Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Morphological Change of Precipitated Calcium Carbonate by Reaction Rate in Bubble Column Reactor

기포탑 반응기에서 반응 속도에 따른 침강성 탄산칼슘의 모폴로지 변화

  • Hwang, Jung Woo (Department of Chemical Engineering, Sungkyunkwan University) ;
  • Lee, Yoong (Department of Chemical Engineering, Dankook University) ;
  • Lee, Dong Hyun (Department of Chemical Engineering, Sungkyunkwan University)
  • 황정우 (성균관대학교 화학공학과) ;
  • 이융 (단국대학교 화학공학과) ;
  • 이동현 (성균관대학교 화학공학과)
  • Received : 2009.08.19
  • Accepted : 2009.09.17
  • Published : 2009.12.31
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Abstract

Effects of $Ca(OH)_2$ concentration(0.16~0.64 wt%), total volumetric flow rate(3~6 L/min) and $CO_2$ volume fraction(0.3~0.6) on morphology of the precipitated $CaCO_3$ and the mean particle size of the precipitated $CaCO_3$ were investigated in the slurry bubble column reactor. Experiments were carried out in acrylic reactor($0.11m-ID{\times}1.0m-high$) with a internal tube($0.04m-ID{\times}1.0m-high$). The calibration curve on the mass ratio of $CaCO_3$ to $Ca(OH)_2$ was obtained by FT-IR for the conversion of $Ca(OH)_2$ with the reaction time. The reaction rate of $Ca(OH)_2$ increased with increasing the volumetric flow rate of $CO_2$. From SEM images, the crystal size of $CaCO_3$ increased with increasing the reaction rate in the saturated concentration of $Ca(OH)_2$ (0.16 wt%). In addition, the crystal size of precipitated $CaCO_3$ decreased with increasing the concentration of $Ca(OH)_2$, but the mean particle size of precipitated $CaCO_3$ increased with increasing the concentration of $Ca(OH)_2$.

슬러리 기포탑에서 침강성 탄산칼슘의 평균입도와 모폴로지의 변화에 대한 수산화칼슘의 농도(0.16~0.64 wt%), 총 부피유량(3~6 L/min) 및 이산화탄소의 부피분율(0.3~0.6)의 영향을 나타내었다. 실험에 사용한 반응기는 높이가 1.0 m, 직경이 0.11 m이고 중앙에는 직경 4 cm인 튜브가 들어있는 슬러리 기포탑이다. 반응 시간에 따른 수산화칼슘의 전화율을 구하기 위해 FT-IR을 이용하여 수산화칼슘과 탄산칼슘 함량비에 따른 검량곡선을 구하였다. 수산칼슘의 포화농도인 0.16 wt%에서 이산화탄소의 유량에 따른 침강성 탄산칼슘의 모폴로지를 살펴보면 반응 속도가 증가할수록 결정 크기는 증가하는 경향을 보이며 결정의 형태는 단일 결정으로 존재하는 입자들이 많아졌다. 또한 수산화칼슘의 농도가 증가할수록 결정 크기는 감소하지만 입자들간의 응집에 의해 탄산칼슘의 평균 입도는 증가하는 것을 확인하였다.

Keywords

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