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한명완 ( Myung Wan Han ),강경석 ( Kyung Suk Kang ),송재경 ( Jae Kyung Song ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.2
본 논문에서는 PET를 재활용하는 최근의 기술들을 소개한다. PET가 광범위하게 사용되고 또한 썩지 않기 때문에 환경 문제를 야기하고 또한 이 물질의 폐기 및 소각은 경제적 손실이기도 하다. PET의 화학적 재활용은 이 폐기물들을 유용한 원료물질로 전환하여 PET를 재생산하는 것이 가능하게 한다. PET의 화학적 재활용은 글리콜에 의한 글리콜리시스, 메탄올에 의한 메탄올리시스, 물에 의한 가수분해 등의 반응에 의한 PET 고분자 사슬의 분해가 이루어지고, 분리정제 과정을 거쳐 MEG, DMT, PTA와 같은 단량체 혹은 폴리에스터 올리고머로 만들어진다. 이 물질들은 폴리에스터를 합성하는 데 사용될 수 있다. This paper reviews recent technologies for recycling poly (ethylene terephthalate) wastes. Wide application and non-biodegradability of the PET creates huge amounts of waste and disposal, leading to an environmental problem and economic loss. Chemical recycling can be a promising technology to deal with these problems by converting the waste into useful feedstock material for polyester production. Chemical recycling of polyethylene terephthalate are processes where the PET polymer chain is destructed by the impact of glycol (MEG) causing glycolysis, methanol causing methanolysis or water causing hydrolysis. After intensive purification polyester oligomers or the monomers MEG, dimethyl telephthalate (DMT) or purified terephthalic acid (PTA) are received which are re-used to produce polyester products.
보문 : 재료(유/무기,전자,반도체),고분자,나노기술,반도체기술,마이크로반응기 ; Dimethyl terephthalate와 ethylene glycol의 에스테르 교환 반응
한명완 ( Myung Wan Han ),이진홍 ( Jin Hong Lee ),조임표 ( Im Pyo Cho ),조상환 ( San Hwan Jo ),조민정 ( Min Jung Cho ),강경석 ( Kyung Suk Kang ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
본 연구에서는 촉매로 zinc acetate를 사용하였고 dimethyl terephthalate(DMT)와 ethylene glycol(EG)의 에스테르 교 환을 통하여 polyethylene terephthalate(PET)의 단량체인 bishydroxyethyl terephthalate(BHET)를 생성하는 반응에 대 하여 알아보았다. 기존의 kinetics 연구는 에스테르 교환 반응에서 생성되는 메탄올이 반응계에서 제거되는 반회분식 공정을 바탕으로 하여 이때 제거된 메탄올 양을 측정하여 역반응이 무시된 반응 kinetics 모델을 구성하였다. 본 연구 에서는 회분식 반응기를 통하여 DMT와 메탄올의 양을 정량하여, 역반응을 고려한 보다 정확한 kinetics 모델을 제안 하였고, 제안된 모델의 예측값들이 실험값들과 잘 일치하는 것을 보였다. 또한 모델과 실험값을 분석하여 여러 공정 변 수들이 에스테르 교환 반응에 미치는 영향을 조사하였다. The kinetics of the transesterification of dimethyl terephthalate (DMT) with ethylene glycol (EG) was studied in a batch reactor. Bishydroxyethyl terephthalate (BHET), which is poly(ethylene terephthalate) (PET) monomer, can be produced by the transesterification reaction. Zinc acetate was used as a catalyst. Previous kinetic studies was carried out in a semi-batch reactor where generated methanol was removed so that reverse reactions were not considered in the kinetic expressions, resulting in inaccuracy of the kinetic model. Mathematical models of a batch reactor for the tranesterification reaction were developed and used to characterize the reaction kinetics and the composition distribution of the reaction products. More accurate models than previous ones were obtained and found to have a good agreement between model predictions and experimental data. Effect of process variables on the esterification reaction was investigated based on the experimental and simulation results.
디메틸테레프탈레이트와 1,4-부탄디올의 에스테르교환 반응 특성
한명완 ( Myung Wan Han ),조임표 ( Im Pyo Cho ),이진홍 ( Jin Hong Lee ),조상환 ( San Hwan Jo ),조민정 ( Min Jung Cho ),강경석 ( Kyung Suk Kang ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
PBT (polybutylene terephthalate) has excellent mechanical properties such as low absorption, dimensional stability, abrasion resistance. It is used in manufacturing electronic components, the automobile part and the various precise parts. Bis (hydroxybutyl) terephthalate (BHBT) which is a PBT monomer, can be produced by transesterification reaction of DMT (dimethyl terephthalate) with 1,4-butandiol (BD). The kinetics of transesterification reaction of DMT with BD using zinc acetate as a catalyst was studied in a batch reactor. Previous kinetic studies was carried out in a semibatch reactor where generated methanol was removed so that reverse reactions were not considered in the kinetic expressions, resulting in inaccuracy of the kinetic model. Mathematical models of a batch reactor for the transesterification reaction were developed and used to characterize the reaction kinetics and the composition distribution of the reaction products. More accurate models than previous models was obtained and found to have a good agreement between model predictions and experimental data.