(SC-CO_2) as a nonsolvent for the polymer solution. The membrane consisted of a dense and a porous layer, which were conjoined to separate CO_2 from CH_4. The FTIR, DSC, tensile and SEM tests were performed to study and characterize the membranes. The results revealed that an increase in SC-CO_2 temperature causes an increment in permeance and a decrease in membrane selectivity. Furthermore,by raising the pressure, both permeance and selectivity increased. The modified membrane with SC-CO_2 had much higher selectivity, about 5.5 times superior to the non-modified membrane. This higher selectivity performance compared to previous works was obtained by taking the advantages of both using partial miscible blend polymer due to the strong polar–polar interaction between PU PES and SC-CO_2 to fabricate the membrane. The response surface methodology(RSM) was applied to find the relationships between several explanatory variables and CO_2 and CH_4 permeance and CO_2/CH_4 selectivity as responses. Finally, the results were validated with the experimental data, which the model results were in good agreement with the available experimental data.

关键词： Polyethersulfone Polyurethane Membrane Supercritical CO2 RSM Gas separation

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Experimental and theoretical investigation of CO_(2) mass transfer enhancement of silica nanoparticles in water

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Petroleum Research 2018年第4期3卷 370-380页

作者： Soosan Farzani Tolesorkhi Feridun Esmaeilzadeh Masoud Riazi School of Chemical and Petroleum Engineering Shiraz UniversityShiraz***Iran Department of Chemical and Petroleum Engineering School of Chemical and Petroleum EngineeringEnhanced Oil and Gas Recovery InstituteAdvanced Research Group for Gas Condensate RecoveryShiraz UniversityShiraz***Iran

Nanofluids have novel characteristics that make them potentially useful for different applications.Realizing modest mass transfer enhancement in conventional nanofluids,in this study,mass-transfer of carbon dioxide in pure water and water-based nanofluids dispersed with silica nanoparticles at different initial pressures up to 15 MPa and at temperatures of 35℃ and 45℃ was investigated.Deionized water and two nanofluids at different concentrations with volume of 150 cm^(3) were used for this purpose.CO_(2) was brought in contact with each solution in a pressure-volume-temperature(PVT)cell with no mixer.Additionally,carbon dioxide diffusion coefficients at different pressures were estimated based on Fick's law.The obtained results demonstrated that water/silica nanofluid with 0.5 wt%and 0.1 wt%increased the carbon dioxide diffusion coefficient up to 39.2%and 11.9%compared to that in pure distilled water,respectively.Moreover,it was observed that the measured diffusion coefficient of carbon dioxide inwater increased with temperature rise from 35℃ to 45℃ at constant pressure.However,it could be seen that,the diffusion coefficient decreased with pressure at constant temperature.It was concluded that among the enhancement mechanisms of nanoparticles,(i.***.grazing effect and Brownian motion),Brownian motion would play the main role in mass transfer enhancement.

关键词： Nanofluid Mass transfer enhancement Carbon dioxide Diffusion coefficient Brownian motion

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An insight into the role of the association equations of states in gas hydrate modeling:a review

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Petroleum Science 2020年第5期17卷 1432-1450页

作者： Feridun Esmaeilzadeh Nazanin Hamedi Dornaz Karimipourfard Ali Rasoolzadeh Department of Chemical Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShiraz 71345Iran

Encouraged by the wide spectrum of novel applications of gas hydrates,e.g.,energy recovery,gas separation,gas storage,gas transportation,water desalination,and hydrogen hydrate as a green energy resource,as well as CO2 capturing,many scientists have focused their attention on investigating this important phenomenon.Of course,from an engineering viewpoint,the mathematical modeling of gas hydrates is of paramount importance,as anticipation of gas hydrate stability conditions is effective in the design and control of industrial processes.Overall,the thermodynamic modeling of gas hydrate can be tackled as an equilibration of three phases,i.e.,liquid,gas,and solid hydrate.The inseparable component in all hydrate systems,water,is highly polar and non-ideal,necessitating the use of more advanced equation of states(EoSs) that take into account more intermolecular forces for thermodynamic modeling of these systems.Motivated by the ever-increasing number of publications on this topic,this study aims to review the application of associating EoSs for the thermodynamic modeling of gas hydrates.Three most important hydrate-based models available in the literature including the van der Waals-Platteeuw(vdW-P) model,Chen-Guo model,and Klauda-Sandler model coupled with and SAFT EoSs were investigated and compared with cubic EoSs.It was concluded that the CPA and SAFT EoSs gave very accurate results for hydrate systems as they take into account the association interactions,which are very crucial in gas hydrate systems in which water,methanol,glycols,and other types of associating compounds are available.Moreover,it was concluded that the CPA EoS is easier to use than the SAFT-type EoSs and our suggestion for the gas hydrate systems is the CPA EoS.

关键词： Hydrate Mathematical modeling Equation of state SAFT CPA Association EoS

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Synthesis of Poly(AAm-<i>co</i>-AA) and Investigation of its Swelling Behavior: Using Response Surface Methodology (RSM)

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Modeling and Numerical Simulation of Material Science 2018年第4期8卷 65-78页

作者： Samira Heidari Jafar Saberi Doust Feridun Esmaeilzadeh School of Chemical and Petroleum Engineering Enhanced Oil and Gas Recovery Institute Enhanced Gas Condensate Recov-ery Research Group Shiraz University Shiraz Iran Petro Pars Ghodrat Company Shiraz Iran

Unwanted water production together with oil and gas production is a striking problem in oil and gas industries, and many approaches have been examined to overcome this major problem. Preformed particle gels (PPGs) showed dramatically good properties for this purpose in mature oil and gas reservoirs. In this study, we carefully synthesized an efficient series of PPGs with using a design of experiments (DOE) software. Acrylamide (AAm)/Acrylic acid (AA) mole ratio, N,N’-methylenebisacrylamide (MBA) mole percentage and swelling time were considered as key parameters to examine PPG swelling behavior. Our results presented a detailed empirical correlation, which could significantly predict the swelling capacity of PPGs in CaCl2 salt solution (200,000 ppm).

关键词： Response Surface Methodology (RSM) Optimization Synthesis Water Conformance

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A Simulation Approach for Screening of EOR Scenarios in Naturally Fractured Reservoirs

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International Journal of Geosciences 2018年第1期9卷 19-43页

作者： Ahmadreza Ejraei Bakyani Azadeh Namdarpoor Amir Nematollahi Sarvestani Abbas Daili Babak Raji Feridun Esmaeilzadeh Department of Petroleum Engineering School of Chemical Petroleum and Gas Engineering Shiraz University Shiraz Iran Department of Chemical and Petroleum Engineering School of Chemical Petroleum and Gas Engineering Shiraz University Shiraz Iran

Undoubtedly, plenty of hydrocarbon sources are located in carbonate rocks, particularly those which are naturally fractured that is still needed to study their characterization, because of their complex and unconventional behavior. Therefore, applying any processes that cause Enhancing Oil Recovery (EOR) from Naturally Fractured Reservoirs (NFR) seems necessary and useful. However, selecting the best developed scenario is always challenging. Screening criteria would determine the possibility of implementing an EOR process. While, utilizing trade marketing simulators can solve this problem. Moreover, simulation can evaluate other parameters such as water cut and gas-oil ratio. In this research, an aquifer-supported Iranian NFR with two parts that are separated to each other with a shale layer is considered in order to select the best EOR scenario. The fluid model is created using PVTi software. Various production scenarios included natural depletion, water flooding, miscible carbon dioxide injection, water-alternating-gas (WAG) injection, simultaneous water- alternating-gas (SWAG) injection, hybrid injection, and gas recycling are simulated in ECLIPSE Compositional (E300) and their recovery factor recorded as the target parameter. The developed scenarios are designed in a way that gives the optimized results, i.e. higher recovery factor, less water cut as well as the less gas-oil ratio. As a result, SWAG shows better conditions and is recommended for the further studies of the reservoir management plan in the future. Also, the role of the aquifer in the SWAG scenario is positive by creating a natural WAG in addition to the SWAG. Additionally, the average reservoir pressure through fractures reduces less in the SWAG than the other Scenarios, the oil and gas production rate reduce less in the SWAG and SWAG/ miscible gas respectively than the other scenarios. The maximum and the minimum water cut are related to the water flooding and SWAG, respectively.Finally, the simulation approach of EOR screening in NFR is bette

关键词： Naturally Fractured Reservoir Enhanced Oil Recovery Compositional Simulation Reservoir Fluid Model Water-Alternating-Gas Injection

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