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thermal-crackings
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Generation, management and optimization of thermal cracking reaction network for hydrocarbons by Bond-Electron matrix
, Article Scientia Iranica ; Volume 10, Issue 3 , 2003 , Pages 322-328 ; 10263098 (ISSN) ; Mowla, D ; Khorasheh, F ; Sharif University of Technology
Sharif University of Technology
2003
Abstract
In this paper, an object oriented method is developed for generation, optimization and management of a hydrocarbon (CxHy) pyrolysis reaction network using a Bond-Electron (BE) matrix. A computer program was developed using C++ language. This program can provide and generate a pyrolysis reaction network for a wide range of hydrocarbons, including alkanes, olefins, diolefins, cyclic and aromatic compounds, using the linear notation structure of the reactant species. Furthermore, the reaction patterns and pruning methods are considered and a new method is presented for identification of reactants and products. The structural identification of species contained in the network allows one to...
Accelerated heat transfer in thermal cracking reactor tubes: the time for sinusoidal corrugated configuration
, Article Brazilian Journal of Chemical Engineering ; 2022 ; 01046632 (ISSN) ; Ardjmand, M ; Towfighi Darian, J ; Khorasheh, F ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2022
Abstract
Olefin industry came to a commercialization maturity, but still energy consumption, coke formation and thermal cracking optimization seem hot debates. The typical use of static mixers or fins inside the pipes itself leads to significant pressure drop, leading to higher power consumption and lower selectivity of olefins production. Herein we propose an innovative approach, i.e., accelerated sinusoidal heat transfer through mixing at viscous sublayer pipe-fluid interface. CFD simulation by SOLIDWORKS, ANSYS FLUENT computer-aided computations visualized hydrodynamic wave effects on heat transfer in corrugated tube taking bare tubes as reference. The length and outside diameter of tube were...
Optimization of coil outlet temperature for producing maximum products in an olefin furnace
, Article Petroleum Science and Technology ; Volume 31, Issue 6 , Feb , 2013 , Pages 596-602 ; 10916466 (ISSN) ; Fakhrhoseini, S. M ; Ghiassi, H ; Sharif University of Technology
2013
Abstract
The bulk of the worldwide annual commercial production of ethylene is based on thermal cracking of petroleum hydrocarbons with steam. In this research, the effect of coil outlet temperature on the reactor yield has been studied. In order to investigate a reliable mathematical correlation, several data points were obtained by adjusting coil outlet temperature in a real plant. In order to investigate best coil outlet temperature, an objective function was represented. Based on the obtained mathematical correlation and the assumed objective function, it was found that best coil outlet temperature for investigating maximum income is 1,128 K
The Effect of Operating Conditions of Solvent Deasphalting Process on the Characteristics of Coke Produced under Thermal Cracking
, M.Sc. Thesis Sharif University of Technology ; Khorashe, Farhad (Supervisor) ; Ivakpour, Javad (Supervisor)
Abstract
Du to depletion of conventional petroleum reserves, the oil industry is faced with the challenge of developing technologies for processing heavy crude oil and petroleum residues that contain large amounts of asphaltenes and heavy metals including vanadium, nickel, and iron. So increasing need for processing of petroleum residues and full advantage of them in cases such as catalytic cracking and hydrogen units and also high-grade coke production in industries such as aluminum to be felt. In this work we used the vacuum distillation residue of Abadan heavy crude oil refinery in a solvent deasphalting (SDA) process at different temperatures (60 to 120 °C), pressures (5 ,7 and 9 bar), solvents...
Investigation of the Effect of Aluminum Additives on the Properties and Yield of Coke in Thermal Cracking of Residue
, M.Sc. Thesis Sharif University of Technology ; Khorasheh, Farhad (Supervisor) ; Ivakpour, Javad (Supervisor)
Abstract
Demand for the petroleum products is continuously increasing. Crude oil cannot be used as it is extracted, so that, there should be some treatment that may ended up producing heavy hydrocarbons. Therefore, refineries are searching for developing new technologies for upgrading those heavy materials and convert more and more bottom-of-the-barrel into high value distillate. Amongst the different residua upgrading processes, thermal upgrading processes are of the most interest and account for over 60% of total residua processing capacity. In this work, we investigate the effect of different additives in a delayed coking process. We used vacuum distillation residue of Abadan heavy crude oil...
An optimized thermal cracking approach for onsite upgrading of bitumen
, Article Fuel ; Volume 307 , 2022 ; 00162361 (ISSN) ; Kaminski, T ; Husein, M. M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Onsite partial upgrading is a promising strategy for facilitating pipeline transportation of bitumen without the use of diluent. In the present work, a one-step treatment using an autoclave is optimized toward upgrading Alberta bitumen of 9.6 API gravity and 925,000 cP viscosity. The thermal cracking process was kept simple in order to maintain an economic and environmental advantage. Optimum conditions entailed 75 min of reaction time at 420 °C, without quenching the reactor. These conditions corresponded to highest centrifuged oil product yield of 73.3 ± 1.1 wt%, viscosity of 34 ± 2 cP and API gravity of 18.9 ± 0.5. H-NMR, CHNS and FTIR measurements revealed thermally cracked asphaltenes...
Thermal Analysis of RCC Dams During Construction and Operation
, M.Sc. Thesis Sharif University of Technology ; Ghaemian, Mohsen (Supervisor)
Abstract
The most important issues in massive concrete structures such as concrete dams are the increase in temperature due to heat generated by the dam Hydration of cement in concrete. Internal restrains are created from thermal gradient between the surface and the interior of the structure. External restrains are created from connections between structures and foundation for obstruct the movement of concrete structures due to temperature change. External restrains and internal creates tensile stresses in the concrete considerable, which can lead to thermal cracks in the structure. To prevent or minimize the possibility of cracks are examined thermal studies for the design of reinforced concrete...
Effect of Operating Conditions and Additives on the Product Yield and Sulfur Content in Thermal Cracking of a Vacuum Residue from the Abadan Refinery
, Article Energy and Fuels ; Volume 29, Issue 8 , 2015 , Pages 5452-5457 ; 08870624 (ISSN) ; Ivakpour, J ; Khorasheh, F ; Sharif University of Technology
American Chemical Society
2015
Abstract
Thermal cracking of a vacuum distillation residue of the Abadan refinery in Iran was performed under delayed coking conditions to investigate the effect of operating conditions on the yield and sulfur content of products. At reaction temperatures of 440-500 °C and pressures of 1, 3, and 5 bar, the products included gases, liquids, and coke. The yields of liquid products were higher at 1 bar compared to those for higher pressures. Increasing the reaction temperature at a given reaction pressure led to an increase in the yield of liquid products. Increasing the reaction pressure at a given reaction temperature led to higher yields of coke and gases as well as a decrease in the sulfur content...
Improvement of the thermal cracking product quality of heavy vacuum residue using solvent deasphalting pretreatment
, Article Energy and Fuels ; Volume 30, Issue 12 , 2016 , Pages 10322-10329 ; 08870624 (ISSN) ; Khorasheh, F ; Ivakpour, J ; Mohammadzadeh, A ; Sharif University of Technology
American Chemical Society
2016
Abstract
In this work we used the vacuum distillation residue from an Iranian heavy crude oil refinery in a solvent deasphalting (SDA) process using different temperatures (60-120°C), pressures (5-9 bar), solvents (n-pentane and ethyl acetate), and solvent to feed ratios (3 to 1, 5 to 1, and 7 to 1). The resulting products included deasphalted oil (DAO) and residue (PITCH). The DAO yields in SDA when n-pentane was used as solvent were significantly higher than those when ethyl acetate was used as solvent. The DAO was subsequently processed by thermal cracking at 500°C and atmospheric pressure to investigate the effect of solvent deasphalting processing conditions on the yield of coke and liquid...
On the introduction of a qualitative variable to the neural network for reactor modeling: Feed type
, Article Industrial and Engineering Chemistry Research ; Volume 48, Issue 8 , 2009 , Pages 3820-3824 ; 08885885 (ISSN) ; Mehdizadeh, H ; Bozorgmehry Boozarjomehry, R ; Towfighi Darian, J ; Sharif University of Technology
2009
Abstract
Thermal cracking of hydrocarbons converts them into valuable materials in the petrochemical industries. Multiplicity of the reaction routes and complexity of the mathematical approach has led us use a kind of black-box modelingsartificial neural networks. Reactor feed type plays an essential role on the product qualities. Feed type is a qualitative character. In this paper, a method is presented to introduce a range of petroleum fractions to the neural network. To introduce petroleum cuts with final boiling points of 865 °F maximum to the neural network, a real component substitute mixture is made from the original mixture. Such substitute mixture is fully defined, it has a chemical...
Wear and thermal effects in low modulus polymer-based composite friction materials
, Article Journal of Applied Polymer Science ; Volume 95, Issue 5 , 2005 , Pages 1181-1188 ; 00218995 (ISSN) ; Abbasi, F ; Shojaei, A ; Sharif University of Technology
2005
Abstract
The wear properties of low modulus polymer-based friction materials were studied. The wear equation W = K Pa Vb tc was used to correlate the wear of polymer-based friction material sliding against cast iron with the wear coefficient (K), load (P), speed (V), and time (f). The parameters were determined experimentally by varying only one variable at a time and keeping the other two variables constant. The wear rate of selected polymer-based friction material was compared with cast iron friction material. © 2005 Wiley Periodicals, Inc
On the performance of passivr TMDs in reducing the damage in 2-D concrete structural models
, Article Procedia Engineering ; Volume 14 , 2011 , Pages 1665-1671 ; 18777058 (ISSN) ; Abtahi, P ; Sharif University of Technology
2011
Abstract
Pozzolanic materials, either naturally occurring or artificially made, have long been in practice since the early civilization. In recent years, the utilisation of pozzolanic materials in concrete construction has become increasingly widespread, and this trend is expected to continue in the years ahead because of technological, economical and ecological advantages of the materials. One of the latest additions to the ash family is palm oil fuel ash, a waste material obtained on burning of palm oil husk and palm kernel shell as fuel in palm oil mill boilers, which has been identified as a good pozzolanic material. This paper highlights test results on the performance behavior of palm oil fuel...
A new developed integrated process configuration for production of hydrogen chloride using geothermal and wind energy resources
, Article Sustainable Energy Technologies and Assessments ; Volume 45 , 2021 ; 22131388 (ISSN) ; Ghorbani, B ; Khalili, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Ethylene dichloride thermal cracking is one of the conventional methods for hydrogen chloride production. A critical issue concerned with this method is to provide thermal energy for cracking reaction, which is generally provided by the flammable gasses inside the furnace. Utilizing renewable energy sources can be an interesting topic in this case. Hence, in this paper, the thermal integration feasibility of an ethylene dichloride cracking unit with a hybrid renewable plant, based on geothermal and wind energies, is investigated, while the case study for wind turbines system (Alstom ECO 74/1670/ Class II model) is Meshkin Shahr, located in Iran. To utilize geothermal energy, a...