Textural comparison of resorcinol-formaldehyde xerogels obtained by vacuum drying and convective drying

Poster (2005, July 10)

Suitability of convective air drying for the production of porous resorcinol-formaldehyde and carbon xerogels

in Carbon (2005), 43(8), 1808-1811

Production of resorcinol formaldehyde xerogels by convective drying

in Proceedings of the joint conference of AFSIA (Association Française pour le Séchage dans l’Industrie et l’Agriculture) and Working group on Drying of EFCE at INA P-G, Paris, 12th and 13th May, 2005 (2005, May)

Moisture profiles determination during convective drying using x-ray microtomography

in Canadian Journal of Chemical Engineering (2005), 83(1), 127-131

The knowledge of internal moisture profiles which develop during drying is essential for model validation purposes, but they are difficult to determine experimentally. This paper shows that X-ray ... [more ▼]

The knowledge of internal moisture profiles which develop during drying is essential for model validation purposes, but they are difficult to determine experimentally. This paper shows that X-ray microtomography, together with image analysis, provides an accurate, non destructive and easy to use technique to determine moisture profiles. Results reported concern the drying of wastewater sludges whose management is becoming a real environmental challenge. An analysis of the development of moisture gradients at the sample external wall shows an influence of drying operating conditions. Finally, mass diffusion coefficients are estimated from the knowledge of both the moisture gradients and the drying flux. [less ▲]

Integrated adsorbent and process characterization. Application to air separation PSA processes

Conference (2005)

High energy, high resolution x-ray tomography applied to catalytic distillation packings

Conference (2005)

3D imaging of reactive distillation packings with a new high energy x-ray tomograph

in Jong, A.; Takei, M.; William, R. A. (Eds.) et al Proceedings of 4th World Congress in Industrial Process Tomography (WCIPT4), Aizu, Japan, 5-8 septembre 2005 (2005)

Possibilities and limits of application of electrical resistance tomography in hydrodynamics of bubble columns

in Canadian Journal of Chemical Engineering (2005), 83(1), 4-10

Knowing the hydrodynamic regime in which is working a bubble column is of great importance because the regime affects strongly the mass transfer between the phases. To this end, we examine the ... [more ▼]

Knowing the hydrodynamic regime in which is working a bubble column is of great importance because the regime affects strongly the mass transfer between the phases. To this end, we examine the potentialities of an Electrical Resistance Tomography (ERT) device. We analyse cross correlation of electrode pair measurements, of neighbouring pixels and power spectra of averaged pixels within a single plane as well as cross correlations of averaged pixels between two planes, without finding a clear signature of the churn turbulent flow. Variable gas flow rate inputs are used to determine the time resolution of the ERT. [less ▲]

Wastewater sludge convective drying: Influence of sludge origin

in Environmental Technology (2004), 25(9), 1051-1057

This paper deals with thermal drying of wastewater sludges, whose management will become crucial in the forthcoming years. Sludges collected after mechanical dewatering in 5 different WWTPs are submitted ... [more ▼]

This paper deals with thermal drying of wastewater sludges, whose management will become crucial in the forthcoming years. Sludges collected after mechanical dewatering in 5 different WWTPs are submitted to the same convective drying treatment in order to try finding some relations between the drying behaviours, the type of effluent and wastewater treatments. Results show clearly sludge drying remains a particularly complex operation because sludges may exhibit very different behaviours, both from kinetic and texture points of view. Initial moisture content and global composition are not sufficient to explain the different observed behaviours. It is too early to claim one or another type of water treatment has an influence on the drying behaviour. However, the drying rates can be classified in the inverse order of the organic content. Moreover for sludges at the same siccities, the harder the material (rheological properties), the higher the drying rate. Final textural properties can be related to the rheological properties and the internal diffusion limitations lowering the drying intensity. [less ▲]

Computed Tomography at the University of Liège – Chemical Engineering Laboratory

Scientific conference (2004, August)