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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.
Comparison of CFD results and experimental data in a fixed bed Fischer–Tropsch synthesis reactor
Ali Reza Miroliaei,Hossein Atashi,Ramin Karimzadeh,Farhad Shahraki 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
Hydrogenation of carbon monoxide in a fixed bed Fischer–Tropsch reactor has been simulated using computational fluid dynamics. The geometry of fixed bed reactor was modeled using the discrete packing method. The effects of reaction temperature, feed flow rate and H2/CO ratio on CO conversion and product selectivity were investigated. The mass fraction of products was also predicted by using the CFD model at different H2/CO ratios. It was observed that the CO conversion increased with increasing temperature,while decreased with increasing mass flow rate. The selectivity and mass fraction of products also increased with increasing temperature and H2/CO ratio.
Structural modeling of petroleum fractions based on mixture viscosity and Watson K factor
Mohammad Reza Omidkhah,Abbas Mohammadi,Ramin Karimzadeh,Ali Haghtalab 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Two procedures have been developed for structural modeling of petroleum fractions based on mixture viscosity and Watson K factor. The representative molecules of paraffinic, naphthenic and aromatic hydrocarbons, based upon Ruzicka’s structural model, have been determined for lube-oil cut SAE 10 from Tehran oil refinery. Unlike previous methods, the newly developed procedures do not require time-consuming and costly laboratory data such as true boiling point profile. Good agreement between predictions of the new models and experimental results has been observed. Moreover, the proposed methods take less run-time than previous models due to less experimental and computational complexities. The results indicate that Ruzicka’s procedure, based on vapor pressure, is only applicable for light hydrocarbon mixtures, while the new methods can be applied for structural modeling of a wide range of petroleum fractions. Furthermore, as a result of this study, the application of a vapor pressure constraint leads to a higher degree of accuracy than the earlier suggested constraint, partial pressure, by Ruzicka.