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슬러리 반응기에서 액상 디메틸에테르 합성의 물질 전달 해석
Analysis of Mass Transfer in a Slurry Reactor for Dimethyl Ether Synthesis
한국에너지기술연구원 대체에너지연구부, 대전 305-343 1고려대학교 공과대학 화학공학과, 서울 136-701
New & Renewable Energy Research Department, Korea Institute of Energy Research, Daejeon 305-343, Korea 1Dept. of Chemical Engineering, Korea University, Seoul 136-701, Korea
kimsh@mail.korea.ac.kr
HWAHAK KONGHAK, December 2001, 39(6), 750-756(7), NONE
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Abstract
디메틸에테르 액상 합성 공정의 물질 전달 특성을 물리적으로 교반되고 있는 슬러리 반응기에서 실험적으로 고찰하였다. 액상 합성 공정의 상용화를 위해 규모확대에 필요한 디메틸에테르 합성 공정의 물질전달 현상을 이해하고자, 100 μm이하 입자로 된 Cu-ZnO-Al2O3와 γ-alumina 촉매의 충전량을 변화시키면서 총괄 기-액 물질 전달 계수(KLi(a)B)에 대한 온도, 임펠러 속도, 가스 유속의 영향을 살펴보았다. 내부 물질 전달의 영향을 무시할 때, 다양한 실험조건 하에서 기-액 물질전달, 고-액 물질전달, 촉매 표면의 반응 속도 단계 중 공정 총괄 속도의 율속 단계는 슬러리 농도를 매우 작은 값에서 큰 값으로 변화시킴에 따라 달라질 수 있다. 슬러리 농도는 반응 공정의 경제적 효율 및 최적 생산성에 영향을 주는 주요 인자로 공정의 운전 목적에 따라 결정된다.
Mass transfer characteristics have been experimentally investigated for liquid phase synthesis of dimethyl ether using a slurry reactor with mechanical agitation. This investigation has been necessitated on clarifying the mass transfer phenomena in the liquid phase dimethyl ether process for the commercialization of the process. By varying loading amounts of Cu-ZnO-Al2O3 and γ-alumina, -100 μm in diameter, the effects of reaction temperature, impeller speed, and gas flow rate on the overall gas-liquid mass transfer coefficient(KLi(a)B) have been investigated. While ignoring the internal mass transfer resistance, the rate-controlling step of overall kinetic rate among gas-liquid mass transfer step, solid-film mass transfer step, and reaction rate step can be varied by changing the value of slurry ratio from very low to very high value. The slurry concentration is one of the most important process variables in the operation of a slurry reactor and it must be decided to get economical efficiency and optimum producitivity of the process.
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