Study of a platelet catalytic three-phase reactor filled with a Pt-β-SiC using formic acid oxidation as test reaction

International @ CDFA+TSN:MTF:PFOInternational audienceA platelet catalytic three-phase reactor equipped wit a Pt--SiC foam was characterized first in cold conditions (O2-water) with hydrodynamic of liquid phase and gas-liquid mass transfer. Axial dispersion was significant and dependant of operating conditions like interstitial velocities, foam morphology or flow direction as well as kLa in the range of 0.3 to 0.8.10-3 s-1. A specific protocol has been optimized to deposit Pt on the SiC foam. Intrinsic activity was determined and compare with other catalysts. Finally, platelet catalytic foam reactor was tested in continuous using acid formic oxidation as a model reaction. Reactor optimization has to be continued in order to avoid possible external mass transfer limitations

Methodology for the study of vacuum gas oil hydrocracking catalysts in a batch reactor

International @ RAFFINAGE+MTFInternational audienceNon

Study of a platelet catalytic three-phase reactor filled with a Pt-β-SiC using formic acid oxidation as test reaction

International @ CDFA+TSN:MTF:PFOInternational audienceA platelet catalytic three-phase reactor equipped wit a Pt--SiC foam was characterized first in cold conditions (O2-water) with hydrodynamic of liquid phase and gas-liquid mass transfer. Axial dispersion was significant and dependant of operating conditions like interstitial velocities, foam morphology or flow direction as well as kLa in the range of 0.3 to 0.8.10-3 s-1. A specific protocol has been optimized to deposit Pt on the SiC foam. Intrinsic activity was determined and compare with other catalysts. Finally, platelet catalytic foam reactor was tested in continuous using acid formic oxidation as a model reaction. Reactor optimization has to be continued in order to avoid possible external mass transfer limitations

Consequence of structural identifiability properties on state-model formulation for linear inverse chromatography

International audienc

Modelling and simulation of a catalytic membrane reactor

International audienc

A new technique for the determination of contact time distribution (CTD) from tracers experiments in heterogeneous systems

International audienc

Non-isothermal gas–liquid absorption with chemical reaction studies

International audienc

A transient permeation-based method for composite zeolite membranes characterization

International audienceAn in situ nondestructive characterization method for zeolite composite membranes, based on transient permeation experiments, is proposed in the present article. This technique allows an accurate evaluation of the zeolite selective layer thickness as well as the thermodynamic and transport properties of sorbing hydrocarbons. To this end, a dynamic model representing mass transport phenomena within the whole permeating module is derived. In order to get the crystal layer properties, a two‐step experimental approach is required. The zeolite layer effective thickness is first estimated with the permeation of a nonadsorbing species like hydrogen. Then, the adsorption equilibrium constants and the diffusion coefficients of butane isomers are determined. Three membranes obtained by different synthesis procedures are studied in the Henry domain. The estimated values of the equilibrium constants and diffusion coefficients for normal butane and isobutane are favorably compared with existing literature data. © 2008 American Institute of Chemical Engineers AIChE J, 200

BATCH REACTOR MODELLING: KINETIC INTEGRATING VAPOR-LIQUID EQUILIBRIUM

International @ RAFFINAGE+TSN:MTF:CGEInternational audienceNon

Hydroconversion of an atmospheric residue with a dispersed catalyst in a batch reactor: Kinetic modeling including vapor-liquid equilibrium

International @ RAFFINAGE+TSN:MTF:CGEInternational audienceA kinetic model was proposed to describe the atmospheric residue hydroconversion with a dispersed catalyst in a batch reactor. The model, taking into account the gas-liquid mass transfer, includes hydrogen and five lumps: remaining residue (> 510°C), VGO (350-510°C), distillate (180-350°C), naphtha (40-180°C), and gas. Vapor-liquid equilibrium (VLE) was determined by performing an adiabatic flash with PROII software. Atmospheric residue fractions reacted with active hydrogen species (activated by dispersed MoS2 catalysts in-situ generated from a precursor) to give lighter fractions, such as naphtha and gas oil were produced with almost no coke formation. The experiments of atmospheric residue hydroconversion were performed under the reaction conditions of 420 or 430°C, an initial partial pressure of hydrogen of 15 MPa, and different reaction times. Stoichiometric coefficients, kinetic parameters and the mass transfer coefficient (kLa) were estimated using a nonlinear least-squares regression of the experimental results. The calculated apparent activation energies and the contribution of hydrogen concentration via the Hatta number in liquid phase on hydroconversion were discussed