176. Nanocomposite Coating Based on Thermoplastic Acrylic Resin and Montmorillonite Clay: Preparation and Corrosion Prevention Properties

Mohammadreza Shishesaz; Davood Jafari; davood zaarei; Iman Danaee

Volume 6, Issue 1 , Winter 2017, , Pages 63-76

http://dx.doi.org/10.22050/ijogst.2017.44382

Abstract
  Different amounts of nanoclay were incorporated into the acrylic resin matrix at 0, 1, 3, and 5 wt.% loadings. The coatings were applied on low carbon steel plates. Optical microscopy, sedimentation test, transmission electron microscopy, and X-ray diffraction were employed to investigate the dispersion ...  Read More

Geophysics
177. Using a novel method for random noise reduction of seismic records

Majid Bagheri; Mohammad Ali Riahi

Volume 7, Issue 3 , Summer 2018, , Pages 65-72

http://dx.doi.org/10.22050/ijogst.2018.75178.1381

Abstract
  Random or incoherent noise is an important type of seismic noise, which can seriously affect the quality of the data. Therefore, decreasing the level of this category of noises is necessary for increasing the signal-to-noise ratio (SNR) of seismic records. Random noises and other events overlap each ...  Read More

178. Measurement of Mass Transfer Coefficients of Natural Gas Mixture during Gas Hydrate Formation

Vahid Mohebbi; Reza Mosayebi Behbahani

Volume 4, Issue 1 , Winter 2015, , Pages 66-80

http://dx.doi.org/10.22050/ijogst.2015.8616

Abstract
  In this study, mass transfer coefficients (MTC’s) of natural gas components during hydrate formation are reported. This work is based on the assumption that the transport of gas molecules from gas phase to aqueous phase is dominant among other resistances. Several experiments were conducted on ...  Read More

179. Studying the Effect of the Concentration of PTFE Nanoparticles on the Tribological Behavior of Ni-P-PTFE Composite Coatings

Hamid Rahmati; Farzad Mahboobi

Volume 4, Issue 4 , Autumn 2015, , Pages 67-75

http://dx.doi.org/10.22050/ijogst.2016.12480

Abstract
  In the past 30 years, electroless nickel (EN) plating has grown to such proportions that these coatings and their applications are now found underground, in outer space, and in a myriad of areas in between. Moreover, in order to further improve the mechanical and tribological properties of the nickel-phosphorous ...  Read More

Chemical Engineering
180. CFD Simulation of Parameters Affecting Hydrodynamics of Packed Beds: Effects of Particle Shape, Bed Size, and Bed Length

Saeid Mohammadmahdi; Ali Reza Miroliaei

Volume 8, Issue 1 , Winter 2019, , Pages 78-102

http://dx.doi.org/10.22050/ijogst.2018.104379.1418

Abstract
  Packed bed reactors have many applications in different industries such as chemical, petrochemical, and refinery industries. In this work, the effects of some parameters such as the shape and size of particles, bed size, and bed length on the hydrodynamics of the packed beds containing three spherical, ...  Read More

Chemical Engineering
181. Catalytic Oxidation of Carbon Monoxide by Cobalt Oxide Catalysts Supported on Oxidized-MWCNT

Mahnaz Pourkhalil; Saeideh Tasharrofi

Volume 7, Issue 2 , Spring 2018, , Pages 79-90

http://dx.doi.org/10.22050/ijogst.2017.105780.1421

Abstract
  Cobalt oxide catalysts supported on oxidized multi-walled carbon nanotubes (MWCNT) for the low-temperature catalytic oxidation of carbon monoxide were prepared by an impregnation-ultrasound method. These catalysts were characterized by N2 adsorption/desorption, TEM, XRD, Raman, and H2-TPR methods. The ...  Read More

Chemical Engineering – Gas Processing and Transmission
182. An Experimental and Theoretical Analysis of Foam Formation in the Sour Gas Sweetening Process

Mahmod Fatemi; Bahram Hashemi Shahraki

Volume 7, Issue 4 , Autumn 2018, , Pages 79-89

http://dx.doi.org/10.22050/ijogst.2018.111128.1430

Abstract
  Use of amine solutions for the removal of acid gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S) from natural gas is the most common method, and, in this process, operational problems because of foaming are reported. Foaming can lead to the entrainment of liquid into downstream process equipment ...  Read More

Chemical Engineering
183. Mathematical Modeling and Numerical Simulation of CO2 Removal by Using Hollow Fiber Membrane Contactors

Mohammad Mesbah; Masumeh Jafari; Ebrahim Soroush; Shohreh Shahsavari

Volume 6, Issue 4 , Autumn 2017, , Pages 80-96

http://dx.doi.org/10.22050/ijogst.2017.53913

Abstract
  Abstract In this study, a mathematical model is proposed for CO2 separation from N2/CO2 mixtureusing a hollow fiber membrane contactor by various absorbents. The contactor assumed as non-wetted membrane; radial and axial diffusions were also considered in the model development. The governing equations ...  Read More

184. Hydroisomerization of n-Pentane over Pt/Mordenite Catalyst: Effect of Feed Composition and Process Conditions

Behrouz Bayati; Mahboobeh Ejtemaei; Nazanin Charchi Aghdam; Ali Akbar Babaluo; Mohammad Haghighi; Amir Sharafi

Volume 5, Issue 2 , Spring 2016, , Pages 84-99

http://dx.doi.org/10.22050/ijogst.2016.15800

Abstract
  The hydroisomerization of pure n-pentane over H-mordenite supported Pt-catalyst was investigated in a fixed bed reactor by changing reaction parameters such as temperature, pressure, and WHSV, as well as the H2/HC ratio. The maximum yield of isopentane over Pt/mordenite catalyst was achieved at 220 °C ...  Read More

Chemical Engineering
185. Prediction of Dispersed Phase Holdup in the Kühni Extraction Column Using a New Experimental Correlation and Artificial Neural Network

Mohsen Keshavarz; Ahad Ghaemi; Mansour Shirvani; Ebrahim Arab

Volume 8, Issue 4 , Autumn 2019, , Pages 85-105

http://dx.doi.org/10.22050/ijogst.2018.143946.1472

Abstract
  In this work, the dispersed phase holdup in a Kühni extraction column is predicted using intelligent methods and a new empirical correlation. Intelligent techniques, including multilayer perceptron and radial basis functions network are used in the prediction of the dispersed phase holdup. To design ...  Read More

Petroleum Engineering
186. Geochemical Characterization of Kazhdumi Source Rock in the Khaviz Oil Field, Southwest of Iran, Using Rock-Eval Pyrolysis

Mehrbod khalatbari; Mohammadreza Kamali; Mehran Arian; Buyuk Ghorbani

Volume 9, Issue 1 , Winter 2020, , Pages 85-93

http://dx.doi.org/10.22050/ijogst.2019.187983.1508

Abstract
  The Khaviz oil field located in Dezful embayment is one of Iran’s southwest oil fields. In this study, a total of 28 cutting samples from Kazhdumi formation (well No. KZ1, Khaviz oil field) were subject to geochemical investigation using Rock-Eval pyrolysis for the first time. The results of pyrolysis ...  Read More

187. Investigating the Solubility of CO2 in the Solution of Aqueous K2CO3 Using Wilson-NRF Model

Reza Moradi; Seyed Hossein Mazloumi

Volume 8, Issue 3 , Summer 2019, , Pages 89-100

http://dx.doi.org/10.22050/ijogst.2018.122093.1443

Abstract
  Hot potassium carbonate (PC) solution in comparison with amine solution had a decreased energy of regeneration and a high chemical solubility of . To present vapor and liquid equation (VLE) of this system and predict  solubility, the ion specific non-electrolyte Wilson-NRF local composition model ...  Read More

Petroleum Engineering – Reservoir
188. Experimental Investigation Used of Albizia Julibrissin Extract as a Plant Surfactant on Oil Recovery

Seyed Reza Shadizadeh; Seyed Ramin Seyedi Abandankashi; Siyamak Moradi

Volume 10, Issue 1 , Winter 2021, , Pages 89-106

http://dx.doi.org/10.22050/ijogst.2021.234857.1555

Abstract
  In recent years, the use of natural surfactants as surface active agents in chemical methods of oil recovery over chemical surfactants has been under consideration due to the absence of environmental problems. In this study, a new plant, Albizia julibressin (Albizia), was introduced as a natural surfactant. ...  Read More

Mechanical Engineering – Applied Design
189. Investigating the Effectiveness of a Composite Patch on Repairing Pipes Subjected to Circumferential Cracks under Combined Loadings

Gholamreza Rashed; Hadi Eskandari; Ardeshir Savari

Volume 8, Issue 2 , Spring 2019, , Pages 92-106

http://dx.doi.org/10.22050/ijogst.2018.146737.1474

Abstract
  The purpose of this study is to investigate bending moment and the axial load capacity of a pressurized pipe suffering from a through-wall circumferential crack repaired by a composite sleeve. The three-dimensional finite element method (FEM) was adopted to compute the results, and the failure assessment ...  Read More

Chemical Engineering
190. A Numerical Study on Using Air Cooler Heat Exchanger for Low Grade Energy Recovery from Exhaust Flue Gas in Natural Gas Pressure Reduction Stations

Mansoor Naderi; Ghasem Zargar; Ebrahim Khalili

Volume 7, Issue 1 , Winter 2018, , Pages 93-109

http://dx.doi.org/10.22050/ijogst.2018.55741

Abstract
  Heat EXchangers (HEX) that are used in City Gate Station (CGS) systems are modeled numerically to recover the exhaust waste heat. It was tried to find the best viscous model to obtain results in accordance with experimental results and to change the heat exchanger design. This HEX is used for recovering ...  Read More

Chemical Engineering
191. A Robust Method to Predict Equilibrium and Kinetics of Sulfur and Nitrogen Compounds Adsorption from Liquid Fuel on Mesoporous Material

Mohammadreza Khosravi-Nikou; Ahmad Shariati; Mohammad Mohammadian; Ali Barati; Adel Najafi-Marghmaleki

Volume 9, Issue 2 , Spring 2020, , Pages 93-118

http://dx.doi.org/10.22050/ijogst.2019.147638.1477

Abstract
  This study presents a robust and rigorous method based on intelligent models, namely radial basis function networks optimized by particle swarm optimization (PSO-RBF), multilayer perceptron neural networks (MLP-NNs), and adaptive neuro-fuzzy inference system optimized by particle swarm optimization methods ...  Read More

192. Resonance Ultrasonic Spectroscopy of a Nanofibrous Composite and Studying the Effect of Surface/Interface

Kobra Kalvandi; Sina Sodagar

Volume 3, Issue 1 , Winter 2014, , Pages 54-64

http://dx.doi.org/10.22050/ijogst.2014.5815

Abstract
  Resonances are intrinsic characteristics of an elastic object, which are completely independent of the source of excitation. The appropriate utilization of the information contained within the resonance spectra and the identification of the resonance frequencies of the object can be used as a potent ...  Read More

Chemical Engineering
193. An Experimental Investigation of Reactive Absorption of Carbon Dioxide into an Aqueous NH3/H2O/NaOH Solution

Ahad Ghaemi; Vahid Hashemzadeh; Shahrokh Shahhosseini

Volume 6, Issue 3 , Summer 2017, , Pages 55-67

http://dx.doi.org/10.22050/ijogst.2017.57858

Abstract
  In this research, the reactive absorption of carbon dioxide in an aqueous solution of NH3, H2O, and NaOH has experimentally been investigated. The experiments were carried out in an absorption pilot plant in different operational conditions. The composition and temperature of both gas and liquid phases ...  Read More

194. Effect of Water/Alkoxide Molar Ratio on the Synthesis Process and Electrochemical Behavior of Yttria-doped Zirconia Sol-gel Films

Samaneh Rezaee; Gholamreza Rashed; Mohammad Ali Golozar

Volume 2, Issue 1 , Winter 2013, , Pages 57-70

http://dx.doi.org/10.22050/ijogst.2013.3038

Abstract
  The aim of this work is to synthesize and investigate the performance of yttria-doped zirconia solgel coatings in the chemical corrosion prevention of zircaloy-4 (zirconium alloy) in a 1 N H2SO4 environment. The influence of four different molar ratios of water to alkoxide, namely 1, 4, 12, and 20, on ...  Read More

195. Fluid Injection Optimization Using Modified Global Dynamic Harmony Search

Mohammad Khalili; Riyaz Kharrat; Karim Salahshoor; Morteza Haghighat sefat

Volume 2, Issue 3 , Summer 2013, , Pages 57-72

http://dx.doi.org/10.22050/ijogst.2013.3645

Abstract
  One of the mostly used enhanced oil recovery methods is the injection of water or gas under pressure to maintain or reverse the declining pressure in a reservoir. Several parameters should be optimized in a fluid injection process. The usual optimizing methods evaluate several scenarios to find the best ...  Read More

196. A New Method for Multisensor Data Fusion Based on Wavelet Transform in a Chemical Plant

Karim Salahshoor; Mohammad Ghesmat; Mohammad Reza Shishesaz

Volume 3, Issue 3 , Summer 2014, , Pages 62-74

http://dx.doi.org/10.22050/ijogst.2014.6622

Abstract
  This paper presents a new multi-sensor data fusion method based on the combination of wavelet transform (WT) and extended Kalman filter (EKF). Input data are first filtered by a wavelet transform via Daubechies wavelet “db4” functions and the filtered data are then fused based on variance ...  Read More

197. Failure Investigation of Hydrogen Blistering on Low-strength Carbon Steel

Elahe Shekari; Mohammad Reza Shishesaz; Gholamreza Rashed; Mansoor Farzam; E Khayer

Volume 2, Issue 2 , Spring 2013, , Pages 65-76

http://dx.doi.org/10.22050/ijogst.2013.3538

Abstract
  The current study assesses the root causes of hydrogen blisters on low strength carbon steel equipment. For this purpose, some experiments including hardness test, non-destructive test (NDT), metallography, and fractograpghy are conducted. The microstructure of two blisters is assessed by means of optical ...  Read More

198. Effects of Surface Treatment on Corrosion Resistance of 304L and 316L Stainless Steel Implants in Hank’s Solution

Saeid Ghanavati; Mohammad Reza Shishesaz; Mansoor Farzam; Iman Danaee

Volume 5, Issue 1 , Winter 2016, , Pages 65-72

http://dx.doi.org/10.22050/ijogst.2016.13830

Abstract
  The enormous demands for metal implant have given rise to a search for cheap material with good bio-tolerability and resistance to corrosion. Although stainless steel has these properties and is widely used for this purpose, its long term application is still a concern. The corrosion resistance of stainless ...  Read More

199. Power Consumption Minimization of Khormoj Compressor Station

Javid Haddad; Reza Mosayebi Behbahani; Mohammadreza Shishesaz

Volume 3, Issue 2 , Spring 2014, , Pages 66-78

http://dx.doi.org/10.22050/ijogst.2014.6037

Abstract
  Arguably, the natural gas transmission pipeline infrastructure in Iran represents one of the largest and most complex mechanical systems in the world. The optimization of large gas trunk lines known as IGAT results in reduced fuel consumption or higher capability and improves pipeline operation. In the ...  Read More

200. DME Synthesis over MSU-S Catalyst through Methanol Dehydration Reaction

Hamed Rashidi; Touba Hamoule; Mohammad Reza Khosravi Nikou; Ahmad Shariati

Volume 2, Issue 4 , Autumn 2013, , Pages 67-73

http://dx.doi.org/10.22050/ijogst.2013.4797

Abstract
  MSU-S mesoporous catalyst with [SiO2]/[Al2O3] ratio of 55 was synthesized using tetrapropylammonium hydroxide (TPAOH) as a structure directing agent and hexadecyltrimethylammonium bromide (CTAB) as a surfactant. The catalytic activity of the calcined sample was evaluated for the dehydration of methanol ...  Read More