A. Ould-Dris

University of Technology of Compiègne | UTC · Transformations Intégrées de la Matière Renouvelable (TIMR) - EA 4297

Furfural has become one of the most promising building blocks directly derived from biomass. It can be transformed into numerous important biobased chemicals. Among them, furfuryl ethers such as furfuryl ethyl ether (FEE) and tetrahydrofurfuryl ethyl ether (THFEE) are considered to be attractive derivatives, notably as fuel components, due to their...

This work is concerned with the cyanide removal from aqueous solution by oxidation with hydrogen peroxide H2O2 catalyzed by copper zinc oxide (CuO-ZnO) nanoparticles prepared by co-precipitation method. The influences of catalyst dose, hydrogen peroxide concentration, temperature, and catalyst stability on cyanide removal were examined. The use of...

Cyanide compounds are widely used in some electroplating, chemical, and metallurgical industries. They are often found in their liquid discharges. This work highlights the performance of an activated alumina-supported copper catalyst in the removal of cyanide by oxidation with hydrogen peroxide in aqueous solution. The influence of catalyst dose, i...

Process intensification research is concentrated on the use of the continuous flow microreactor over the conventional batch reactors due to the various advantages that bring this latter in terms of efficient micromixing and enhanced heat and mass transfer in small residence time. The continuous flow process has been successfully developed for many...

This work presents a novel technique with fast response for Residence Time Distribution (RTD) measurements in gas-solid unit operations (e.g., fluidized bed reactors). This technique is based on an optical method which eliminates the requirement of knowing the velocity and concentration profiles at the exit section of the system. Experiments were c...

The most important model catalytic reaction to test the catalytic activity of metal nanoparticles is the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride as it can be precisely monitored by UV–vis spectroscopy with high accuracy. This work presents the catalytic reduction of 4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp) in the pre...

The use of Pd nanoparticles (Pd-NPs) to realize several important organic reaction can permit to achieve efficient catalysis with low metal loading of metal (<1000 ppm), hence providing greener catalytic system. However, to be truly green Pd-NPs need to be synthesized in a sustainable manner and be able to react in aqueous media in order to avoid t...

This work is dedicated to the removal of free cyanide from aqueous solution trough oxidation with hydrogen peroxide H2O2 catalyzed by copper-oxide nanoparticles. Effects of initial molar ratio [H2O2]0/[CN−]0, catalyst dose, temperature, pH and the catalyst stability on cyanide removal have been investigated. The use of copper-oxide has improved the...

Dysfunctions observed in thermochemical conversion reactors, like dead zones and short‐ circuits, generally lead to inaccurate pricing of energy resources and air pollution, and originate in the air flow conditions in these aeraulic reactors.[1–3] Therefore, they can be prevented by better control of flows. In this work, we propose to develop a new...

A shear-enhanced filtration process with ultrafiltration (UF) for the concentration of milk was investigated to recycle nutrients and produce cheese. Full recycling experiments were utilized to study the influence of operation conditions (rotating speed, transmembrane pressure (TMP), and membrane types) on separation performance, flux behavior, ene...

This work presents a comparative study of direct and staged pyrolysis of softwood (500/200) and hardwood (315HD) for the production of bio-oil with the aim to enhance the selective production of high added value molecules. The experiments were conducted in a fixed bed reactor under nitrogen flow rate. The effect of temperature is investigated betwe...

Cyanide is considered one of the most dangerous compounds for the environment. They are discharged by various industries: chemical and metallurgical processes (extraction of gold and silver) and food industries. Adsorption is among the most used processes for elimination of cyanides particularly for the low concentrations. In this work, the cyanide...

The energy conversion in a thermal reactor has a negative impact on the environment, due to the emission of greenhouse gases. It is also related to energy consumption, which is important for weak yields, and creates problems for reacting flows. The present contribution aims to optimize the operation of energy equipment and prevent their dysfunction...

Ilmenite-type natural ore which is constituted mainly of iron-titanium oxide is an interesting candidate as an oxygen carrier in chemical looping combustion (CLC) process. Its reactivity was investigated using methane as reducing gas and air as oxidizing gas. Experiments were carried out in a coupled thermogravimetric–thermo differential analyzer (...

This work is devoted to the removal of free cyanide from aqueous solution by oxidation with hydrogen peroxide H2O2 catalyzed by copper-impregnated activated carbon. Effects of initial molar ratio [H2O2]0/[CN−]0, copper-impregnated activated carbon amount, pH and the temperature on cyanide removal have been investigated.The presence of copper-impreg...

In this study we present a method for investigating the effect of acrolein, a nephrotoxic and urotoxic metabolite of the anticancerous prodrugs ifosfamide and cyclophosphamide, in a blood-renal barrier biochip. The real time monitoring of mass transfers of caffeine, vitamin B12 and albumin in the biochip was performed thanks to an in vitro dialysis...

In this communication we demonstrate a conception of an artificial microkidney using pertinent microtools that more accurately mimic organ functions in vitro. We present a technique to integrate polyethersulfone (PES) membranes usually used in hemodialysis inside a polydimethylsiloxane (PDMS) microchip. The purpose of the microchip is to model glom...

This work is dedicated to the removal of the very toxic free cyanide from aqueous solution by oxidation with hydrogen peroxide H2O2 in the presence of activated carbon prepared from olive stones. Effects of the initial molar ratio [H2O2]0/[CN−]0, the initial cyanide concentration, the activated carbon concentration and the temperature on cyanide re...

Liver assist devices have been developed in the last few decades to support patients with liver failure on the road to either recovery or transplantation. The efficiency of hollow fiber based bioartificial livers depends greatly on the choice of membrane in terms of permeability, cut off and biocompatibility. The aim of this study was thus to inves...

MnCuO(x)/TiO(2) supported catalyst was synthesized by the incipient wetness impregnation method. The catalyst was then tested for the oxidation of chlorobenzene (CB) used as a Cl-VOC model. The results showed that MnCuO(x)/TiO(2) is very active for CB oxidation since a total conversion (exclusively into H(2)O, CO(2) and Cl(2)) was reached at 350 de...

Airlift Reactors may present an alternative to fluidized bed bioreactors with integrated alginate beads in order to immobilize hepatocytes for bioartificial liver use. The present study was aimed to examine the bi-directional mass transfers of the marker Vitamin B12 between the surrounding fluid and the empty alginate beads. A simplified mathematic...

A series of mixed oxides supported on TiO2 (Mn1−yCuyOx/TiO2) synthesized by incipient wetness impregnation method have been characterized and tested for toluene oxidation volatile organic compounds (model). For all catalysts, the total conversion (100%) of toluene into CO2 was obtained at temperatures higher than 240°C with no catalyst deactivation...

The effects of thermo-compression on the physical properties such as bulk density, mass yield, surface area, and also adsorption capacity of activated carbon were studied. The activated carbon samples were prepared from thermo-compressed and virgin fir-wood by two methods, a physical activation with CO2 and a chemical activation with KOH. A prelimi...

Ultrafiltration of pectin and albumin solutions was carried out on two different membranes. For both solutions, tests were performed at different transmembrane pressures, concentrations and velocities. A model combining the serial resistances and concentration polarization models in the steady state and laminar flow regime was proposed and compared...

This article presents the study of the cross‐flow microfiltration of an aqueous calcium carbonate suspension in the presence of dispersant in order to obtain the highly concentrated retentate. In the absence of a dispersant, the cross‐flow microfiltration with cylindrical ceramic membrane permitted to increase the CaCO3 suspension concentration fro...

This paper investigates the effect of cyclic variations of transmembrane pressure (TMP), velocity and concentration on the particle cake formed on an organic membrane during the microfiltration of CaCO3 suspension. The steady-state permeate flux was measured in a series of tests in which the TMP was varied between 0.25 and 3bar, the velocity was ch...

We present a modification of the concentration polarization model with shear-induced diffusion which corrects the problem of flux overestimation at the membrane inlet and takes into account the presence of a particle cake layer of a finite thickness and the effect of particle polydispersity. The resistance of the cake is calculated from the Kozeny–...

This paper investigates the possibility of finding periodic flow regimes consisting of alternate phases of filtration and membrane cleaning leading to large steady state permeate fluxes, at least when the flux decline is mostly due to the deposited cake layer on the membrane surface. This technique was tested on microfiltration of CaCO3 suspensions...

The detailed flow structure and characteristics of moving bed flow in pipes in the presence of an either co- or counter-currently flowing interstitial gas are studied both experimentally and theoretically. Experiments are performed with 0.2 mm diameter sand particles in an L-valve installation operated in the moving bed flow regime both in the vert...

This paper describes the fouling mechanism in cross-flow filtration of a mineral CaCO3 suspension. Since the minimum particle size (1 μm for a mean of 6 μm) was larger than the pore size (0.2 μm) of the ceramic membrane, fouling is in this case exclusively superficial and Brownian diffusion effects are negligible. The transmembrane pressure was inc...

Plug flow of polyethylene pellets was studied in a 50 mm i.d horizontal pipe. The evolution of plug length and velocity along the pipe was deduced from relationships based on mass balances at the front and back of the plug. The average pressure profile along the pipe was analysed with the help of the Ergun equation which governs interstitial gas fl...