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Author

Daniel Tondeur

Other affiliations: Nancy-Université, Elf Aquitaine
Bio: Daniel Tondeur is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Pressure swing adsorption & Adsorption. The author has an hindex of 28, co-authored 104 publications receiving 2510 citations. Previous affiliations of Daniel Tondeur include Nancy-Université & Elf Aquitaine.


Papers
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Patent
04 Feb 1986
TL;DR: In this paper, a column with plates in which plates (4, 5, 6) in the form of semicircles are disposed alternately on both sides of a continuous vertical wall dividing the column into two sectors which are leaktight to the passage of gases and vapours and staggered axially, each plate having at one of its edges a liquid reception area (4a, 5a, 6a) and at the other end a sectional pane forming an outlet (4d,5d, 6d), the said reception areas and the said outlets being situated altern
Abstract: 1. Distillation column with plates in which plates (4, 5, 6) in the form of semicircles are disposed alternately on both sides of a continuous vertical wall (2) dividing the column into two sectors which are leaktight to the passage of gases and vapours and staggered axially, each plate having at one of its edges a liquid reception area (4a, 5a, 6a) and at the other end a sectional pane forming an outlet (4d,5d, 6d), the said reception areas and the said outlets being situated alternately in the sequence of superimposed plates sometimes on one and sometimes on the other side of the plate, characterized in that each sector of the column is subdivided by at least one wall (11) into at least two sub-sectors of substantially equal surface, the said wall having above each plate a cut-out section (4e, 5e, 6e) leaving between the edge of the cut-out section and the plate a passage for the liquid crossing the plate from one sub-sector to another, so that each sub-sector is traversed by a gaseous current which does not mix with other gaseous currents, whilst the gaseous currents each one of which circulates along a single sub-sector encounter flowing in the opposite direction, the same total liquid current running in a helicoidal movement from one plate to the other.

3 citations

Journal ArticleDOI
TL;DR: In this paper, a staged contacting device adapted from Craig's countercurrent extractor has been designed to allow back and forth stepwise displacement of the light liquid phase while the heavy liquid phase remains stationary.
Abstract: A staged contacting device adapted from Craig's countercurrent extractor has been designed to allow back and forth stepwise displacement of the light liquid phase while the heavy liquid phase remains stationary. Thermal parametric pumping experiments were run in this staged apparatus, at total reflux, with water as the heavy, stationary phase, toluene as the light moving phase, and phenol as the solute distributed linearly between the two phases. The transient and steady regimes of this operation are investigated by introducing a matrix formalism and studying the properties of eigenvalues and eigenvectors. It is shown how this formalism can be extended to more complex situations involving nonideal separations and transfer of phases, several transfers per half-cycle, and partial reflux.

2 citations

Journal ArticleDOI
01 Aug 2015
TL;DR: In this article, the authors expose the aspects generaux de l'analyse entropique comme outil d'optimisation thermodynamique, en mettant en exergue l'interet of l'equipartition, c'est-a-dire the repartition homogene de la production d'entropie.
Abstract: En [BE 8 017], on a expose les aspects generaux de l'analyse entropique comme outil d'optimisation thermodynamique, en mettant en exergue l'interet de l'equipartition, c'est-a-dire la repartition homogene de la production d'entropie. Le present dossier [BE 8 018] est consacre a l'extension et a l'illustration de cette analyse a l'aide de differents exemples. Dans de nombreux systemes, il existe plusieurs mecanismes differents de production d'entropie. Par exemple dans un echangeur thermique y contribuent a la fois la dissipation visqueuse (observee comme une perte de pression) et le transfert thermique. La minimisation sous contrainte de la production totale d'entropie dans ce cas conduit a une certaine repartition de la contribution (locale et/ou globale) de ces mecanismes, qui n'est pas en general l'equipartition, mais une relation plus generale qui depend des exposants affectant les variables de controle des lois de transfert L'equipartition apparait comme un cas particulier dans cette problematique (§ 1). Un systeme peut par ailleurs echanger de la matiere et de l'energie avec plusieurs sources et puits. Il peut alors exister une allocation optimale des tâches entre ces sources et puits. Sur un exemple de transferts thermiques, et en nous appuyant sur la notion de procedes endoreversibles, nous montrerons que la encore, la minimisation des irreversibilites pour une tâche globale fixee correspond a l'equipartition des irreversibilites entre sources (§ 2). L'echangeur de chaleur tubulaire coaxial servira egalement de support pour illustrer plus quantitativement les calculs de production d'entropie et de performances au voisinage d'un fonctionnement satisfaisant l'equipartition (§ 3). La repartition des irreversibilites dans l'espace concerne autant un espace « continu », comme la coordonnee le long de l'echangeur tubulaire, qu'un espace discretise, constitue par une sequence de composants ou d'equipements, par exemple les differents etages d'un compresseur. On illustrera la pertinence de l'equipartition par plusieurs exemples de ce type. Dans cette analyse, on retrouvera une notion familiere en genie thermique et en genie chimique: la notion de « contre-courant ». En effet, la configuration a contre-courant apparaitra comme une facon commode de se rapprocher de (sinon d'atteindre) l'equi-partition dans des echanges entre deux courants materiels (§ 4). Cette approche thermodynamique ne fait pas intervenir directement de couts monetaires ou de notions d'amortissement et ne saurait donc etre confondue avec une optimisation technico-economique. Sur un exemple, nous montrerons cependant qu'un probleme d'allocation optimale de ressources, au sens financier, peut conduire parfois a repartir uniformement une grandeur qui combine des parametres financiers et la production d'entropie, et qui se reduit a cette derniere dans une limite thermodynamique (§ 4.5).

2 citations

Journal ArticleDOI
TL;DR: In this paper, a systematic thermodynamic approach is proposed that allows a rigorous formulation of the governing equations in non-isothermal situations, by introducing the surface effects in the energy and entropy balances.
Abstract: This contribution focuses on some non-classical aspects of capillary phenomena, mostly omitted in classical approaches, in particular the non-isothermal aspects. A systematic thermodynamic approach is proposed that allows a rigorous formulation of the governing equations in non-isothermal situations, by introducing the surface effects in the energy and entropy balances. The energetic quantities (work and heat) are calculated in a number of examples, such as adiabatic and isothermal wetting/dewetting of a porous medium, nanofluids heating, emulsion split, and new equilibrium criteria are derived were appropriate.

2 citations

Patent
06 Nov 1998
TL;DR: In this article, the authors proposed a parallel-pipedal ad-sorbant assembly consisting of a stack of heat-conducting sheets separated by layers of adsorbant.
Abstract: An adsorbant assembly comprises a stack of heat-conducting sheets separated by layers of adsorbant. Also claimed is a parallelpipedal module comprising such a stack, designed for flow of gas to be treated (100) in one direction between the sheets and with thermoelectric elements (11) for heating and cooling the stack in contact with the sheet edges extending in said direction. Also claimed is use of an array of such modules in series or parallel, the temperatures of respective modules being varied by elements (11) in a regular cycle whereby enriched and depleted gas steams are alternately obtained at the outlet of the array.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the pore size distributions derived from adsorption isotherms of micro- and mesoporous materials are identified and discussed based on new results and examples reported in the recent literature.

1,775 citations

Journal ArticleDOI
TL;DR: Entropy generation minimization (finite time thermodynamics, or thermodynamic optimization) is the method that combines into simple models the most basic concepts of heat transfer, fluid mechanics, and thermodynamics as mentioned in this paper.
Abstract: Entropy generation minimization (finite time thermodynamics, or thermodynamic optimization) is the method that combines into simple models the most basic concepts of heat transfer, fluid mechanics, and thermodynamics. These simple models are used in the optimization of real (irreversible) devices and processes, subject to finite‐size and finite‐time constraints. The review traces the development and adoption of the method in several sectors of mainstream thermal engineering and science: cryogenics, heat transfer, education, storage systems, solar power plants, nuclear and fossil power plants, and refrigerators. Emphasis is placed on the fundamental and technological importance of the optimization method and its results, the pedagogical merits of the method, and the chronological development of the field.

1,516 citations

Book
Ralph T. Yang1
01 May 2003
TL;DR: Sorbent Selection: Equilibrium Isotherms, Diffusion, Cyclic Processes, and Sorbent Selection Criteria as mentioned in this paper is one of the most commonly used metrics in adorbent design.
Abstract: Preface. 1. Introductory Remarks. 2. Fundamental Factors for Designing Adsorbent. 3. Sorbent Selection: Equilibrium Isotherms, Diffusion, Cyclic Processes, and Sorbent Selection Criteria. 4. Pore Size Distribution. 5. Activated Carbon. 6. Silica Gel, MCM, and Activated Alumina. 7. Zeolites and Molecular Sieves. 8. &pi -Complexation Sorbents and Applications. 9. Carbon Nanotubes, Pillared Clays, and Polymeric Resins. 10. Sorbents for Applications. Author Index. Subject Index.

1,303 citations

Book
01 Jan 1994
TL;DR: In this paper, a pressure swing adsorption cycle comprised of blowdown, purge, pressurization, feed, pressure equalization and rinse steps provided recovery from an atmospheric air feed, essentially dry and free of carbon dioxide, of a high yield of high purity nitrogen gas and a product gas rich in oxygen.
Abstract: A pressure swing adsorption cycle comprised of blowdown, purge, pressurization, feed, pressure equalization and rinse steps provided recovery from an atmospheric air feed, essentially dry and free of carbon dioxide, of a high yield of high purity nitrogen gas and a high yield of a product gas rich in oxygen as well as recovery of a residual feed byproduct gas for recycle with the air feed.

943 citations

Journal ArticleDOI
19 Nov 2015-Nature
TL;DR: Flexible compounds Fe(bdp) and Co(BDp) (bdp2− = 1,4-benzenedipyrazolate) are shown to undergo a structural phase transition in response to specific CH4 pressures, resulting in adsorption and desorption isotherms that feature a sharp ‘step’.
Abstract: Two flexible metal-organic frameworks are presented as solid adsorbents for methane that undergo reversible phase transitions at specific methane pressures, enabling greater storage capacities of usable methane than have been achieved previously, while also providing internal heat management of the system. Natural gas — methane — is a clean and cheap fuel but its usefulness in transport applications is limited by storage problems, given its low energy density per unit volume under ambient conditions compared with petrol or diesel. One way of increasing methane storage capacity is to use tanks containing porous materials, such as metal–organic frameworks, as a storage medium. However, for every methane molecule adsorbed and desorbed there is an associated thermal fluctuation that could cause overheating or reduce storage efficiency if left unchecked. Here Jeffrey Long and colleagues describe two flexible metal–organic frameworks that undergo reversible phase transitions at specific methane pressures, enabling greater storage capacities of usable methane than have been achieved previously, while also providing internal heat management of the system. As a cleaner, cheaper, and more globally evenly distributed fuel, natural gas has considerable environmental, economic, and political advantages over petroleum as a source of energy for the transportation sector1,2. Despite these benefits, its low volumetric energy density at ambient temperature and pressure presents substantial challenges, particularly for light-duty vehicles with little space available for on-board fuel storage3. Adsorbed natural gas systems have the potential to store high densities of methane (CH4, the principal component of natural gas) within a porous material at ambient temperature and moderate pressures4. Although activated carbons, zeolites, and metal–organic frameworks have been investigated extensively for CH4 storage5,6,7,8, there are practical challenges involved in designing systems with high capacities and in managing the thermal fluctuations associated with adsorbing and desorbing gas from the adsorbent. Here, we use a reversible phase transition in a metal–organic framework to maximize the deliverable capacity of CH4 while also providing internal heat management during adsorption and desorption. In particular, the flexible compounds Fe(bdp) and Co(bdp) (bdp2− = 1,4-benzenedipyrazolate) are shown to undergo a structural phase transition in response to specific CH4 pressures, resulting in adsorption and desorption isotherms that feature a sharp ‘step’. Such behaviour enables greater storage capacities than have been achieved for classical adsorbents9, while also reducing the amount of heat released during adsorption and the impact of cooling during desorption. The pressure and energy associated with the phase transition can be tuned either chemically or by application of mechanical pressure.

737 citations