http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조훈 ( Hoon Cho ),최유미 ( Yu Mi Choi ),이진홍 ( Jin Hong Lee ),조임표 ( Im Pyo Cho ),한명완 ( Myung Wan Han ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
Extractive distillation system can be used when the components to be separated have close boiling points or form azeotropes. Extractive distillation is one of the most important and widely used separation methods in chemical process industry. The main disadvantage of the distillation is its high-energy requirements. Thermally coupled distillation system (TCDS) can provide significant savings in energy consumption and capital cost over the operation of sequences based on conventional distillation column. Despite such advantages of the thermally coupled distillation system, the process is not widely used in industry because control and operation of the column are difficult. In this study, we propose several control schemes for thermally coupled distillation system to overcome the difficulties and make the column stable when the process is confronted with feed disturbances. Profile position control scheme shows best control performance among the proposed control schemes.
디메틸 카보네이트(DMC)로부터 디페닐카보네이트(DPC) 합성을 위한 반응속도론
최유미 ( Yu Mi Choi ),조임표 ( Im Pyo Cho ),조훈 ( Hoon Cho ),이진홍 ( Jin Hong Lee ),한명완 ( Myung Wan Han ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
PC (polycarbonate) is one of the widely used engineering plastics. Polycarbonate (PC) is traditionally produced by the reaction of phosgene and bisphenol-A. This phosgene process has the disadvantage as the high toxicity and corrosiveness of phosgene. The main point of focus to overcome the disadvantage of phosgene based process has been a route through dimethyl carbonate (DMC) to diphenyl carbonate (DPC), In this paper, for the DPC synthesis reaction using PBO as a catalyst, the effect of reaction temperature, reactant ratio, catalyst concentration on the reaction yield was investigated. A kinetic model for the DPC synthesis reaction was proposed and kinetic parameters for the proposed model was determined from batch reactor experiments. The predicted results by the proposed model were in good agreement with the experimental 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.
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.