Abstract
This study investigated the effect of dual impeller geometry on the droplet size in the suspension-PVC (S-PVC) polymerization process. To simulate the process, 1,2-dichloroethane was used as a dispersed phase, because it has been used to replace the toxic vinyl chloride monomer (VCM). Using a borescope method, a droplet size was measured for a biphasic liquid system, and the Sauter mean diameter increased by 46.5% as the upper paddle impeller was replaced by 20° pitched paddle. It also increased when the impeller diameter and the blade width increased. Considering this effect, a geometrical factor (F) was revised, and a calculated maximum energy dissipation rate was used for establishing the Sauter mean diameter correlation. The proposed correlation can estimate the Sauter mean diameter within ±20% error, and one can predict the normality of the polymerization under specific impeller geometry using this correlation.
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Abbreviations
- C:
-
constants (i= 1–4)
- D:
-
tank diameter [m]
- DI :
-
impeller diameter [m]
- di :
-
droplet diameter [m]
- d32 :
-
Sautermean diameter[m]
- F:
-
geometrical factor [-]
- H:
-
filling height of the stirred tank reactor [m]
- H I :
-
vertical impeller height [m]
- M:
-
torque of the impeller [N m]
- N:
-
impeller speed [s−1]
- NB :
-
number of impeller blades [-]
- NI :
-
number of impellers [-]
- ni :
-
number of droplets
- P:
-
power consumption [W]
- t:
-
time [s]
- \({1 \over {{{\rm{t}}_c}}}\) :
-
circulation frequency [s−1]
- \({1 \over {{{\rm{t}}_{c\_l}}}}\) :
-
circulation frequency of lower impeller [s−1]
- \({1 \over {{{\rm{t}}_{c\_u}}}}\) :
-
circulation frequency of upper impeller [s−1]
- V:
-
filling volume of the stirred tank reactor [m3]
- W:
-
impeller blade width [m]
- \({\bar \varepsilon}\) :
-
mean specific energy dissipation rate [W kg−1]
- ε max :
-
maximum energy dissipation rate [W kg−1]
- θ :
-
impeller blade angle of the upper impeller [°]
- ρ :
-
density [kg m−3]
- σ :
-
surface tension [mN m−1]
- l:
-
lower impeller
- u:
-
upper impeller
- Fl:
-
impeller flow number
- Ne:
-
impeller power number
- We I :
-
impeller Weber number, \({{{{\rm{N}}^2}{{\rm{D}}^3}\rho} \over \sigma}\)
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Acknowledgement
This work was supported by the ERC Center funded by the National Research Foundation of Korea (NRF-2022R1A5A1033719).
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Droplet size distribution in a biphasic liquid reactor for understanding the impact of various dual impeller designs on the morphology of S-PVC
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Park, J., Lee, W. & Lee, J.W. Droplet size distribution in a biphasic liquid reactor for understanding the impact of various dual impeller designs on the morphology of S-PVC. Korean J. Chem. Eng. 40, 46–56 (2023). https://doi.org/10.1007/s11814-022-1252-7
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DOI: https://doi.org/10.1007/s11814-022-1252-7