References of "Récents progrès en génie des procédés"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailPhotocatalytic degradation of water pollutants with visible light-sensitized TiO2 xerogels
Tasseroul, Ludivine ULg; Pirard, Sophie ULg; Lambert, Stéphanie ULg et al

in Récents Progrès en Génie des Procédés (2014), 106

To extend its photocatalytic activity to visible light, TiO2 has been doped in situ through the cogelation sol-gel proces with two dyes : free metal tetra(4-carboxyphenyl)porphyrin and nickel tetra(4 ... [more ▼]

To extend its photocatalytic activity to visible light, TiO2 has been doped in situ through the cogelation sol-gel proces with two dyes : free metal tetra(4-carboxyphenyl)porphyrin and nickel tetra(4-carboxyphenyl)porphyrin. DR and FT-IR spectroscopies have been performed to determine the interaction between porphyrins and TiO2. Cristallinity and specific surface area have been measured by XRD and N2 adsorption. The photoactivity of the doped TiO2 xerogels has been evaluated for p-nitrophenol (a model water pollutant) degradation under visible light and a kinetic study has been performed. The samples allow the degradation of 40% of p-nitrophenol in 6 h which makes them very promising for water decontamination under natural light. A kinetic study of p-nitrophenol degradation with the Ni-doped catalyst has shown that the best kinetic model involves one type of active site corresponding to the hole h+ of electron-hole pairs created at the TiO2 surface by light. The rate determining step consists of the surface reaction between adsorbed p-nitrophenol and adsorbed OH• radicals. [less ▲]

Detailed reference viewed: 37 (8 ULg)
Full Text
Peer Reviewed
See detailMesure par tomographie à rayons X de l’influence de la viscosité du liquide sur la morphologie de l’écoulement dans un garnissage structuré
Janzen, Anna; Steube, Julia; Kenig, Evgeny et al

in Récents Progrès en Génie des Procédés (2013), 104

In this work X-ray tomography is used to analyse the influence of liquid viscosity on the local morphology of liquid flow in a column filled with Mellapak Plus 752Y structured packing. Water and glycerine ... [more ▼]

In this work X-ray tomography is used to analyse the influence of liquid viscosity on the local morphology of liquid flow in a column filled with Mellapak Plus 752Y structured packing. Water and glycerine aqueous solutions of various viscosities (1 to 20 cP) are successively used as working liquids. On tomographic images, three different local liquid flow patterns (films, contact-point liquid, flooded regions) may be identified. An image analysis method based on morphological techniques is developed to quantify the fraction of liquid flow within each flow pattern depending on flow rate and liquid viscosity. [less ▲]

Detailed reference viewed: 16 (2 ULg)
Full Text
Peer Reviewed
See detailModélisation du captage post-combustion du CO2 avec évaluation de la dégradation des solvants
Léonard, Grégoire ULg; BELLETANTE, Ségolène; Cabeza Mogador, Bruno et al

in Récents Progrès en Génie des Procédés (2013), 104

Post-combustion CO2 capture in power plants is one of the most mature technologies for a short-term and large-scale decrease of CO2 emissions while simultaneously addressing the growing global energy ... [more ▼]

Post-combustion CO2 capture in power plants is one of the most mature technologies for a short-term and large-scale decrease of CO2 emissions while simultaneously addressing the growing global energy demand. CO2 is chemically absorbed in an amine solvent that can be regenerated at higher temperature, producing a pure CO2 stream. However, the large impact of this technology on the power plant efficiency and the environmental penalty are the main drawbacks for large-scale implementation. In this work, an innovative approach combining process modeling and evaluation of the environmental penalty due to amine degradation is presented. Based on experimental results, the kinetics of solvent oxidative and thermal degradation is estimated and included in the process model developed in Aspen Plus. Using this model, the influence of operating parameters like the oxygen concentration in the flue gas or the solvent regeneration pressure is studied. This model is a first step for a multi-objective optimization of the CO2 capture process, assessing both energy and environmental penalties of this technology. [less ▲]

Detailed reference viewed: 66 (9 ULg)
Full Text
Peer Reviewed
See detailBiofilm formation on metal structured packing for the production of high added value biomolecules
Zune, Quentin ULg; Zune, Quentin ULg; Toye, Dominique ULg et al

in Récents Progrès en Génie des Procédés (2013)

Many white biotechnology bioprocesses apply techniques from chemical engineering based on bioreactors with mechanical stirring system commonly employed in pharmaceutical sector, food industry or energy ... [more ▼]

Many white biotechnology bioprocesses apply techniques from chemical engineering based on bioreactors with mechanical stirring system commonly employed in pharmaceutical sector, food industry or energy field (Dasilva, 2004). As in chemical engineering, scale-up of these bioprocesses induces physicochemical constraints that affect physiological pathways and decrease performances. In this context, it is essential to think new bioprocesses better suited to physiology of microorganisms, minimizing physicochemical constraints. The aim of this work consists to use stainless steel structured packing (SSP) with high specific area (500-750 m²/m³) as inert support for biomass immobilization in order to produce high added value biomolecules. These bioreactors are biocatalysts in which microbial system is immobilized biomass on the form of a biofilm performing bioconversion of a substrate into a specific product (Rosche, 2009). In this study, an experimental setting containing a SSP reproduces solid-state fermentation (SSF) like conditions. Two well known microorganisms for their ability to form biofilm and secrete metabolites are tested in the experimental setting : Bacillus subtilis for its lipopeptides and Aspergillus oryzae for its glucoamylase. Effectiveness of the bioprocess in term of dynamic of the excretion of the target biomolecule is compared with a classical submerged culture (SmF). For lipopeptides production from B. subtilis, SSP is located in a 20L bioreactor continuously aspersed by liquid medium required to the growth of the biofilm. In the case of A. oryzae, the SSP is partially immerged in a 250 mL shake flask. X-ray tomography of the SSP allows non-invasive visualization and quantification of biofilm repartition inside the support. Implementation of SSP permits almost total immobilization of biomass on the form of a mono-species biofilm to the detriment of the liquid phase. Processing of images obtained by X-ray tomography of the SSP provides relevant information for the optimization of the bioprocess. For both microorganism species, results indicate the influence of parameters such as hydrodynamics, aeration rate and microorganism specificity, on the biofilm morphology inside the support and the performances of the bioprocess. SSF-like conditions in the experimental setting lead to technologic progress, such as absence of foam formation, persistence of the microbial system, and improve the dynamic of metabolites excretion compared with conditions imposed by the submerged culture. Further experiment will consider hydrodynamics aspects and amount of carbon source on effectiveness of the bioprocess. [less ▲]

Detailed reference viewed: 81 (28 ULg)
Full Text
Peer Reviewed
See detailInfluence des traitements de steam explosion sur la dégradation thermique des fibres de cellulose
Jacquet, Nicolas ULg; Quievy, Nicolas; Vanderghem, Caroline ULg et al

in Récents Progrès en Génie des Procédés (2011), 101

The aim of this study is to identify the impact of different steam explosion treatments on the thermal degradation of cellulose fibers. The intensities of the treatments were defined by a severity factor ... [more ▼]

The aim of this study is to identify the impact of different steam explosion treatments on the thermal degradation of cellulose fibers. The intensities of the treatments were defined by a severity factor (SF), based on the residence time and the process temperature. The results obtained show that thermal degradation of cellulose fibers is limited when the severity factor value is below 4.0. At higher intensities, determination of thermal degradation products shows a significant increase of the hydroxymethylfurfural (5-HMF) amount when increasing the intensity of the treatment. When the severity factor reached 5.2, TGA analysis shows that the increase of degradation products is coupled to an increase of the char level meaning a strong degradation of the cellulose. [less ▲]

Detailed reference viewed: 57 (25 ULg)
Full Text
Peer Reviewed
See detailEffets de la pression partielle en hydrogène sur la production anaérobie de bioH2 par une bactérie chimiotrophe du genre Clostridium dans un nouveau réacteur à cylindre horizontal rotatif.
Beckers, Laurent ULg; Hiligsmann, Serge ULg; Hamilton, Christopher ULg et al

in Récents Progrès en Génie des Procédés (2011, December), 101

Hydrogen is widely considered as the most promising energetic carrier. At an industrial scale, steam reforming of methane is currently the major hydrogen producing process. But it may also be produced ... [more ▼]

Hydrogen is widely considered as the most promising energetic carrier. At an industrial scale, steam reforming of methane is currently the major hydrogen producing process. But it may also be produced from renewable biomass. Indeed, the fermentative production of hydrogen from renewable biomass using anaerobic bacteria could at least partially reduce our dependence on fossil fuel, decrease the carbon dioxide emissions and produce “green” energy. It offers the potential production of usable hydrogen from a variety of renewable resources such as carbohydrates wastes from agriculture or agro-food industries. This technology is based on anaerobic fermentation, called dark fermentation, by chemotrophic bacteria. The investigations carried out at CWBI involve selection and characterization of bacteria strains able to produce biohydrogen efficiently and with a wide range of substrate. The selected strains at the laboratory has been characterised as Clostridium sp. In order to produce hydrogen at high yields and production rates, the biotechnological process needs to be further optimized and efficient bioreactors must be designed. At CWBI, a new reactor called “horizontal rotating cylinder bioreactor” allows the production of biohydrogen from glucose with our Clostridium sp. strain with a high yield and production rate. This reactor, working continuously, has an internal volume of 2.3l but a working volume (liquid phase) of 300ml. Firstly, it enhances the hydrogen production rate by partially fixing the bacteria on the porous cylinder and thus increasing the cell concentration in the bioreactor. Secondly, the rotative cylinder enables efficient gas transfer (mainly hydrogen) from the liquid phase where it is produced by the bacteria. This is an important way to enhance hydrogen production yield by allowing the bacteria metabolism to shift in a fermentation type that produces more hydrogen. This was confirmed by increasing or decreasing the total pressure in the bioreactor and observing the influence of hydrogen production. The liquid to gas hydrogen transfer is possibly an important factor to enhance the biogas production. Our investigation confirmed this by testing different liquid to gas transfer condition in BHP test (batch fermentation in 250ml serum bottles).This was made either by decreasing total and partial pressure or by increasing the mixing state of the media. Our work concludes the importance of providing good liquid to gas transfers in the biohydrogen producing reactors to enhance the hydrogen production and reach higher yields and production rates. [less ▲]

Detailed reference viewed: 55 (12 ULg)
Full Text
Peer Reviewed
See detailOptimisation du procédé de captage de CO2 dans des solvants aminés
Léonard, Grégoire ULg; Heyen, Georges ULg

in Récents Progrès en Génie des Procédés (2011), 101

Post-combustion carbon capture in amine solvents is currently one of the most promising technologies to prevent large quantities of CO2 from being emitted into the atmosphere. Two models (equilibrium and ... [more ▼]

Post-combustion carbon capture in amine solvents is currently one of the most promising technologies to prevent large quantities of CO2 from being emitted into the atmosphere. Two models (equilibrium and kinetics) have been built using the Aspen Plus software in order to optimise the capture process. A sensitivity study at constant CO2 capture rate has shown that the solvent concentration, its flow rate and its regenerating pressure have the largest influence on the process energy requirement. Different process flowsheet modifications such as the lean vapor compression, an absorber inter-cooling and the split-flow configuration have been simulated as well, decreasing the energy cost of the process. Tests on a pilot installation will be made that will help to validate this model. [less ▲]

Detailed reference viewed: 111 (18 ULg)
Full Text
Peer Reviewed
See detailRegio-selective enzymatic interesterification combined with dry fractionation to produce cocoa butter equivalent.
Danthine, Sabine ULg; Vanden Bossche, sandrine ULg; Maes, Jeroen et al

in Récents Progrès en Génie des Procédés (2011), 101

Detailed reference viewed: 19 (5 ULg)
Full Text
Peer Reviewed
See detailProcédure simple pour estimer les capacités de stockage de chaleur des systèmes solide/gaz : Application au stockage d’énergie solaire dans les bâtiments
Courbon, Emilie; Skrylnyk, Alexandre; Hennaut, Samuel ULg et al

in Récents Progrès en Génie des Procédés (2011), 101

The development of an autonomous solar heating system for individual houses using inter seasonal thermo-chemical storage assuring all the needs of heat and hot water relies on the appropriate choice of ... [more ▼]

The development of an autonomous solar heating system for individual houses using inter seasonal thermo-chemical storage assuring all the needs of heat and hot water relies on the appropriate choice of the sorbent/vapour pair. The selection of the working pair is of primary importance and the selection procedure rarely takes into account all the parameters of the global system (like solar collectors, heat distribution system, thermal needs of the building). We propose a selection procedure in three successive steps, the first one is only based on thermodynamic data (pressure and temperature conditions), the second one includes heat and mass balances on the storage for a one-year period and the third one simulates the global system including the thermal needs of the building. This procedure highlights several promising working pairs which offer thermal energy densities higher than 300 kWh/m³ of reactor, but also allows the optimization of the storage system parameters: for example a 12 m³ reactor filled with CaCl2 coupled to a 14m² surface area solar collector offers an energy density of nearly 200 kWh/m³ of reactor whereas the activated carbon/methanol pair reaches only 60 kWh/m³ of reactor with a 40m³ volume reactor and 13m² surface area solar collector. [less ▲]

Detailed reference viewed: 81 (9 ULg)
Full Text
Peer Reviewed
See detailCaractérisation de particules d'engrais : corrélation entre les propriétés physiques et morphométriques
Miserque, Olivier; Tissot, Serge; Pirard, Eric ULg

in Récents Progrès en Génie des Procédés (2001), 15(78),

Detailed reference viewed: 31 (2 ULg)
Full Text
See detailÉtude de l'influence de l'hydrodynamique sur une bactérie filamenteuse par analyse d'images
Groslambert, Sylvie ULg; Blacher, Silvia ULg; Crine, Michel ULg

in Récents Progrès en Génie des Procédés (2001), 78(18), 153-158

Detailed reference viewed: 8 (3 ULg)
See detailÉtude hydrodynamique d'un fermenteur airlift adapté pour le mode de fonctionnement fed-batch
Groslambert, Sylvie ULg; Schlitz, Marc; Crine, Michel ULg

in Récents Progrès en Génie des Procédés (1991), 5(16), 11-16

Detailed reference viewed: 14 (5 ULg)