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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 11, 2015
Accepted April 10, 2016

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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재활용 PET(polyethylene terephthalate)를 이용한 PBT(polybutylene terephthalate) 올리고머 제조

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

조민정 양정인 노승현 조홍제 한명완^†

Minjeong Cho Jeongin Yang Seunghyun Noh Hongjae Joe Myungwan Han^†

충남대학교 공과대학 화학공학과, 34134 대전광역시 유성구 대학로 99

Department of Chemical Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Korea

mwhan@cnu.ac.kr

Korean Chemical Engineering Research, August 2016, 54(4), 437-442(6), 10.9713/kcer.2016.54.4.437 Epub 2 August 2016

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Abstract

재활용 PET (Poly ethylene terephthalate)로부터 PBT (Poly butylene terephthalate)를 생산할 수 있는 새로운 방법을 모색하였다. 이 방법은 PET와 BD (1,4-butanediol)의 에스테르 교환반응을 통하여 BHBT (Bishydroxybutylterephthalate)올리고머를 생성하는 글리콜리시스 반응과 BHBT의 축합 중합 반응을 통하여 PBT 올리고머를 생성하는 축중합 반응으로 이루어져 있다. 이를 통해 단기 수명 주기 제품인 버려지는 PET 페자원을 장기 수명 주기 제품인 PBT로 변환시켜 더 가치 있고 바람직한 재활용을 하고자 하였다. 본 연구에서는 글리콜리시스와 축중합 촉매로 zinc acetate를 사용하였고, 글리콜리시스 반응에 대하여 회분식 반응기와 반 회분식 반응기를 적용하여 성능을 비교하였다. 이를 위하여 생성되는 에틸렌글리콜(EG)의 양을 정량하여 해중합도를 추정할 수 있는 EG 수율과 부산물인 THF 생성량을 성능 척도로 하였다. 반응 도중에 EG를 제거하는 반회분식 반응기의 성능이 회분식 반응기에 비하여 보다 우수한 것으로 나타났다. 또한 반회분식 반응기의 경우 최적의 반응조건은 BD/PET 비율 4, 반응온도 220 ℃ 이었으며, 최고 EG 수율은 91% 이었다. 또한 축 중합 반응이 진행됨에 따라 PBT 올리고머의 분자량이 증가하는 것을 보였다.

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 semibatch 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 ℃, 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

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