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http://dx.doi.org/10.9713/kcer.2016.54.4.437

Production of PBT(polybutylene terephthalate) Oligomer from Recycled PET(polyethylene terephthalate)  

Cho, Minjeong (Department of Chemical Engineering, Chungnam National University)
Yang, Jeongin (Department of Chemical Engineering, Chungnam National University)
Noh, Seunghyun (Department of Chemical Engineering, Chungnam National University)
Joe, Hongjae (Department of Chemical Engineering, Chungnam National University)
Han, Myungwan (Department of Chemical Engineering, Chungnam National University)
Publication Information
Korean Chemical Engineering Research / v.54, no.4, 2016 , pp. 437-442 More about this Journal
Abstract
A new route for PBT (Poly butylene terephthalate) production from recycled PET (Poly ethylene terephthalate) has been explored. The route consists of glycolysis of PET (Poly ethylene terephthalate) wastes using 1,4-butandiol into BHBT oligomers and polycondensation of the oligomers into PBT oligomer. This process uses post-consumer or post-industrial recycled PET and converts it into high-end PBT type engineering thermoplastic via a chemical recycling process. Zink acetate was used as a catalyst for both glycolysis and polycondensation. Two types of reactor for the glycolysis, batch and semi-batch reactor, were investigated and their performances were compared. Semi-batch reactor removes ethylene glycol (EG) and THF (tetrahydrofuran) during the reaction. Amounts of EG and THF generated during the glycolysis reaction were measured and used as criteria for the reactor performance. Performance of semi-batch reactor was shown to be better than that of batch reactor. Optimum reaction condition for the semi-batch reactor was BD/PET ratio of 4, and reaction temperature of $220^{\circ}C$, giving high EG yield (max 91%) and low production of THF. In addition, it was confirmed that the molecular weight of PBT oligomer increases in accordance with the progress of the polycondensation reaction.
Keywords
PET; Recycle; BHBT; PBT; Transesterification; Polymerization;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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