Documents disponibles écrits par cet auteur

Catalytic wet peroxide oxidation of phenol in a new two-impinging-jets reactor / Asghar Molaei Dehkordi in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10619–10626 Titre : Catalytic wet peroxide oxidation of phenol in a new two-impinging-jets reactor Type de document : texte imprimé Auteurs : Asghar Molaei Dehkordi, Auteur ; Amir Ali Ebrahimi, Auteur Année de publication : 2010 Article en page(s) : pp. 10619–10626 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalytic--Peroxide--Oxidation--Phenol--Impinging-Jets--Reactor Résumé : The catalytic wet peroxide oxidation (CWPO) of phenol with activated carbon (AC) as the catalyst has been successfully tested in a novel type of two-impinging-jets reactor (TIJR). The TIJR is characterized by a high-intensity reaction chamber, which is separated by a perforated plate from other parts of the reactor. The perforated plate was used as a filter to keep the catalyst particles within the reaction chamber. The influences of various operating and design parameters such as jet Reynolds number, feed flow rate, internozzle distance, and the jet diameter on the performance capability of the TIJR were investigated. As a result of the impinging process, turbulence, complex trajectory of AC particles, relatively high local concentration of hydrogen peroxide, and the relatively high local catalyst loading within the reaction chamber, the fractional disappearance of phenol and the total organic carbon (TOC) removal, obtained in the TIJR, increased compared to those obtained by conventional reaction systems such as packed-bed reactors and batch stirred-tank reactors. This may be attributed to the elimination of the external mass-transfer resistance around the solid particles, complex flow pattern within the reaction chamber, energy released as the result of impinging-jets collision, efficient use of hydrogen peroxide caused by the contact pattern provided by the TIJR, and the high-intensity mixing especially at the impingement zone of the TIJR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004496 [article] Catalytic wet peroxide oxidation of phenol in a new two-impinging-jets reactor [texte imprimé] / Asghar Molaei Dehkordi, Auteur ; Amir Ali Ebrahimi, Auteur . - 2010 . - pp. 10619–10626. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10619–10626 Mots-clés : Catalytic--Peroxide--Oxidation--Phenol--Impinging-Jets--Reactor Résumé : The catalytic wet peroxide oxidation (CWPO) of phenol with activated carbon (AC) as the catalyst has been successfully tested in a novel type of two-impinging-jets reactor (TIJR). The TIJR is characterized by a high-intensity reaction chamber, which is separated by a perforated plate from other parts of the reactor. The perforated plate was used as a filter to keep the catalyst particles within the reaction chamber. The influences of various operating and design parameters such as jet Reynolds number, feed flow rate, internozzle distance, and the jet diameter on the performance capability of the TIJR were investigated. As a result of the impinging process, turbulence, complex trajectory of AC particles, relatively high local concentration of hydrogen peroxide, and the relatively high local catalyst loading within the reaction chamber, the fractional disappearance of phenol and the total organic carbon (TOC) removal, obtained in the TIJR, increased compared to those obtained by conventional reaction systems such as packed-bed reactors and batch stirred-tank reactors. This may be attributed to the elimination of the external mass-transfer resistance around the solid particles, complex flow pattern within the reaction chamber, energy released as the result of impinging-jets collision, efficient use of hydrogen peroxide caused by the contact pattern provided by the TIJR, and the high-intensity mixing especially at the impingement zone of the TIJR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9004496

Determination of interfacial area and overall volumetric mass-transfer oefficient in a novel type of two impinging streams reactor by chemical method / Asghar Molaei Dehkordi in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6426-6435 Titre : Determination of interfacial area and overall volumetric mass-transfer oefficient in a novel type of two impinging streams reactor by chemical method Type de document : texte imprimé Auteurs : Asghar Molaei Dehkordi, Auteur ; Chiya Savari, Auteur Année de publication : 2011 Article en page(s) : pp. 6426-6435 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Impinging  stream  Chemical  method  Reactor  Mass  transfer  Volumetric  mass  transfer  coefficient  Interfacial  area Résumé : The theory of mass transfer accompanied by chemical reaction for gas-liquid systems was used to measure the effective interfacial area (a) and the overall volumetric mass-transfer coefficient (kLa) in a new two impinging streams reactor (TISR), which is characterized by ahigh-intensity mixing chamber equipped with two two-phase nozzles directed toward each other. As a result of both the impinging process and high rate shear forces exerted on the gas and liquid phases, the overall volumetric mass-transfer coefficients of up to 0.41 s-1, and the mass-transfer coefficients (kL) of up to 15 × 10-4 m/s have been obtained. In addition, the influences of gas and liquid flow rates on the kLa and a values obtained in the TISR have been investigated. These experimental results verify the capability of the proposed TISR in gas-liquid operations. Furthermore, on the basis of the experimental results obtained, two correlations for both the Sherwood number for the liquid phase (ShL) and the specific interfacial area (a) in terms of Froude, Reynolds, Schmidt, and Morton numbers have been derived. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158940 [article] Determination of interfacial area and overall volumetric mass-transfer oefficient in a novel type of two impinging streams reactor by chemical method [texte imprimé] / Asghar Molaei Dehkordi, Auteur ; Chiya Savari, Auteur . - 2011 . - pp. 6426-6435. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6426-6435 Mots-clés : Impinging  stream  Chemical  method  Reactor  Mass  transfer  Volumetric  mass  transfer  coefficient  Interfacial  area Résumé : The theory of mass transfer accompanied by chemical reaction for gas-liquid systems was used to measure the effective interfacial area (a) and the overall volumetric mass-transfer coefficient (kLa) in a new two impinging streams reactor (TISR), which is characterized by ahigh-intensity mixing chamber equipped with two two-phase nozzles directed toward each other. As a result of both the impinging process and high rate shear forces exerted on the gas and liquid phases, the overall volumetric mass-transfer coefficients of up to 0.41 s-1, and the mass-transfer coefficients (kL) of up to 15 × 10-4 m/s have been obtained. In addition, the influences of gas and liquid flow rates on the kLa and a values obtained in the TISR have been investigated. These experimental results verify the capability of the proposed TISR in gas-liquid operations. Furthermore, on the basis of the experimental results obtained, two correlations for both the Sherwood number for the liquid phase (ShL) and the specific interfacial area (a) in terms of Froude, Reynolds, Schmidt, and Morton numbers have been derived. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158940

Kinetics of glucose isomerization to fructose by immobilized glucose isomerase (sweetzyme IT) / Asghar Molaei Dehkordi in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3271–3278 Titre : Kinetics of glucose isomerization to fructose by immobilized glucose isomerase (sweetzyme IT) Type de document : texte imprimé Auteurs : Asghar Molaei Dehkordi, Auteur ; Mehrdad Shoai Tehrany, Auteur ; Iman Safari, Auteur Année de publication : 2009 Article en page(s) : pp. 3271–3278 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Immobilized  glucose  isomerase  Stirred-tank  reactor  Fructose  isomerization  reaction  Arrhenius-like  expressions Résumé : We present the kinetic parameters and equilibrium constant of the enzymatic glucose−fructose isomerization reaction with an immobilized glucose isomerase (IGI), Sweetzyme IT, using a batch stirred-tank reactor following the procedure developed by Dehkordi et al. ( AIChE J. 2008, 54, 1333). The model predictions were compared with the experimental data and fair agreements were found. The influence of temperature on the equilibrium constant and kinetic parameters of glucose to fructose isomerization reaction was investigated. In addition, the frequency factors and the activation energies were determined by using Arrhenius-like expressions. Furthermore, correlations were found for the maximum reaction rate (i.e., Vm) and apparent Michaelis−Menten constant (i.e., Km). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800400b [article] Kinetics of glucose isomerization to fructose by immobilized glucose isomerase (sweetzyme IT) [texte imprimé] / Asghar Molaei Dehkordi, Auteur ; Mehrdad Shoai Tehrany, Auteur ; Iman Safari, Auteur . - 2009 . - pp. 3271–3278. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3271–3278 Mots-clés : Immobilized  glucose  isomerase  Stirred-tank  reactor  Fructose  isomerization  reaction  Arrhenius-like  expressions Résumé : We present the kinetic parameters and equilibrium constant of the enzymatic glucose−fructose isomerization reaction with an immobilized glucose isomerase (IGI), Sweetzyme IT, using a batch stirred-tank reactor following the procedure developed by Dehkordi et al. ( AIChE J. 2008, 54, 1333). The model predictions were compared with the experimental data and fair agreements were found. The influence of temperature on the equilibrium constant and kinetic parameters of glucose to fructose isomerization reaction was investigated. In addition, the frequency factors and the activation energies were determined by using Arrhenius-like expressions. Furthermore, correlations were found for the maximum reaction rate (i.e., Vm) and apparent Michaelis−Menten constant (i.e., Km). En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800400b

Mixed-convection flow of nanofluids and regular fluids in vertical porous media with viscous heating / Mohammad Memari in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9403-9414 Titre : Mixed-convection flow of nanofluids and regular fluids in vertical porous media with viscous heating Type de document : texte imprimé Auteurs : Mohammad Memari, Auteur ; Ayub Golmakani, Auteur ; Asghar Molaei Dehkordi, Auteur Année de publication : 2011 Article en page(s) : pp. 9403-9414 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heating  Porous  medium  Convection  flow Résumé : In this article, the problem of combined forced and natural convection in a vertical porous channel for both regular fluids and nanofluids has been solved by perturbation and numerical methods, taking into account the influences of viscous heating and inertial force. In this regard, various types of viscous dissipation models, including the Darcy model, the power of drag force model, and the clear fluid compatible model, were considered to account for viscous heating. In addition, the mass flux of nanoparticles was also considered in terms of Brownian and thermophoresis mechanisms. The velocity and temperature distributions of both the regular fluid and nanofluid and the Nusselt number values were determined by considering isothermal boundary conditions in terms of Grashof, Reynolds, Forchheimer, Brinkman, and Darcy numbers. Moreover, the results of the numerical method were validated against those predicted by the perturbation method for small values of the Forchheimer drag term and the Brinkman number. In addition, the results obtained for both the nanofluid and the regular fluid were compared in terms of dimensionless parameters such as Brinkman number, Forchheimer drag term, pressure drop, Grashof-to-Reynolds-number ratio, Darcy number, and nanoparticle mass flux. The predicted results clearly indicate that the presence of nanoparticles enhances the Nusselt number values significantly. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395885 [article] Mixed-convection flow of nanofluids and regular fluids in vertical porous media with viscous heating [texte imprimé] / Mohammad Memari, Auteur ; Ayub Golmakani, Auteur ; Asghar Molaei Dehkordi, Auteur . - 2011 . - pp. 9403-9414. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9403-9414 Mots-clés : Heating  Porous  medium  Convection  flow Résumé : In this article, the problem of combined forced and natural convection in a vertical porous channel for both regular fluids and nanofluids has been solved by perturbation and numerical methods, taking into account the influences of viscous heating and inertial force. In this regard, various types of viscous dissipation models, including the Darcy model, the power of drag force model, and the clear fluid compatible model, were considered to account for viscous heating. In addition, the mass flux of nanoparticles was also considered in terms of Brownian and thermophoresis mechanisms. The velocity and temperature distributions of both the regular fluid and nanofluid and the Nusselt number values were determined by considering isothermal boundary conditions in terms of Grashof, Reynolds, Forchheimer, Brinkman, and Darcy numbers. Moreover, the results of the numerical method were validated against those predicted by the perturbation method for small values of the Forchheimer drag term and the Brinkman number. In addition, the results obtained for both the nanofluid and the regular fluid were compared in terms of dimensionless parameters such as Brinkman number, Forchheimer drag term, pressure drop, Grashof-to-Reynolds-number ratio, Darcy number, and nanoparticle mass flux. The predicted results clearly indicate that the presence of nanoparticles enhances the Nusselt number values significantly. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395885

Novel type of four - impinging - jets reactor for oxidative desulfurization of light fuel oils / Mohammad Amin Sobati in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9339–9348 Titre : Novel type of four - impinging - jets reactor for oxidative desulfurization of light fuel oils Type de document : texte imprimé Auteurs : Mohammad Amin Sobati, Auteur ; Asghar Molaei Dehkordi, Auteur ; Mohammad Shahrokhi, Auteur Année de publication : 2010 Article en page(s) : pp. 9339–9348 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxidative  Desulfurization Résumé : A novel type of four-impinging-jets reactor (FIJR) has been proposed and tested successfully for the oxidative desulfurization of kerosene as a typical light fuel oil. The FIJR is characterized by a high-intensity mixing chamber located at the bottom of the reactor and equipped with four impinging jets. The influences of various operating and design parameters such as feed flow rate, internozzle distance, jet diameter, and jet Reynolds number on the performance of the FIJR have been carefully investigated. As a result of both the impinging process and shear forces exerted on the phases, the rate of desulfurization in FIJR increased significantly compared to that obtained by a conventional reactor system such as stirred-tank reactor (STR). This can be attributed to a decrease in the mass-transfer resistance, complex flow pattern within the reaction chamber, energy released as the result of impinging-jets collision, and high intensity mixing at the impingement zone of FIJR. Moreover, about 92% sulfur removal of kerosene has been obtained in FIJR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101065q [article] Novel type of four - impinging - jets reactor for oxidative desulfurization of light fuel oils [texte imprimé] / Mohammad Amin Sobati, Auteur ; Asghar Molaei Dehkordi, Auteur ; Mohammad Shahrokhi, Auteur . - 2010 . - pp. 9339–9348. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9339–9348 Mots-clés : Oxidative  Desulfurization Résumé : A novel type of four-impinging-jets reactor (FIJR) has been proposed and tested successfully for the oxidative desulfurization of kerosene as a typical light fuel oil. The FIJR is characterized by a high-intensity mixing chamber located at the bottom of the reactor and equipped with four impinging jets. The influences of various operating and design parameters such as feed flow rate, internozzle distance, jet diameter, and jet Reynolds number on the performance of the FIJR have been carefully investigated. As a result of both the impinging process and shear forces exerted on the phases, the rate of desulfurization in FIJR increased significantly compared to that obtained by a conventional reactor system such as stirred-tank reactor (STR). This can be attributed to a decrease in the mass-transfer resistance, complex flow pattern within the reaction chamber, energy released as the result of impinging-jets collision, and high intensity mixing at the impingement zone of FIJR. Moreover, about 92% sulfur removal of kerosene has been obtained in FIJR. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101065q

Solid-liquid catalytic reactions in a new two-impinging-jets reactor / Asghar Molaei Dehkordi in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Permalink

Synthesis of barium sulfate nanoparticles using a spinning disk reactor / Asghar Molaei Dehkordi in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Permalink