Vahid Abkhiz

National Iranian Oil Company (Iran)

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Azam Marjani

Islamic Azad University, Arak

Isa Heydari

Petroleum University of Technology

Farzad Fadaei

Sharif University of Technology

Seyyed Salar Meshkat

Urmia University of Technology

Ali Naderi

Atatürk University

Zeinab Hosseini Dastgerdi

Urmia University of Technology

Amin Kordestani

Petroleum University of Technology

Mehdi Ghadiri

Islamic Azad University South Tehran Branch

S.H. Najibi

Petroleum University of Technology

Mehdi Parvini

Semnan University

Cooperative Institutions

Petroleum University of Technology

Islamic Azad University, Arak

Sharif University of Technology

Iran University of Science and Technology

Urmia University of Technology

Islamic Azad University, Tehran

Semnan University

University of Tehran

Isfahan University of Technology

Atatürk University

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Comparison of amine solutions performance for gas sweetening

Asia-Pacific Journal of Chemical Engineering (2014)

Vahid Abkhiz Isa Heydari

ABSTRACT Using different kinds of amines, in Fajr‐e‐Jam gas refinery, including mixed or activated amines, have provided the chance for better analysis of different kinds of amines performance. In the current work, the most important parameters in gas sweetening refineries such as amine circulation rate, steam consumption, CO 2 and mercaptan removal were investigated for sweetening trains utilizing diethanolamine (DEA), methyldiethanolamine (MDEA), DEA/MDEA and activated methyldiethanolamine (aMDEA). In the case of steam consumption and circulation rates, MDEA and aMDEA, show the less required rates to meet lean amine loadings. For CO 2 removal aMDEA has the best efficiency. In the case of mercaptan removal, DEA shows the best absorption rate compared with other three amines. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.

Diethanolamine

Sweetening

Refinery

Sour gas

Co2 removal

10.1002/apj.1795

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Citations (18)

Simulation of Membrane Distillation for Purifying Water Containing 1,1,1‐Trichloroethane

Chemical Engineering & Technology (2014)

Mehdi Ghadiri Vahid Abkhiz Mehdi Parvini Azam Marjani

Abstract Vacuum membrane distillation is modeled for the purification of water containing organic matter. The separation medium is a hollow‐fiber membrane contactor that is simplified to a two‐dimensional structure with a single porous membrane wall. The model considers the transport phenomena of a vacuum membrane distillation system in porous media, in which the aqueous volatile organic solution was considered as an incompressible and steady fluid. The numerical simulation of the two‐dimensional model of vacuum membrane distillation for an aqueous solution of 1,1,1‐trichloroethane was established under steady state. The effects of the bulk feed temperature and the feed flow rate on the percentage of 1,1,1‐trichloroethane removal from an aqueous solution are discussed.

Membrane Distillation

Hollow fiber membrane

Contactor

10.1002/ceat.201300473

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Citations (15)

Preparation of novel magnetic grafted raft agent nanocomposite: Application in carmine dye adsorptive removal from waste water

Journal of environmental chemical engineering (2019)

Zeinab Hosseini Dastgerdi Vahid Abkhiz Seyyed Salar Meshkat Naser Ghorbani

Endothermic process

Langmuir adsorption model

Raft

10.1016/j.jece.2019.103109

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Citations (18)

Computational simulation of gas separation using nonporous polymeric membranes: Experimental and theoretical studies

Polymer Engineering and Science (2014)

Azam Marjani Vahid Abkhiz Farzad Fadaei

In this study, preparation and simulation of polydimethylsiloxane (PDMS) membranes for gas separation is carried out. The membranes are synthesized by solution‐casting method via silicon oil as precursor. Gas permeation experiments for single gases of CH 4 and N 2 were conducted at different feed pressures (2–10 bars). PDMS membrane as a rubbery polymer showed that are more permeable toward more condensable gases, i.e., CH 4 compared to N 2 . It was indicated that increasing feed pressure enhances permeability of CH 4 through the membrane slightly, but the permeability of nitrogen was almost constant over enhancement of feed pressure. Moreover, a mathematical model was developed to predict the permeation of gases across PDMS membrane. The model is based on solving conservation equations for gases in the membrane phase. Finite element analysis was utilized for numerical simulation of the governing equations. The simulation results were used to predict the concentration of gases inside the membrane. POLYM. ENG. SCI., 55:54–59, 2015. © 2014 Society of Plastics Engineers

Polydimethylsiloxane

10.1002/pen.23865

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Citations (3)

Experimental investigation of hydrate formation in a high pressure cell and comparison of the results with thermodynamic models

International Conference on Chemistry and Chemical Engineering (2010)

S.H. Najibi Vahid Abkhiz Ali Naderi Amin Kordestani

Natural gas is rapidly growing in global importance both as a primary energy source and a feedstock for downstream industry. Natural gas produced from reservoirs, usually coexist with formation water. At the proper conditions of pressure and temperature, coexistence of water with the small size molecules in natural gas, may lead to gas hydrate formation. Gas hydrates are solid crystalline compounds stabilized by the inclusion of suitably sized gas molecules inside cavities formed by water molecules through hydrogen bonding. Good thermodynamic models have been developed to predict hydrate dissociation conditions, but due to some uncertainties still the experimental study of this phenomenon is needed. In this study, an experimental test rig has been designed and installed for the measurement of hydrate dissociation conditions. Measurements can be made for pressures up to 50 MPa for different gas samples in the presence of pure water and inhibitors. To check the validity of the results obtained from this test rig, the hydrate dissociation temperature for a nitrogen gas sample has been measured for a pressure of 17.971 MPa (2607.25 psia). The measured data is compared with the predictions of three well known thermodynamic models. The results show that there is a good agreement between measured data and the predictions.

Clathrate hydrate

10.1109/iccceng.2010.5560392

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Operational Investigation of Multi Feed Amine Process Performance in Comparison with Conventional Process

International Journal of Oil Gas and Coal Engineering (2014)

Vahid Abkhiz

The alkanolamines are the most generally accepted and widely used of the many available solvents for removal of acid gases from natural gas streams. Amongst different amine sweetening processes like conventional scheme, split flow, absorbers in series or parallel and multi feed, selecting the proper scheme has great impact on acid gas removal. Using multi feed scheme in Fajr-e-Jam gas refinery has provided the chance for better analysis of conventional and multi feed schemes. In current work, the most important parameters in gas sweetening refineries like CO2, H2S and mercaptan removal, caustic solution consumption and temperature distribution throughout the absorption column were investigated for sweetening trains utilizing DEA. For all the parameters mentioned above, multi feed scheme shows good acid gas removal capability and lower causted solution consumption compared to the conventional process with single feed.

Refinery

Sour gas

Sweetening

Acid gas

10.11648/j.ogce.20140206.11

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Citations (4)