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RISS 인기검색어
- 검색키워드
- 저자 : Reza Mosayebi Behbahani (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Mohammad Ghavipour,Reza Mosayebi Behbahani 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Dimethyl ether (DME) synthesis reaction rate was studied over a commercial sample of γ-Alumina to investigate the accuracy of the most applicable rate models. Due to the deviation of the former proposed models especially at temperatures below 593 K, a new simple empirical rate model was proposed. Besides, previous proposed correlations for methanol dehydration equilibrium constant were examined experimentally and a new equation was developed. Subsequently, one dimensional unsteady state heterogeneous model was applied to simulate adiabatic and non-adiabatic fixed-bed reactors. Temperature profile and methanol conversion along the reactors were predicted while varying feed rate and feed temperature.
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Abolfazl Jomekian,Reza Mosayebi Behbahani,Toraj Mohammadi,Ali Kargari 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
Modified ultra-porous ZIF-8 particles were used to prepare novel ZIF-8/Pebax 1657 mixed matrix membranes (MMMs) on PES support for separation of CO2 from CH4 using spin coating method. TEM and SEM were used to characterize modified ZIF-8 particles. SEM was also used to investigate the morphology of synthesized MMMs. The MMMs with thinner selective layer showed higher CO2 permeability and lower CO2/CH4 selectivity in permeation tests compared to MMMs with thicker selective layer. The plasticization was recognized as the main reason for rise in CO2 permeability and drop in CO2/CH4 selectivity of thinner MMMs. The gas sorption results showed that the high permeability of CO2 in MMMs is mainly due to the high solubility of this gas in MMMs, leading to high CO2/ CH4 solubility selectivity for MMMs. The fractional free volume and void volume fraction of MMMs increased as the thickness of membrane decreased. Applying higher mixed feed pressures and permeation tests temperatures resulted in increase in CO2 permeability and decrease in CO2/CH4 selectivity. At highest testing temperature (60 oC), the CO2 permeability of synthesized MMMs with thinner selective layer remarkably increased.
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Abdolhamid Salahi,Toraj Mohammadi,Reza Mosayebi Behbahani,Mahmood Hemmati 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6
Hollow fiber membranes were prepared from polyethersulfone/additives/NMP&DMSO system via phase inversion induced by precipitation in non-solvent coagulation bath. The interaction effects of polyethylene-glycol (PEG), propionic-acid (PA), Tween-20, PEG molecular weight and polyvinyl-pyrrolidone (PVP) on morphology and performance of synthesized membranes were investigated. Taguchi method (L16 orthogonal array) was used initially to plan a minimum number of experiments. 32 membranes were synthesized (with two replications) and their permeation flux and TOC rejection properties to oily wastewater treatment were studied. The obtained results indicated that addition of PA to spinning dope decreases flux while it increases TOC rejection of prepared membranes. Also, the result shows that addition of PVP, Tween-20 and PEG content in spinning dope enhances permeation flux while reducing TOC rejection. The obtained results indicated that the synthesized membranes was effective and suitable for treatment of the oily wastewater to achieve up to 92.6, 98.2, and 98.5% removal of TOC, TSS, and OGC, respectively with a flux of 247.19 L/(m2h). Moreover, Hermia’s models were used for permeation flux decline prediction. Experimental data and models predictions were compared. The results showed that there is reasonable agreement between experimental data and the cake layer model followed by the intermediate blocking model.
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Experimental and modeling study of CO2 separation by modified Pebax 1657 TFC membranes
Abolfazl Jomekian,Bahamin Bazooyar,Reza Mosayebi Behbahani 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.11
Ionic liquid modified Pebax 1657 thin-film composite (TFC) membranes were synthesized on different porous supports for improved separation of CO2 from CH4 and N2. XRD, SEM, FTIR, TGA, DFT, and BJH tests were utilized for the characterization of TFC membranes and supports. The incorporation of 1,3-Di-n-butyl-2-methylimidazolium chloride ionic liquid into the Pebax 1657 solution led to better compatibility between selective layer and support. The results of gas permeation tests showed an enhanced CO2/CH4 and CO2/N2 selectivity for most of the ionic liquid modified TFC membranes. To derive a predictive model for the permeability of gases in TFC membranes, correction factors () for fractional free volumes of TFC membranes were linearly correlated against correction factors () for porosity and tortuosity of the substrate in the dusty gas model using CO2 experimental permeance data at 20, 60, 100 and 140 oC. The resulting modified model showed remarkable effectiveness in the prediction of permeability of CH4 and N2 in the TFC membrane at investigated temperatures. The comparison of model predictive performance with previous models showed the supremacy of the new model in terms of average absolute relative errors (AARE) and the standard deviation of relative errors ().
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