Influence of mixing performance on polymerization of acrylamide in capillary microreactors

Nonliving free radical polymerization of acrylamide was chosen as a model reaction to investigate the effect of mixing performance on the polymerization in capillary microreactors. The polymerization rate was enhanced by increasing the volumetric flow rate and the reaction temperature at a constant...

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Veröffentlicht in:AIChE journal 2018-05, Vol.64 (5), p.1828-1840
Hauptverfasser: Song, Yang, Shang, Minjing, Li, Guangxiao, Luo, Zheng‐Hong, Su, Yuanhai
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container_end_page 1840
container_issue 5
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container_title AIChE journal
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creator Song, Yang
Shang, Minjing
Li, Guangxiao
Luo, Zheng‐Hong
Su, Yuanhai
description Nonliving free radical polymerization of acrylamide was chosen as a model reaction to investigate the effect of mixing performance on the polymerization in capillary microreactors. The polymerization rate was enhanced by increasing the volumetric flow rate and the reaction temperature at a constant residence time. However, higher temperatures led to lower Mn and larger PDI. The reaction mixture viscosity increased significantly during the polymerization. Both diffusion and dispersion coefficients were calculated to evaluate the mixing performance in microreactors. The capillary microreactor with a larger inner diameter led to higher monomer conversions, lower Mn and larger PDI compared to the capillary microreactor with a smaller inner diameter, which could be explained through a heat balance analysis for the polymerization and the dispersion effect. Moreover, it was found that the addition of a pre‐mixing stage minimized the effect of insufficient mixing between the initiators and the monomers on the polymerization. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1828–1840, 2018
doi_str_mv 10.1002/aic.16046
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subjects Acrylamide
diffusion
Dispersion
Flow rates
Flow velocity
Free radical polymerization
Free radicals
Heat balance
Initiators
microreactor
Microreactors
mixing
Monomers
Polymerization
Viscosity
title Influence of mixing performance on polymerization of acrylamide in capillary microreactors
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