TITLE

Lipase-catalyzed Continuous Ring-opening Polymerization of 8-Caprolactone in a Packed-bed Reactor

AUTHOR(S)
Zhang, M. J.; Su, E. Z.; Lin, J. P.; Wei, D. Z.
PUB. DATE
March 2012
SOURCE
Chemical & Biochemical Engineering Quarterly;Mar2012, Vol. 26 Issue 1, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A packed-bed reactor (PBR) system was developed for continuous lipas&egr;-catalyzed ring-opening polymerization of &egr;-caprolactone (&egr;-CL). The parameters affecting the poly(&egr;-caprolactone) (PCL) production in the PBR such as residence time, height to diameter {HID) ratio, and monomer feed concentration were investigated. Monomer conversion of &egr;-CL increased with the increase of residence time, reached the highest (over 98 %) at the residence time of 12 min. And under this residence time it would almost not change even if the H/D ratio varied from 4 to 20 or the monomer concentration varied from 0.2 to 2.25 mol L-1. The number-average molecular mass (Mn) of PCL did not change in agreement with the monomer conversion, and approached the maximal values of 15600 g moL1 with polydispersity index (PDI) of 2.1 under 20 min residence time, 12.0 HID ratio and 1.75 mol L-1 monomer concentration. The Mn of PCL maintained around 15600 g moL-1 without appreciable loss during the long-term operation of 460 h with the PCL productivity of 19.15 g g-1 enzyme d-1).
ACCESSION #
75653460

 

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