Boudjema Hamada | University Of Boumerdes Algeria (original) (raw)

Papers by Boudjema Hamada

At Gassi Touil Plant problem in Algeria used absorption dehydration involves the use of diethylen... more At Gassi Touil Plant problem in Algeria used absorption dehydration involves the use of diethylene glycol to remove water from the natural gas. But this absorption process produced many problems and perturbations to the treatment gas process such as glycol losses, foaming and corrosion. Thus a dehydration process by adsorption was proposed to solve the operation problems of the absorption process. In this work the design of adsorption columns is proposed.

During the last decade many and considerable advances are being realized in the field of detectio... more During the last decade many and considerable advances are being realized in the field of detection and measurement using surface acoustic wave (SAW) and quartz crystal microbalances (QCM) based sensors. Thus, the current work attempts to investigate the contribution of polymers based polysiloxane mixed with zeolite in sensitive layers used in the above cited sensors types for detection of organic and organophosphorus toxics. The inverse gas chromatography technique (IGC) which is proven as versatile method for the polymer's surface exploration was used to understand phenomenon governing the adsorption occurred on the mixed polymer zeolite. The polyphenylmethylsiloxane/HZSM-5 was used as stationary phase to determine the specific retention volumes and the interaction parameters, on two ranges of temperature (200-230°C and 270-300°C). The obtained results with the organophosphorus solutes reveal the existent of strong affinity of retention, which let us to suggest that the prepared blend can be used as sensitive layers for the detection of toxics.

La reaction de l'isomerisation du m-xylene sur la zeolithe synthetise de type NaX et dont la ... more La reaction de l'isomerisation du m-xylene sur la zeolithe synthetise de type NaX et dont la forme sodique a ete change en utilisant l'ammoniaque afin d'acceder a sa forme protonique (acide) qui est la forme active pour catalyser cette reaction. On obtient un melange de xylenes (meta-, orto- et para-xylene) ainsi que quelques produits secondaires issues des reactions de transalkylation (toluene, trimethylbenzenes,...). une etude cinetique ainsi qu'une optimisation du rendement en ortho- et para-xylene ont ete realise.

Algerian Journal of Environmental Science and Technology, 2021

The desulfurization of light cycle oil containing 2157 ppmw sulfur has been studied using acetoni... more The desulfurization of light cycle oil containing 2157 ppmw sulfur has been studied using acetonitrile, N-methylpyrrolidone, and N,N-dimethylformamide as extraction solvents. The performance of these polar solvents has been carefully evaluated and compared under different experimental conditions by considering both desulfurization and raffinate recovery. It has been observed that an increase in the solvent/feed ratio from 1.0 to 2.5 decreased the sulfur content and the yield of the refined products. In addition, increasing the number of extraction stages from 1 to 3 had the same effect on the desulfurization process. The results obtained indicated that the degree of sulfur removal using Nmethylpyrrolidone and N,N-dimethylformamide is much higher than with acetonitrile. However, the yield values for N-methylpyrrolidone and N,N-dimethylformamide solvents are lower than acetonitrile. The three-stage extraction experiments carried out at 50°C with a solvent/feed ratio equal to 2.5 produ...

arXiv: Mesoscale and Nanoscale Physics, 2019

Raza et al. recently observed the extraordinarily large energy blueshifts of localized surface pl... more Raza et al. recently observed the extraordinarily large energy blueshifts of localized surface plasmon resonances and additional surface plasmon resonances of silver nanoparticles encapsulated in silicon nitride, which are not fully understood yet. There exists a quantum model for metallic nanospheres, which consists of two subsystems respectively for describing center of mass and intrinsic motions of conduction electrons, and a coupling between center of mass and conduction electrons outside the nanosphere. By using this model, we firstly deduced the general energy and linewidth size-dependences of localized surface plasmon resonances. Secondly, we proposed that additional surface plasmon resonances originate from degenerate state pairs of the total Hamiltonian. Then, we implemented this generation mechanism of additional surface plasmon resonances in silver nanoparticles encapsulated in silicon nitride and the calculated results are well consistent with experimental measurements. ...

A detailed study of retention of the variety of volatile organic solvents (VOS) and organophospho... more A detailed study of retention of the variety of volatile organic solvents (VOS) and organophosphorus compounds on the polydimethylsiloxane (PDMS) preliminary characterized by FTIR and DSC methods was carried out by means of an inverse gas chromatography technique. The specific retention volumes and infinite dilution activity coefficients were determined for different classes of VOCs, linear and cyclic alkanes, chloroalkanes, oxygen compounds (alcohols, ketones, and esters), and nitriles as well as for typical organophosphorus compounds, 4-nitrophenyl esters of diethyl phosphoric (paraoxon) and diethyl thiophosphoric (parathion) acids. The effect of dipole-dipole interactions and dispersion interactions on the efficacy of the retention of the studied compounds on the PDMS was analyzed. Organophosphorus stimulants are characterized by strong retention on the PDMS, the difference in their retention are to be connected with more efficient dipole-dipole interaction of the oxygen atom of paraoxon with the PDMS than that of the sulphur atom of parathion. A possibility of using PDMS as a base for the detection layers sensitive to organophosphorus compounds was demonstra

Materials Today: Proceedings, 2021

Journal of Engineering Research, 2021

The current research paper focuses on the physico-chemical optimization’s parameters for the Micr... more The current research paper focuses on the physico-chemical optimization’s parameters for the Microwave Assisted Extractive/ Oxidative Desulfurization (MAEOD) of a real Algerian diesel. The oxidative desulfurization was carried out using vanadyl acetyl acetonate as catalyst, hydrogen pyroxide (30%) as oxidant and an acid Bronsted Ionic Liquid (IL) in situ synthesized as extractor. The utilized optimization method is consistent with the full factorial experiment. The engaged parameters are the masse ratio (catalyst/oil), the volume ratio (IL/oil), and the reaction time. Quantification of total sulfur in samples was realized by X-ray fluorescence and a regression model is formed. The most important model parameters’ interaction effects are examined and the ISO-response curves are outlined in order to simulate the optimal conditions. The optimum yield (81.77%) was achieved during a time radiation of 70 s with a catalyst/oil ratio of 0.4% and IL/oil volume ratio of 11%, with correlation ...

Fullerenes, Nanotubes and Carbon Nanostructures, 2021

Particularly large surface area and well-defined nanoparticles are both critical in the issue of ... more Particularly large surface area and well-defined nanoparticles are both critical in the issue of nonporous carbons for challenging energy, catalyst and environmental fields. Therefore, following th...

Journal of Molecular Liquids, 2021

Abstract Imidazolium-based ionic liquids (ILs), as one of the most popular and investigated class... more Abstract Imidazolium-based ionic liquids (ILs), as one of the most popular and investigated classes of ILs owing to their outstanding physicochemical features, find applications in different fields over the last decades. Their thermal stability is of paramount importance for their effective use at elevated temperatures. 1,3-dibutyl-imidazolium bromide ([BBIm][Br] is an interesting IL, which may be employed for different purposes. Nevertheless, its thermal stability and decomposition kinetic are scarce. In the present work, 1,3-dibutyl-imidazolium bromide ([BBIm][Br]) is successfully synthesized through a simple, clean, and efficient solvent-free and one-pot ultrasonic method. Its structure was assessed by DSC, FTIR, Raman spectroscopies, µXRF, one-dimensional (1-D) liquid state 1H, 13C, and 15N NMR. The 2-D NMR analyses thoroughly discussed herein corroborated the structure of the cation as well as the alkyl side chains. Its thermal stability and decomposition kinetic were performed with non-isothermal thermogravimetry analysis at different heating rates. The kinetic triplet was determined using isoconversional kinetic methods. It is revealed that [BBIm][Br] undergoes a single step mass loss in the temperature range of 180–380 °C for which the activation energy is 140 kJ/mol. Furthermore, it is proved that the decomposition mechanism that best represents the experimental data is the nth order (Fn) reaction mechanism.

International Journal of Environmental Analytical Chemistry, 2020

An analytical reagent ether crown DB-18-C-6 was extensively used for the simultaneous and individ... more An analytical reagent ether crown DB-18-C-6 was extensively used for the simultaneous and individual extraction and spectrophotometric determination of the tungsten and cobalt at microgram levels. The ligand reacts with two metals, and the ion-association systems were extractable into chloroform giving a yellowish [(DB-18-C-6•NH 4) + 2 [WO(SCN) 5 ] 2 ] and [(DB-18-C-6•NH4) + 2 [Co(SCN)4] 2-] complexes. The absorption peaks of these complexes were found overlapping at λmax of 415 nm and 621.6 nm, respectively. Under optimum conditions, the [WO(SCN) 4 ] 2-] complexation and extraction are possible only in concentrated medium (2.5 M of HCl). While, the [Co(SCN)4] 2-] was extractable at a pH range of 4-10. The linear ranges were 29.45-147.25 μg mL −1 for Co(II) and 1.8-183 µg/mL for W(VI) with molar absorptivity, ε = 1.7 × 10 4 and ε = 1.6 × 10 4 dm 3 mol −1 cm −1 , respectively. The accuracy and reproducibility of the proposed method for various amounts of cobalt and tungsten in their binary mixture were tested, and the effects of diverse ions on their extraction were also investigated. The developed method was successfully applied for the simultaneous determination of Co(II) and W(VI) in high-speed steel (HS2-9-1-8) containing 2% W, 9% Mo, 1% V, and 8% Co.

Arabian Journal for Science and Engineering, 2019

The paraffin particles can promote and be involved in the formation of deposits which can lead to... more The paraffin particles can promote and be involved in the formation of deposits which can lead to plugging of oil production facilities. In this work, an experimental prediction of wax appearance temperature (WAT) has been performed on 59 Algerian crude oil samples using a pour point tester. In addition, a modeling investigation was done to create reliable WAT paradigms. To do so, gene expression programming and multilayers perceptron optimized with Levenberg-Marquardt algorithm (MLP-LMA) and Bayesian regularization algorithm were implemented. To generate these models, some parameters, namely density, viscosity, pour point, freezing point and wax content in crude oils, have been used as input parameters. The results reveal that the developed models provide satisfactory results. Furthermore, the comparison between these models in terms of accuracy indicates that MLP-LMA has the best performances with an overall average absolute relative error of 0.23% and a correlation coefficient of 0.9475.

Energy & Fuels, 2019

The deposition of wax is one of the most potential problems that disturbs the flow assurance duri... more The deposition of wax is one of the most potential problems that disturbs the flow assurance during production processes of hydrocarbon fluids. In this study, wax disappearance temperature (WDT) which is recognized as a vital parameter in such circumstances is modeled using advanced machine learning techniques, namely Radial Basis Function Neural Network (RBFNN) coupled with Genetic Algorithm (GA) and Artificial Bee Colony (ABC). Besides, accurate and user-friendly correlation was established by implementing Group Method of Data Handling (GMDH). Results revealed the high reliability of the proposed hybrid models and the established correlation. Moreover, RBFNN coupled with ABC (RBFNN-ABC) was found to be the best paradigm with an overall average absolute relative error (AARD) value of 0.5402% and a total coefficient of determination (R 2) of 0.9706. Furthermore, the performances comparison showed that RBFNN-ABC and the established explicit correlation outperform the prior intelligent and thermodynamic models. Finally, by performing the outliers detection the quality of the utilized database was assessed and the applicability realm of the best model was delineated and only one point was found as doubtful. Keywords-Wax; wax disappearance temperature; radial basis function neural network; artificial bee colony; group method of data handling.

Journal of Pesticide Science, 2018

Methyl parathion (MP) decontamination by hydrolysis in aqueous solutions containing 2-aminoethano... more Methyl parathion (MP) decontamination by hydrolysis in aqueous solutions containing 2-aminoethanol (EA) was investigated using the UV-Visible and GC/MS techniques. The kinetics of the hydrolysis reaction was studied at pH values of 4, 7, and 9 in water at 75, 85, and 95°C, respectively. At various EA concentrations 60, 100, and 200 mg/L MP degradation followed pseudofirst order kinetics and was found to be strongly pH and temperature dependent. The rate of MP degradation accelerated significantly as pH increased. The conversion reached 93.5% after 90 min of hydrolysis at a pH of 9, as compared to 69.9% and 49.8% at pH values of 7 and 4, respectively. The MP degradation byproducts removed from aqueous solutions by solid phase microextraction (SPME) were identified. The main intermediate products were p-nitrophenol and O,O-dimethyl phosphorothioate. This study concludes that hydrolysis in the presence of EA is an effective process for decontaminating solutions containing MP.

Inorganic and Nano-Metal Chemistry, 2019

The mixed oxides of SiO 2-TiO 2 , MoO 3-SiO 2-TiO 2 , CoO-SiO 2-TiO 2 and MoO 3-CoO-SiO 2-TiO 2 a... more The mixed oxides of SiO 2-TiO 2 , MoO 3-SiO 2-TiO 2 , CoO-SiO 2-TiO 2 and MoO 3-CoO-SiO 2-TiO 2 are prepared from a stable homogeneous mixture based on transition metals. During the preparation, it is necessary to know the duration of the stability of this solution, to control its stability, use the Zetasizer. The sol-gel process is one of the most widely used synthetic methods. This leads to the formation of homogeneous products. In present study; the structure, composition, particle size, morphology and porosity of the particles are obtained. The nanostructured mixed oxides has been characterized by physico-chemical analysis methods, including Acidity, Zeta potential, FTIR, BET, X-ray diffraction and TEM.

Petroleum Science and Technology, 2019

In an attempt to develop alternative process that meet the prescribed levels and green-technology... more In an attempt to develop alternative process that meet the prescribed levels and green-technology criteria in gas-oil refining, N,N-methylpyrrolidone (NMP), dimethylformamide (DMF) mixed solvents under microwaveradiations (MW) were tested for the gas-oil desulfurization (EDS), denitrification (EDN) and dearomatization (EDA). In optimal conditions the gas-oil EDS-efficiency via MW can reach as high as 99.1% within 5 min at 500 W in three stages, which is much higher than EDS without MW (88.5% within 15 min) or than those of ionic liquids. The NMP/DMF/EG can be reused for multi-cycles before being regenerated by adsorption method. This study will provide useful information for future industrial application.

Petroleum Science and Technology, 2019

A series of vanadium catalysts were synthesized and employed in pyridinium phosphate [HPy][H 2 PO... more A series of vanadium catalysts were synthesized and employed in pyridinium phosphate [HPy][H 2 PO 4 ] with various oxidants for extractive catalytic oxidesulfurization (ECODS) of diesel. The VO(acac) 2 showed high catalytic activity with HNO 3 /H 2 SO 4 and ionic liquid via microwave radiations in the MECODS of diesel. The sulfur removal could reach 98.9% in 210 s at 500 W, which was superior to that of the simple ECODS (89.3%) under optimal conditions (V diesel ¼ 20 mL, VIL/Vdiesel volume ratio ¼ 0.075, m(VO(acaca) 2)/ m diesel ¼ 0.5 wt%, V(HNO 3)/V(H 2 SO 4) ¼ 1 and T ¼ 80 C). The catalytic system could be regenerated six times without significant loss of activity.

At Gassi Touil Plant problem in Algeria used absorption dehydration involves the use of diethylen... more At Gassi Touil Plant problem in Algeria used absorption dehydration involves the use of diethylene glycol to remove water from the natural gas. But this absorption process produced many problems and perturbations to the treatment gas process such as glycol losses, foaming and corrosion. Thus a dehydration process by adsorption was proposed to solve the operation problems of the absorption process. In this work the design of adsorption columns is proposed.

During the last decade many and considerable advances are being realized in the field of detectio... more During the last decade many and considerable advances are being realized in the field of detection and measurement using surface acoustic wave (SAW) and quartz crystal microbalances (QCM) based sensors. Thus, the current work attempts to investigate the contribution of polymers based polysiloxane mixed with zeolite in sensitive layers used in the above cited sensors types for detection of organic and organophosphorus toxics. The inverse gas chromatography technique (IGC) which is proven as versatile method for the polymer's surface exploration was used to understand phenomenon governing the adsorption occurred on the mixed polymer zeolite. The polyphenylmethylsiloxane/HZSM-5 was used as stationary phase to determine the specific retention volumes and the interaction parameters, on two ranges of temperature (200-230°C and 270-300°C). The obtained results with the organophosphorus solutes reveal the existent of strong affinity of retention, which let us to suggest that the prepared blend can be used as sensitive layers for the detection of toxics.

La reaction de l'isomerisation du m-xylene sur la zeolithe synthetise de type NaX et dont la ... more La reaction de l'isomerisation du m-xylene sur la zeolithe synthetise de type NaX et dont la forme sodique a ete change en utilisant l'ammoniaque afin d'acceder a sa forme protonique (acide) qui est la forme active pour catalyser cette reaction. On obtient un melange de xylenes (meta-, orto- et para-xylene) ainsi que quelques produits secondaires issues des reactions de transalkylation (toluene, trimethylbenzenes,...). une etude cinetique ainsi qu'une optimisation du rendement en ortho- et para-xylene ont ete realise.

Algerian Journal of Environmental Science and Technology, 2021

The desulfurization of light cycle oil containing 2157 ppmw sulfur has been studied using acetoni... more The desulfurization of light cycle oil containing 2157 ppmw sulfur has been studied using acetonitrile, N-methylpyrrolidone, and N,N-dimethylformamide as extraction solvents. The performance of these polar solvents has been carefully evaluated and compared under different experimental conditions by considering both desulfurization and raffinate recovery. It has been observed that an increase in the solvent/feed ratio from 1.0 to 2.5 decreased the sulfur content and the yield of the refined products. In addition, increasing the number of extraction stages from 1 to 3 had the same effect on the desulfurization process. The results obtained indicated that the degree of sulfur removal using Nmethylpyrrolidone and N,N-dimethylformamide is much higher than with acetonitrile. However, the yield values for N-methylpyrrolidone and N,N-dimethylformamide solvents are lower than acetonitrile. The three-stage extraction experiments carried out at 50°C with a solvent/feed ratio equal to 2.5 produ...

arXiv: Mesoscale and Nanoscale Physics, 2019

Raza et al. recently observed the extraordinarily large energy blueshifts of localized surface pl... more Raza et al. recently observed the extraordinarily large energy blueshifts of localized surface plasmon resonances and additional surface plasmon resonances of silver nanoparticles encapsulated in silicon nitride, which are not fully understood yet. There exists a quantum model for metallic nanospheres, which consists of two subsystems respectively for describing center of mass and intrinsic motions of conduction electrons, and a coupling between center of mass and conduction electrons outside the nanosphere. By using this model, we firstly deduced the general energy and linewidth size-dependences of localized surface plasmon resonances. Secondly, we proposed that additional surface plasmon resonances originate from degenerate state pairs of the total Hamiltonian. Then, we implemented this generation mechanism of additional surface plasmon resonances in silver nanoparticles encapsulated in silicon nitride and the calculated results are well consistent with experimental measurements. ...

A detailed study of retention of the variety of volatile organic solvents (VOS) and organophospho... more A detailed study of retention of the variety of volatile organic solvents (VOS) and organophosphorus compounds on the polydimethylsiloxane (PDMS) preliminary characterized by FTIR and DSC methods was carried out by means of an inverse gas chromatography technique. The specific retention volumes and infinite dilution activity coefficients were determined for different classes of VOCs, linear and cyclic alkanes, chloroalkanes, oxygen compounds (alcohols, ketones, and esters), and nitriles as well as for typical organophosphorus compounds, 4-nitrophenyl esters of diethyl phosphoric (paraoxon) and diethyl thiophosphoric (parathion) acids. The effect of dipole-dipole interactions and dispersion interactions on the efficacy of the retention of the studied compounds on the PDMS was analyzed. Organophosphorus stimulants are characterized by strong retention on the PDMS, the difference in their retention are to be connected with more efficient dipole-dipole interaction of the oxygen atom of paraoxon with the PDMS than that of the sulphur atom of parathion. A possibility of using PDMS as a base for the detection layers sensitive to organophosphorus compounds was demonstra

Materials Today: Proceedings, 2021

Journal of Engineering Research, 2021

The current research paper focuses on the physico-chemical optimization’s parameters for the Micr... more The current research paper focuses on the physico-chemical optimization’s parameters for the Microwave Assisted Extractive/ Oxidative Desulfurization (MAEOD) of a real Algerian diesel. The oxidative desulfurization was carried out using vanadyl acetyl acetonate as catalyst, hydrogen pyroxide (30%) as oxidant and an acid Bronsted Ionic Liquid (IL) in situ synthesized as extractor. The utilized optimization method is consistent with the full factorial experiment. The engaged parameters are the masse ratio (catalyst/oil), the volume ratio (IL/oil), and the reaction time. Quantification of total sulfur in samples was realized by X-ray fluorescence and a regression model is formed. The most important model parameters’ interaction effects are examined and the ISO-response curves are outlined in order to simulate the optimal conditions. The optimum yield (81.77%) was achieved during a time radiation of 70 s with a catalyst/oil ratio of 0.4% and IL/oil volume ratio of 11%, with correlation ...

Fullerenes, Nanotubes and Carbon Nanostructures, 2021

Particularly large surface area and well-defined nanoparticles are both critical in the issue of ... more Particularly large surface area and well-defined nanoparticles are both critical in the issue of nonporous carbons for challenging energy, catalyst and environmental fields. Therefore, following th...

Journal of Molecular Liquids, 2021

Abstract Imidazolium-based ionic liquids (ILs), as one of the most popular and investigated class... more Abstract Imidazolium-based ionic liquids (ILs), as one of the most popular and investigated classes of ILs owing to their outstanding physicochemical features, find applications in different fields over the last decades. Their thermal stability is of paramount importance for their effective use at elevated temperatures. 1,3-dibutyl-imidazolium bromide ([BBIm][Br] is an interesting IL, which may be employed for different purposes. Nevertheless, its thermal stability and decomposition kinetic are scarce. In the present work, 1,3-dibutyl-imidazolium bromide ([BBIm][Br]) is successfully synthesized through a simple, clean, and efficient solvent-free and one-pot ultrasonic method. Its structure was assessed by DSC, FTIR, Raman spectroscopies, µXRF, one-dimensional (1-D) liquid state 1H, 13C, and 15N NMR. The 2-D NMR analyses thoroughly discussed herein corroborated the structure of the cation as well as the alkyl side chains. Its thermal stability and decomposition kinetic were performed with non-isothermal thermogravimetry analysis at different heating rates. The kinetic triplet was determined using isoconversional kinetic methods. It is revealed that [BBIm][Br] undergoes a single step mass loss in the temperature range of 180–380 °C for which the activation energy is 140 kJ/mol. Furthermore, it is proved that the decomposition mechanism that best represents the experimental data is the nth order (Fn) reaction mechanism.

International Journal of Environmental Analytical Chemistry, 2020

An analytical reagent ether crown DB-18-C-6 was extensively used for the simultaneous and individ... more An analytical reagent ether crown DB-18-C-6 was extensively used for the simultaneous and individual extraction and spectrophotometric determination of the tungsten and cobalt at microgram levels. The ligand reacts with two metals, and the ion-association systems were extractable into chloroform giving a yellowish [(DB-18-C-6•NH 4) + 2 [WO(SCN) 5 ] 2 ] and [(DB-18-C-6•NH4) + 2 [Co(SCN)4] 2-] complexes. The absorption peaks of these complexes were found overlapping at λmax of 415 nm and 621.6 nm, respectively. Under optimum conditions, the [WO(SCN) 4 ] 2-] complexation and extraction are possible only in concentrated medium (2.5 M of HCl). While, the [Co(SCN)4] 2-] was extractable at a pH range of 4-10. The linear ranges were 29.45-147.25 μg mL −1 for Co(II) and 1.8-183 µg/mL for W(VI) with molar absorptivity, ε = 1.7 × 10 4 and ε = 1.6 × 10 4 dm 3 mol −1 cm −1 , respectively. The accuracy and reproducibility of the proposed method for various amounts of cobalt and tungsten in their binary mixture were tested, and the effects of diverse ions on their extraction were also investigated. The developed method was successfully applied for the simultaneous determination of Co(II) and W(VI) in high-speed steel (HS2-9-1-8) containing 2% W, 9% Mo, 1% V, and 8% Co.

Arabian Journal for Science and Engineering, 2019

The paraffin particles can promote and be involved in the formation of deposits which can lead to... more The paraffin particles can promote and be involved in the formation of deposits which can lead to plugging of oil production facilities. In this work, an experimental prediction of wax appearance temperature (WAT) has been performed on 59 Algerian crude oil samples using a pour point tester. In addition, a modeling investigation was done to create reliable WAT paradigms. To do so, gene expression programming and multilayers perceptron optimized with Levenberg-Marquardt algorithm (MLP-LMA) and Bayesian regularization algorithm were implemented. To generate these models, some parameters, namely density, viscosity, pour point, freezing point and wax content in crude oils, have been used as input parameters. The results reveal that the developed models provide satisfactory results. Furthermore, the comparison between these models in terms of accuracy indicates that MLP-LMA has the best performances with an overall average absolute relative error of 0.23% and a correlation coefficient of 0.9475.

Energy & Fuels, 2019

The deposition of wax is one of the most potential problems that disturbs the flow assurance duri... more The deposition of wax is one of the most potential problems that disturbs the flow assurance during production processes of hydrocarbon fluids. In this study, wax disappearance temperature (WDT) which is recognized as a vital parameter in such circumstances is modeled using advanced machine learning techniques, namely Radial Basis Function Neural Network (RBFNN) coupled with Genetic Algorithm (GA) and Artificial Bee Colony (ABC). Besides, accurate and user-friendly correlation was established by implementing Group Method of Data Handling (GMDH). Results revealed the high reliability of the proposed hybrid models and the established correlation. Moreover, RBFNN coupled with ABC (RBFNN-ABC) was found to be the best paradigm with an overall average absolute relative error (AARD) value of 0.5402% and a total coefficient of determination (R 2) of 0.9706. Furthermore, the performances comparison showed that RBFNN-ABC and the established explicit correlation outperform the prior intelligent and thermodynamic models. Finally, by performing the outliers detection the quality of the utilized database was assessed and the applicability realm of the best model was delineated and only one point was found as doubtful. Keywords-Wax; wax disappearance temperature; radial basis function neural network; artificial bee colony; group method of data handling.

Journal of Pesticide Science, 2018

Methyl parathion (MP) decontamination by hydrolysis in aqueous solutions containing 2-aminoethano... more Methyl parathion (MP) decontamination by hydrolysis in aqueous solutions containing 2-aminoethanol (EA) was investigated using the UV-Visible and GC/MS techniques. The kinetics of the hydrolysis reaction was studied at pH values of 4, 7, and 9 in water at 75, 85, and 95°C, respectively. At various EA concentrations 60, 100, and 200 mg/L MP degradation followed pseudofirst order kinetics and was found to be strongly pH and temperature dependent. The rate of MP degradation accelerated significantly as pH increased. The conversion reached 93.5% after 90 min of hydrolysis at a pH of 9, as compared to 69.9% and 49.8% at pH values of 7 and 4, respectively. The MP degradation byproducts removed from aqueous solutions by solid phase microextraction (SPME) were identified. The main intermediate products were p-nitrophenol and O,O-dimethyl phosphorothioate. This study concludes that hydrolysis in the presence of EA is an effective process for decontaminating solutions containing MP.

Inorganic and Nano-Metal Chemistry, 2019

The mixed oxides of SiO 2-TiO 2 , MoO 3-SiO 2-TiO 2 , CoO-SiO 2-TiO 2 and MoO 3-CoO-SiO 2-TiO 2 a... more The mixed oxides of SiO 2-TiO 2 , MoO 3-SiO 2-TiO 2 , CoO-SiO 2-TiO 2 and MoO 3-CoO-SiO 2-TiO 2 are prepared from a stable homogeneous mixture based on transition metals. During the preparation, it is necessary to know the duration of the stability of this solution, to control its stability, use the Zetasizer. The sol-gel process is one of the most widely used synthetic methods. This leads to the formation of homogeneous products. In present study; the structure, composition, particle size, morphology and porosity of the particles are obtained. The nanostructured mixed oxides has been characterized by physico-chemical analysis methods, including Acidity, Zeta potential, FTIR, BET, X-ray diffraction and TEM.

Petroleum Science and Technology, 2019

In an attempt to develop alternative process that meet the prescribed levels and green-technology... more In an attempt to develop alternative process that meet the prescribed levels and green-technology criteria in gas-oil refining, N,N-methylpyrrolidone (NMP), dimethylformamide (DMF) mixed solvents under microwaveradiations (MW) were tested for the gas-oil desulfurization (EDS), denitrification (EDN) and dearomatization (EDA). In optimal conditions the gas-oil EDS-efficiency via MW can reach as high as 99.1% within 5 min at 500 W in three stages, which is much higher than EDS without MW (88.5% within 15 min) or than those of ionic liquids. The NMP/DMF/EG can be reused for multi-cycles before being regenerated by adsorption method. This study will provide useful information for future industrial application.

Petroleum Science and Technology, 2019

A series of vanadium catalysts were synthesized and employed in pyridinium phosphate [HPy][H 2 PO... more A series of vanadium catalysts were synthesized and employed in pyridinium phosphate [HPy][H 2 PO 4 ] with various oxidants for extractive catalytic oxidesulfurization (ECODS) of diesel. The VO(acac) 2 showed high catalytic activity with HNO 3 /H 2 SO 4 and ionic liquid via microwave radiations in the MECODS of diesel. The sulfur removal could reach 98.9% in 210 s at 500 W, which was superior to that of the simple ECODS (89.3%) under optimal conditions (V diesel ¼ 20 mL, VIL/Vdiesel volume ratio ¼ 0.075, m(VO(acaca) 2)/ m diesel ¼ 0.5 wt%, V(HNO 3)/V(H 2 SO 4) ¼ 1 and T ¼ 80 C). The catalytic system could be regenerated six times without significant loss of activity.