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ZareNezhad, Bahman 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.1
Reaction of oxalic acid crystals with solution was experimentally investigated in a 1.5L batch reactor at different operating conditions. The reaction was fast and took place very near to the surface of solid reactant. The dissolution process was found to be bulk diffusion controlled. A surface reaction model considering particle shrinkage was proposed for description of the process. Predicted fractional conversion of oxalic acid crystals were in good agreement with experimental values at different operating conditions. Conversion of oxalic acid crystals was significantly affected by the initial mean size of the solid reactant, while the temperature had the smallest effect. The activation energy of the dissolution process was determined as 12.89 kJ mol^-1. The proposed process can be used as an alternative way for boric acid production.
Bahman ZareNezhad,Mona Mottahedin,Farshad Varaminian 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.12
The carbon dioxide gas hydrate formation kinetics at the onset of turbidity is experimentally and theoretically investigated. It is shown that the time-dependent heterogeneous nucleation and growth kinetics are simultaneously governing the hydrate formation process at the onset of turbidity. A new approach is also presented for determination of gas hydrate-liquid interfacial tension. The CO2 hydrate-liquid interfacial tension according to the suggested heterogeneous nucleation mechanism is found to be about 12.7 mJ/m2. The overall average absolute deviation between predicted and measured CO2 molar consumption is about 0.61%, indicating the excellent accuracy of the proposed model for studying the hydrate-based CO2 capture and sequestration processes over wide ranges of pressures and temperatures.
Bahman Zarenezhad,Mona Mottahedin,Ali Haghighi Asl 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3
Accurate prediction of phase equilibria regarding CH_4 replacement in hydrate phase with high pressure CO_2 is an important issue in modern reservoir engineering. In this work we investigate the possibility of establishing a thermodynamic framework for predicting the hydrate equilibrium conditions for evaluation of CO_2 injection scenarios. Different combinations of equations of state and mixing rules are applied and the most accurate thermodynamic models at different CO_2 concentration ranges are proposed.
Bahman Zarenezhad,Ali Aminian 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.5
A multi-layer feed-forward artificial neural network has been presented for accurate prediction of the vapor liquid equilibrium (VLE) of CO_2+alkanol mixtures. Different types of alkanols namely, 1-propaol, 2-propanol, 1-butanol,1-pentanol, 2-pentanol, 1-hexanol and 1-heptanol, are used in this study. The proposed network is trained using the Levenberg-Marquardt back propagation algorithm, and the tan-sigmoid activation function is applied to calculate the output values of the neurons of the hidden layers. According to the network's training, validation and testing results,a six layer neural network is selected as the best architecture. The presented model is very accurate over wide ranges of experimental pressure and temperatures. Comparison of the suggested neural network model with the most important thermodynamic correlations shows that the proposed neuromorphic model outperforms the other available alternatives. The predicted equilibrium pressure and vapor phase CO_2 mole fraction are in good agreement with experimental data suggesting the accuracy of the proposed neural network model for process design.
Bahman ZareNezhad 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.5
carbon dioxide freezing phenomenon is investigated at the cryogenic operating conditions of the turbo-expansion-based NGL plants. The Peng-Robinson equation of state is used for predicting the CO2liquid and vapor mixtures of CO2-CH4. A new quadratic temperature dependent kij corelation is also presented for properdescription of binary interactions at low temperatures. The overall average absolute relative deviation between experi-mental and predicted CO2 freezing temperatures is 0.26% .
Simulation of reactive precipitation processes using the network-of-zones model
Bahman ZareNezhad 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.6
2-D network-of-zones model is extended and applied to a reactive precipitation process in batch mode.The simulations are performed for a network of size 2(1010) for an elementary reaction through the solution of1400 ODEs. The complicated interactions between mixing efficacy and the system kinetics are systematically investi-gated. When the stirrer speed is very slow, the crystal size distribution (CSD) of the product in the precipitator is de-termined by the intensity of mixing. Conversely, at higher stirrer speed, the CSD is controlled by the system kinetics.More effective mixing leads to an increase in the number of crystals, a reduction of the average size and a narrowercrystal size distribution. The extended network-of-zones model presented in this work can be used conveniently forintegrating computational fluid dynamics and reactive precipitation processes.
Bahman ZareNezhad 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
In the processing of sour natural gas, the conversion of hydrogen sulfide into elemental sulfur is often carried out using the modified Claus sulfur recovery process. In this work, the most important influencing parameters regarding the selection of the proper catalysts for Claus SRU (sulfur recovery unit) converters are technically evaluated. It is shown that the pore size and pore size distribution, size, shape, bulk density, mechanical strength and attrition resistance of the catalyst particles are the main parameters which should be considered in selection of Claus catalysts. The general classification of Claus catalysts and the most important specifications required for proper selection of converter catalysts are also presented. 2009 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Application of palladium supported on functionalized MWNTs for oxidative desulfurization of naphtha
Neda Mohammadi Meman,Bahman ZareNezhad,Alimorad Rashidi,Zeinab Hajjar,Elaheh Esmaeili 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this research, Pd supported multi wall carbon nanotube(MWNT) nano catalyst prepared in previouswork used for investigation the efficiency of an oxidative desulfurization (ODS) process in sulfurreduction from naphtha. Palladium (Pd) supported on functionalized multi-walled carbon nanotubes(FMWNTs) have been found to be effective in catalyzing oxidation of the sulfur impurities in naphtha tocorresponding sulfones. a catalyst of 0.1%wt Pd on FMWNT as a support synthesized by impregnationmethod and was characterized by TEM, X-ray Diffraction (XRD), TPR and BET analysis. oxidativedesulfurization reaction was done at 25 8C in atmospheric pressure under reaction condition of VH2O2 =2 mL and Fuel/solvent molar ratio = 2.We also applied our catalyst in oxidative desulfurization reactionof naphtha (with sulfur contents 870 ppm), and more than 90% of sulfur was removed from naphthaunder mild reaction conditions.