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MSMPR 반응기와 쿠에트-테일러 반응기에서 기-액 반응성 탄산칼슘 결정화

Gas-Liquid Reaction Precipitation of Calcium Carbonate in MSMPR and Couette-Taylor Reactors

이상구 정왕모¹ 김우식^2† 최창균¹

Sang Goo Lee Wang Mo Jung¹ Woo-Sik Kim^2† Chang Kyun Choi¹

(주)한화, 인천 405-310 ¹서울대학교 공과대학 응용화학부, 서울 151-742 ²경희대학교 공과대학 화학공학과, 수원 449-701

Hanhwa Ltd., Inchon 405-310, Korea ¹School of Chemical Engineering, College of Engineering, Seoul National University, Seoul 151-742, Korea ²Department of Chemical Engineering, Institute of Materials Science & Technology, Kyunghee University, Suwon 449-701, Korea

HWAHAK KONGHAK, February 2000, 38(1), 67-74(8)
https://doi.org/NONE

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Abstract

Rushton형 MSMPR 반응기와 쿠에트-테일러 반응기에서 이산화탄소가 수산화칼슘의 기-액 반응에 의해 생성되는 탄산칼슘 결정화에 대해 체류시간, 교반속도, 계면활성제의 종류와 같은 조업변수가 미치는 영향에 대해 실험적으로 연구하였다. 온도와 농도가 일정한 MSMPR 반응기에서는 계면활성제의 종류가 평균 입자크기에 가장 큰 영향을 미치는 것으로 나타났고, 이를 평균 제타전위로 수치화하였다. 교반속도의 증가에 따른 평균 입자크기는 물질전달 저항의 감소로 인해 증가하였다. 쿠에트-테일러 반응기에서의 와류 흐름의 효과는 기-액 반응성 탄산칼슘 결정화에 대해 독특한 특성을 나타내었다. 쿠에트-테일러 반응기에서는 와류에 의해 균일한 혼합조건을 얻을 수 있었고, 이로 인해 MSMPR 반응기의 경우보다 입자의 크기분포가 매우 균일하게 나타났다.

The effect of the operating variables such as mean residence time, agitational speed and surfactant type, on the precipitation of calcium carbonate was experimentally investigated in MSMPR and Couette-Taylor reactors. The precipitates was produced by the gas-liquid reaction of CO₂ gas and Ca(OH)₂ aqueous solution. Under-fixed temperature and concentration in MSMPR reactor, it was founded that the surfactant type had the greatest influence on the mean particle size and this effect was represented numerically by the zeta potential. With increasing the impeller speed the mean particle size increased due to decrease of the resistance in mass transfer processes. The vortex flow in Couette-Taylor reactor affected the precipitation of calcium carbonate complicatedly. The homogeneous mixing owing to Taylor vortex in Couette-Taylor reactor led to the more uniform particle size distribution than that in MSMPR reactor.

Keywords

Calcium Carbonate Couette-Taylor Reactor Gas-liquid Reaction Precipitation MSMPR Reactor Rhombohedral Calcite Surfactant

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