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RISS 인기검색어
- 검색키워드
- 저자 : Sorood. Zahedi. Abghari (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Determination of yield distribution in olefin production by thermal cracking of atmospheric gasoil
Sorood. Zahedi. Abghari,Jafar. Towfighi. Darian,Ramin. Karimzadeh,Mohammad Reza Omidkhah 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
A pilot plant was designed and set up to study the thermal cracking of atmospheric gasoil. Based on the CCD (central composite design) method, a set of systematic experiments were designed and carried out. The designed variables were COT (coil outlet temperature), steam ratio and feed flow rate. The ranges of these variables were, respectively, equal to 716-884 oC, 0.46-1.136 and 0.977-6.02 g/min. The obtained minimum and maximum yield of ethylene was, respectively, equal to 1.7% and 30.9%, as well as the maximum yield of propylene was 12.2%. To predict the yield distribution of products and the coke formation in the range of operating conditions, a mechanistic model was developed based on experimental results. To analyze and characterize the atmospheric gasoil, a novel algorithm was applied. This algorithm utilized density, ASTM distillation curve, H/C ratio and the total aromatic fraction and generates the detail analysis of feedstock including paraffinic, naphthenic, aromatics and poly aromatic compounds.
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Sorood Zahedi Abghari,Saeed Shok,Behnam Baloochi,Mehdi Ahmadi Marvast,Shahram Ghanizadeh,Afshin Behroozi 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.1
To investigate the efficiency of a Co-Mo catalyst in HDS process, a set of experiments were designed and carried out based on central composite design (CCD) methodology in an HDS pilot plant. The designed variables included temperature, LHSV and pressure. However, the hydrogen over fresh feed ratio remained constant. The ranges of these variables were, respectively, equal to 335-361℃ , 1.06-1.8 1/hr and 46.8-53.2 bar. The outcomes of experiments were employed to determine the coefficients of statistical models. For the clarification of the accuracy of the model,several statistical tests like ANOVA (Analysis of Variance), Lack-of-Fit test and residual squares were carried out. To optimize the operating conditions to achieve maximum sulfur removal, an optimization algorithm was employed. The outcomes revealed that the minimum sulfur content, which is 23.65 ppm in the final product, is attained at 355℃, 1.2 1/hr and 49.2 bar.
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Reza Hayati,Sorood Zahedi Abghari,Sepehr Sadighi,Mahmood Bayat 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
The isomerization process is a substantial technology to produce clean fuel from linear paraffinic speciesexisting in light naphtha. We investigated the influence of hydrocracking reactions besides the other reactions on theresearch octane number (RON) of the isomerization product. A reaction network and a kinetic model including fifteenlumps and sixteen reactions were developed. Several experiments were carried out in a pilot plant to estimatekinetic parameters. The accuracy of the model was evaluated by comparing the model prediction with the experimentalresults. The maximum RON and process yield were strongly dependent on the temperature, hydrogen to hydrocarbonmolar ratio (H2/Oil) and liquid hourly space velocity (LHSV). Also, increasing the reaction temperature compensatedfor the negative effects of raising the LHSV and H2/Oil in RON maximization. Moreover, we concluded thatthe hydro cracking reactions were very effective on RON, such that they can dominate the role of the other reactions. By sensitivity analysis in this research, a rule was obtained to declare the effect of operating condition on maximizationof RON and the method of revamping of naphtha isomerization reactor.
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Khashayar Yaghoubi,Neda Gilani,Sorood Zahedi Abghari,Farangis Fallah Mehneh,Mohammad Eisazadeh 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
A dynamic model was developed to investigate the impact of operating conditions on the main outputvariables of the fluidized catalytic cracking (FCC) process with a high-efficiency regenerator and to determine the optimalamounts of operating variables, at the Abadan refinery FCC unit in Iran. To determine the rate constants in thedeveloped kinetic model and other related constants in the developed model, a wide range of industrial data were gatheredfrom the targeted process over several months. Through applying an adjusted dynamic model, the effect of gradualincreases in feed preheat temperature (350-500 K) on the yield of gasoline and LCO was investigated, and increasesin both yields were observed. The effects of sudden changes in feed preheat temperature, feed and regenerated catalystflow rate on gasoline yield were also examined. The results showed that a sudden 6.9% increase in feed, a sudden 30Kdecrease in temperature and a sudden 1.12% decrease in catalyst flow rate resulted in 2%, 0.27% and 0.5% decreases ingasoline, respectively. Furthermore, potential methods for neutralizing these negative effects on the gasoline yield wereinvestigated. Finally, the operating conditions were optimized to improve the gasoline and octane number. Three differentoptimization cases were studied. The profitability of the unit increased about $2.5-3.8 million per year. A reductionin energy consumption of 12,500 to 21,000Gj/yr was achieved. The amount of feed and the catalyst flow rate were alsodecreased by 1.5% and 0.2%-0.9%, respectively.
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