Journal
AICHE JOURNAL
Volume 61, Issue 12, Pages 4387-4401Publisher
WILEY
DOI: 10.1002/aic.14952
Keywords
hydrates; mixing; crystal growth (industrial crystallization); mathematical modeling; heat transfer
Categories
Funding
- National Sciences and Engineering Research Council of Canada (NSERC)
- Federation Wallonia-Brussels (FW-B)
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CO2 hydrate formation experiments are performed in a 20L 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 CO2 hydrate formation rate. An original mathematical model of the CO2 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. (c) 2015 American Institute of Chemical Engineers
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