publication . Doctoral thesis . 2016

Nouveau procédé de précipitation pour la synthèse d’alumine

Lafficher, Robin;
Open Access French
  • Published: 01 Dec 2016
  • Publisher: HAL CCSD
Abstract
Control of catalyst supports porosity is an important challenge for the refining industry. The aim of this thesis is to develop a new precipitation process in order to obtain γ-alumina supports exhibiting new textural properties compared with those prepared by the conventional boehmite precipitation route in stirred tank reactor. For that purpose, combined influences of precursor, mixing technology and micromixing time on the final product physical properties were studied.Three mixing technologies were compared: a classic stirred tank reactor, a sliding surface mixing device and a rotor-stator mixer. Micromixing time ranges achievable with each of these reactors...
Subjects
free text keywords: Boehmite, Precipitation, Mélangeur rapide, Alumina, Dawsonite, Micromélange, Sursaturation, Alumine, Micromixing, [CHIM.GENI]Chemical Sciences/Chemical engineering, Supersaturation, Fast contacting mixers
111 references, page 1 of 8

III.5.1.2 Bilan de matière dans les agrégats basiques ................................................................. 141

III.5.2 RESULTATS ET DISCUSSION.................................................................................................. 143

III.5.2.1 Influence de la solubilité sur la fréquence de nucléation .............................................. 143

III.5.2.2 Modélisation de l'évolution de la sursaturation avec le temps de micromélange ......... 144

III.5.2.3 Modélisation de l'influence de la viscosité .................................................................. 147

III.5.3 LIMITES DU MODELE ............................................................................................................ 148

III.5.4 BILAN................................................................................................................................... 149

III.6 CONCLUSIONS ...................................................................................................................... 149

CONTINU ........................................................................................................................193

CONCLUSION GENERALE ET PERSPECTIVES ..................................................235 [78] Turnbull, D. & Fisher, J. C. "Rate of Nucleation in Condensed Systems". The Journal of Chemical

Physics 17, 71-73 (1949). [79] Becker, R. & Döring, W. "Kinetische Behandlung der Keimbildung in übersättigten Dämpfen".

Annalen der Physik 416, 719-752 (1935). [80] Zeldovich, Y. B. Selected Works of Yakov Borisovich Zeldovich. (Princeton University Press,

1992). [81] Smoluchowski, M. "Versuch einer mathematischen theorie der koagulationskinetik kolloider

Lösungen". Zeitschrift fuer Physikalische Chemie 94, 129-168 (1917). [82] KC, R. "Phase transformations". in American Society for Metals 219-268 (1968). [83] Kind, M. & Mersmann, A. "Methode zur Berechnung der homogenen Keimbildung aus

wässerigen Lösungen". Chemie Ingenieur Technik 55, 720-721 (1983). [84] Mersmann, A. "Crystallization and precipitation". Chemical Engineering and Processing: Process

111 references, page 1 of 8
Abstract
Control of catalyst supports porosity is an important challenge for the refining industry. The aim of this thesis is to develop a new precipitation process in order to obtain γ-alumina supports exhibiting new textural properties compared with those prepared by the conventional boehmite precipitation route in stirred tank reactor. For that purpose, combined influences of precursor, mixing technology and micromixing time on the final product physical properties were studied.Three mixing technologies were compared: a classic stirred tank reactor, a sliding surface mixing device and a rotor-stator mixer. Micromixing time ranges achievable with each of these reactors...
Subjects
free text keywords: Boehmite, Precipitation, Mélangeur rapide, Alumina, Dawsonite, Micromélange, Sursaturation, Alumine, Micromixing, [CHIM.GENI]Chemical Sciences/Chemical engineering, Supersaturation, Fast contacting mixers
111 references, page 1 of 8

III.5.1.2 Bilan de matière dans les agrégats basiques ................................................................. 141

III.5.2 RESULTATS ET DISCUSSION.................................................................................................. 143

III.5.2.1 Influence de la solubilité sur la fréquence de nucléation .............................................. 143

III.5.2.2 Modélisation de l'évolution de la sursaturation avec le temps de micromélange ......... 144

III.5.2.3 Modélisation de l'influence de la viscosité .................................................................. 147

III.5.3 LIMITES DU MODELE ............................................................................................................ 148

III.5.4 BILAN................................................................................................................................... 149

III.6 CONCLUSIONS ...................................................................................................................... 149

CONTINU ........................................................................................................................193

CONCLUSION GENERALE ET PERSPECTIVES ..................................................235 [78] Turnbull, D. & Fisher, J. C. "Rate of Nucleation in Condensed Systems". The Journal of Chemical

Physics 17, 71-73 (1949). [79] Becker, R. & Döring, W. "Kinetische Behandlung der Keimbildung in übersättigten Dämpfen".

Annalen der Physik 416, 719-752 (1935). [80] Zeldovich, Y. B. Selected Works of Yakov Borisovich Zeldovich. (Princeton University Press,

1992). [81] Smoluchowski, M. "Versuch einer mathematischen theorie der koagulationskinetik kolloider

Lösungen". Zeitschrift fuer Physikalische Chemie 94, 129-168 (1917). [82] KC, R. "Phase transformations". in American Society for Metals 219-268 (1968). [83] Kind, M. & Mersmann, A. "Methode zur Berechnung der homogenen Keimbildung aus

wässerigen Lösungen". Chemie Ingenieur Technik 55, 720-721 (1983). [84] Mersmann, A. "Crystallization and precipitation". Chemical Engineering and Processing: Process

111 references, page 1 of 8
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publication . Doctoral thesis . 2016

Nouveau procédé de précipitation pour la synthèse d’alumine

Lafficher, Robin;