Pasargad Oil Company

Tehrān, Iran

Pasargad Oil Company

Tehrān, Iran
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Jafari M.,University of Tehran | Babazadeh A.,University of Tehran | Rahi M.,Pasargad Oil Company
Journal of Materials in Civil Engineering | Year: 2017

The paper assessed the rutting and fatigue resistances of binders containing styrene butadiene styrene (SBS) and polyphosphoric acid (PPA). For this purpose, a performance grade (PG) 58-22 base binder was modified in two manners: SBS polymer and reduced SBS polymer plus PPA. The SBS content of the SBS binder and the PPA content of the SBS + PPA binders were kept constant. Two SBS + PPA binders were investigated, for which the reduced SBS contents were determined differently: one had the same continuous high-temperature PG as the SBS binder, and the other had the same viscosity at 135°C. Multiple stress creep and recovery (MSCR) tests were performed at 40 and 55°C for determining the rutting characteristic, and linear amplitude sweep (LAS) tests were performed at 25°C for determining the fatigue characteristic of the binders. To depict the nonlinearity and predict the rutting resistance more clearly, the high stress levels of 12.8 and 25.6 kPa were added to the MSCR standard procedure. A complex modulus test was also used to evaluate the effectiveness of the new test methods for the SBS and SBS + PPA binders and to relate the results to the mixtures' stiffness parameters. Based on the results, it is found that the nonlinearity caused by the high stress levels (rutting potential) and the fatigue damage of the SBS binder are less than those of the SBS + PPA binder with the same continuous PG, but are more than those of the SBS + PPA binder with the same viscosity. The results also show good correlations between the binders and mixtures tests data. © 2017 American Society of Civil Engineers.

Moghadas Nejad F.,Amirkabir University of Technology | Gholami M.,Islamic Azad University at Tehran | Naderi K.,Amirkabir University of Technology | Rahi M.,Pasargad Oil Company
Materials and Structures/Materiaux et Constructions | Year: 2015

Rutting in asphalt pavements may reduce service life and endanger the safety of highway users. In this regard, high density polyethylene (HDPE) is one of the plastomers which can be used to modify asphalt binders and to reduce permanent deformation. However storage stability is a major problem for polyethylene-modified asphalt binders. The objective of this research is to measure the rutting potential of bitumen modified with HDPE while addressing the storage stability issue by using HDPE with low molecular weight. Superpave’s rutting criteria (G*/sin δ), Shenoy’s proposed rutting parameter (G*/(1 –(1/(tg sin δ)))), zero shear viscosity, non-recoverable compliance (Jnr) and recovery parameter(R) are used to characterize the complex rutting behavior of HDPE-modified binders. The results of the storage stability test showed that melt flow index has a significant impact on the increase of the solubility of HDPE which may contribute to a better storage stability of HDPE-modified binders. The results from different rutting parameters indicate that the addition of a 7 % HDPE (by weight) to neat binder, increases the complex modulus significantly and decreases the non-recoverable compliance which results in more rutting resistance. © 2014, RILEM.

Rahi M.,Pasargad Oil Company | Fini E.H.,North Carolina A&T State University | Hajikarimi P.,Amirkabir University of Technology | Nejad F.M.,Amirkabir University of Technology
Journal of Materials in Civil Engineering | Year: 2014

Asphalt binder resistance to permanent deformation at intermediate temperature significantly affects overall pavement resistance to rutting. To enhance asphalt resistance to permanent deformation, researchers have used various modifiers and additives such as styrene butadiene styrene (SBS) block copolymer, ethylene vinyl acetate (EVA), polyvinyl acetate (PVA), styrene butadiene rubber (SBR), and natural rubber latex. In this paper, the effectiveness of modification of asphalt binder by styrene-ethylene/propylene-styrene (SEPS) in order to enhance asphalt binder's resistance to permanent deformation has been investigated using two different evaluation methods: the Superpave specification parameter, G*/sin δ, and the cross model for calculating zero shear viscosity (ZSV). The experiments were conducted using dynamic shear rheometer (DSR) frequency sweep test performed on both the neat sample and modified ones at 40, 50, and 60°C. Utilizing these two approaches, rutting resistance of modified asphalt binders are determined and then normalized using the rutting resistance of the neat asphalt binder as the control data in order to calculate the rutting resistance improvement ratio. The research results showed that regardless of the evaluation method, SEPS can significantly improve anti-rutting performance of asphalt binder. However, it was found that ranking of modified asphalt binders according to the two approaches is different. © 2014 American Society of Civil Engineers.

Hajikarimi P.,Amirkabir University of Technology | Rahi M.,Pasargad Oil Company | Moghadas Nejad F.,Amirkabir University of Technology
Road Materials and Pavement Design | Year: 2015

In this research, three different methods of rutting resistance evaluation of asphalt binders were compared using high temperature characteristics of rubber-modified binders. For this purpose, implementing dynamic shear rheometer, frequency sweep test and repeated creep and recovery test were conducted on neat and modified samples at 60°C. Rutting resistance of asphalt binders were determined by three approaches: the Superpave specification parameter, G*/sin δ, the cross model for calculating zero shear viscosity, and the Burgers model to determine viscous component of creep stiffness. Utilising these three approaches, rutting resistance of modified asphalt binders were determined and then normalised to rutting resistance of the neat asphalt binder in order to calculate rutting resistance improvement ratio. Results showed that ranking of modified asphalt binders according to three approaches is the same while the quantity of improvement was significantly different. Also, based on these methods, it was observed that crumb rubber has better anti-rutting properties than reclaimed rubber. © 2015 Taylor & Francis

Kebritchi A.,Isfahan University of Technology | Firoozifar H.,Pasargad Oil Company | Shams K.,Isfahan University of Technology | Jalali-Arani A.,Amirkabir University of Technology
Fuel | Year: 2013

The effect of pre-devulcanization and temperature in waste tire pyrolysis are investigated on pyrolysis time, yield and properties of residual Heavy Fraction Pyrolytic Oil (HFPO). A comparative pyrolysis of usual Ground Tire Rubber (GTR) and a commercial devulcanized ground tire rubber, (known as Reclaim Rubber-RR) is performed in a static-bed batch reactor at 400-600 C and the oil is distillated to light and heavy fractions. Chemical composition studies show higher amounts of aromatics in HFPO than light fraction. As a novel approach, a relationship between isotherm at max temperature and pyrolysis temperature is presented in this work. Pyrolysis time for RR is approximately half of GTR at same temperatures due to RR devulcanized nature. The solid yield is larger for GTR than RR and decreases by temperature. The liquid yield for RR is larger than GTR. Pyrolysis time and liquid yields of GTR and RR approach to each other at higher temperatures. Kinematic viscosity and flash point are larger for GTR oils in comparison with RR. FTIR shows by increasing temperature the ratio of alkanes/aromatic (I2952/I1456) decreased for HR and increased for HG. So it can be said that both oil contain similar functional groups at different concentrations depending on temperature. 1H NMR and 13C NMR spectra shows oils are a mixture of aromatics, alkanes, alkenes, alkynes and ethers or alcohols, which exist in different concentrations. Gel Permeation Chromatography (GPC) shows that pyrolysis of GTR produces oil which is heavier and broader in Mw distribution in comparison with pre-devulcanized sample (RR). Elemental analysis shows similar elemental composition of HFPOs. © 2013 Elsevier Ltd. All rights reserved.

Fini E.H.,North Carolina A&T State University | Hajikarimi P.,Amirkabir University of Technology | Rahi M.,Pasargad Oil Company | Nejad F.M.,Amirkabir University of Technology
Journal of Materials in Civil Engineering | Year: 2016

Physiochemical and rheological properties of asphalt binder are known to directly relate to asphalt pavement performance as it relates to fatigue and low temperature cracking. While other performance criteria such as rutting is also affected by binder properties, the latter is known to be also very sensitive to aggregate skeleton and mixture gradation. To enhance pavement performance, asphalt industry has commonly used various modifiers to improve binder rheological properties both before and after it is exposed to oxidative aging. Among those additives are polymers, ground tire rubber, as well as several organic and inorganic fillers. Inorganic fillers such as nano-clay and silica fume showed to be promising candidates to enhance asphalt rheology and aging behavior. Such enhancements are typically attributed to the presence of silicate platelet and silica particles. Accordingly, this paper investigates the merits of application of mesoporous silica nanoparticles in this paper referred to as nano-silica as an asphalt binder additive to enhance binder rheological properties and oxidative aging resistance. To do so, different percentages of nano-silica were added to neat asphalt binder. Asphalt binder was then exposed to short-term oxidative aging using a rolling thin film oven (RTFO). To study the distribution of nano-silica in binder as well as the change in the chemical, rheological, and morphological properties of asphalt binders due to the addition of nano-silica, the scanning electron microscopy (SEM), Superpave tests, and Fourier transform infrared spectroscopy (FTIR) were conducted. It was found that introduction of nano-silica to asphalt binder can improve the rheological properties and oxidative aging resistance of asphalt binder. © 2015 American Society of Civil Engineers.

Darbandi M.,Sharif University of Technology | Abrar B.,Sharif University of Technology | Yazdi M.K.,University of Tehran | Zeinali M.,Pasargad Oil Company | Schneider G.E.,University of Waterloo
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM | Year: 2014

In this paper, we investigate the CO emission from an oil refinery gas incinerator both theoretically and experimentally. At the beginning of this research, our collected data from this incinerator showed that the CO contamination would be far exceeding the permissible environmental standards at the stack exhaust. Therefore, we decided to perform a combined theoretical-experimental study to find a reasonable solution to reduce the CO pollution suitably. Our theoretical study showed that a reliable solution would be to increase the incinerator operating temperature. However, we needed to collect some data from this incinerator to examine if our achieved analytical solution would work correctly. In data collection procedure, we were faced with one major difficulty due to the limits of automatic system of incinerator control, which did not let us increase the incinerator temperature readily in real work conditions. As a general remedy, our suggestion was to interfere in this automatic control system and to increase its maximum possible limit of temperature. Evidently, this needed a number of considerations, which could not be performed in a short length period. As a short length remedy, we designed a number of manual control procedures, which let us examine different temporary working conditions for the incinerator. Trying different operating condition, we eventually found a suitable one with minimum CO emission from the incinerator. Although this choice resulted in an increase in the incinerator temperature and a remedy to reduce the high CO emission, it was inversely increased the incinerator fuel consumption, which is rather a negative point. Our further data collection indicated that the excess air of primary incinerator was relatively high. Therefore, we designed an automatic system of inlet air damper to adjust the inlet air, which resulted in avoiding high excess air and consequently suitable saving in the fuel consumption. The details are provided in the rest of paper. Copyright © 2014 by ASME.

Darbandi M.,Sharif University of Technology | Abrar B.,Sharif University of Technology | Barezban M.B.,Sharif University of Technology | Faridvand A.,Pasargad Oil Company | Schneider G.E.,University of Waterloo
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM | Year: 2014

Combustion emission is one of the most important issues in the design of industries. Todays' strict environmental standards have limited the productions of CO, NOx, SOx, and other hazardous pollutants from the related industries. In this work, we study a typical oil refinery incinerator, which is used to burn waste gases residue produced during bitumen production process. The waste gas mainly includes a mixture including N2, H2O-vapor, and O2 species. Additionally, there are significant amounts of CO species and CxHy droplets in the waste gas composition. The measurements show that the CO emission becomes so crucial in high flow rate of feeding waste gas to the incinerator. Here, we numerically simulate the combustion process in this incinerator by solving the full turbulent reacting flow equations. In this regard, we use the finite-volume method to solve the RANS equations. For turbulence modeling purposes, we use the two-equation k-ε model along with standard wall functions. The non-premixed combustion is simulated by solving the mixture fraction equations for both fuel and waste gas streams. The interaction between turbulence and combustion is properly considered in the current modeling. We use the P1 method to solve the radiation transfer equation in emitting and absorbing medium of combustion gasses. The WSGG model is used to consider the absorption coefficient variation. The set of governing equations are solved using a SIMPLE-based algorithm. The current solutions provide good knowledge about the mixing pattern of flue gas and air-fuel streams in the incinerator. The improper mixing in the incinerator suggests we present a new design to re-design the waste gas inlet to the incinerator. Our simulation shows that the new design would result in substantial improvement in mixing process of these two streams. We find that this new design would effectively reduce the CO ppm at the exit of incinerator's stack. Copyright © 2014 by ASME.

Firoozifar S.H.,Pasargad Oil Company | Foroutan S.,Pasargad Oil Company
Chemical Engineering Research and Design | Year: 2011

Chemical composition and any variation of four main components of bitumen (asphaltene, saturated, naphthene aromatic and polar aromatic) have effective impact on its properties and especially, thermal properties. In other words, in order to have asphalt pavements with reasonable temperature susceptibility and thermal stability, first of all it is essential to know the effect of these components on bitumen properties. Therefore, in this research these effects were investigated and it was found that penetration index (PI) and penetration viscosity number (PVN) of bitumen were increased with increasing in asphaltene content.Thermal behavior of bitumen in an oxidizing environment was also studied using thermogravimetric analysis (TGA) technique. The results showed that increasing the asphaltene content of bitumen decreases the temperature susceptibility and improves the resistance of samples to thermal decomposition. © 2011 The Institution of Chemical Engineers.

Kazemi Esfeh H.,Islamic Azad University at Mahshahr | Ghanavati B.,Islamic Azad University at Mahshahr | Shojaei Arani R.,Pasargad Oil Company
ICCCE 2010 - 2010 International Conference on Chemistry and Chemical Engineering, Proceedings | Year: 2010

Need to proper roads and highways will increase with increasing automotive industry and development of cities and countries. Among petroleum products used in road construction and asphalt application for soil stability and adhesion between layers of asphalt are bitumen soluble and Bitumen Emulsions. Bitumen Emulsions are subset of water emulsion that in this type of emulsion dispersed phase is lipophilic and continuous phase is hydrophilic, for mixing these two phases used surface activating agents called emulsifier. Bitumen Emulsions are under other similar emulsion laws hence; basically Bitumen Emulsions from Thermodynamic point of view are unstable fluid and disperse. Considering the importance and benefits of using Bitumen Emulsions, this paper tries to show influence of various factors such as emulsion source, type and amount of emulsifier, particles size of emulsion and other properties of the emulsions are determined. © 2010 IEEE.

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