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Impact of the fluid flow conditions on the formation rate of carbon dioxide hydrates in a semi‐batch stirred tank reactor
Author(s) -
Douïeb S.,
Fradette L.,
Bertrand F.,
Haut B.
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14952
Subject(s) - impeller , continuous stirred tank reactor , volumetric flow rate , limiting , rotational speed , mechanics , hydrate , turbine , flow (mathematics) , thermodynamics , heat transfer , chemistry , fluid dynamics , carbon dioxide , materials science , chemical engineering , mechanical engineering , engineering , physics , organic chemistry
CO 2 hydrate formation experiments are performed in a 20 L semi‐batch stirred tank reactor using three different impellers (a down‐pumping pitched blade turbine, a Maxblend™, and a Dispersimax™) at various rotational speeds to examine the impact of the flow conditions on the CO 2 hydrate formation rate. An original mathematical model of the CO 2 hydrate formation process that assigns a resistance to each of its constitutive steps is established. For each experimental condition, the formation rate is measured and the rate‐limiting step is determined on the basis of the respective values of the resistances. The efficiencies of the three considered impellers are compared and, for each impeller, the influence of the rotational speed on the rate‐limiting step is discussed. For instance, it is shown that a formation rate limitation due to heat transfer can occur at the relatively small scale used to perform our experiments. © 2015 American Institute of Chemical Engineers AIChE J , 61: 4387–4401, 2015